| /* |
| * Copyright (C)2009-2015, 2017, 2020-2023 D. R. Commander. |
| * All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * - Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * - Neither the name of the libjpeg-turbo Project nor the names of its |
| * contributors may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS", |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef __TURBOJPEG_H__ |
| #define __TURBOJPEG_H__ |
| |
| #include <stddef.h> |
| |
| #if defined(_WIN32) && defined(DLLDEFINE) |
| #define DLLEXPORT __declspec(dllexport) |
| #else |
| #define DLLEXPORT |
| #endif |
| #define DLLCALL |
| |
| |
| /** |
| * @addtogroup TurboJPEG |
| * TurboJPEG API. This API provides an interface for generating, decoding, and |
| * transforming planar YUV and JPEG images in memory. |
| * |
| * @anchor YUVnotes |
| * YUV Image Format Notes |
| * ---------------------- |
| * Technically, the JPEG format uses the YCbCr colorspace (which is technically |
| * not a colorspace but a color transform), but per the convention of the |
| * digital video community, the TurboJPEG API uses "YUV" to refer to an image |
| * format consisting of Y, Cb, and Cr image planes. |
| * |
| * Each plane is simply a 2D array of bytes, each byte representing the value |
| * of one of the components (Y, Cb, or Cr) at a particular location in the |
| * image. The width and height of each plane are determined by the image |
| * width, height, and level of chrominance subsampling. The luminance plane |
| * width is the image width padded to the nearest multiple of the horizontal |
| * subsampling factor (1 in the case of 4:4:4, grayscale, or 4:4:0; 2 in the |
| * case of 4:2:2 or 4:2:0; 4 in the case of 4:1:1.) Similarly, the luminance |
| * plane height is the image height padded to the nearest multiple of the |
| * vertical subsampling factor (1 in the case of 4:4:4, 4:2:2, grayscale, or |
| * 4:1:1; 2 in the case of 4:2:0 or 4:4:0.) This is irrespective of any |
| * additional padding that may be specified as an argument to the various YUV |
| * functions. The chrominance plane width is equal to the luminance plane |
| * width divided by the horizontal subsampling factor, and the chrominance |
| * plane height is equal to the luminance plane height divided by the vertical |
| * subsampling factor. |
| * |
| * For example, if the source image is 35 x 35 pixels and 4:2:2 subsampling is |
| * used, then the luminance plane would be 36 x 35 bytes, and each of the |
| * chrominance planes would be 18 x 35 bytes. If you specify a row alignment |
| * of 4 bytes on top of this, then the luminance plane would be 36 x 35 bytes, |
| * and each of the chrominance planes would be 20 x 35 bytes. |
| * |
| * @{ |
| */ |
| |
| |
| /** |
| * The number of initialization options |
| */ |
| #define TJ_NUMINIT 3 |
| |
| /** |
| * Initialization options. |
| */ |
| enum TJINIT { |
| /** |
| * Initialize the TurboJPEG instance for compression. |
| */ |
| TJINIT_COMPRESS, |
| /** |
| * Initialize the TurboJPEG instance for decompression. |
| */ |
| TJINIT_DECOMPRESS, |
| /** |
| * Initialize the TurboJPEG instance for lossless transformation (both |
| * compression and decompression.) |
| */ |
| TJINIT_TRANSFORM |
| }; |
| |
| |
| /** |
| * The number of chrominance subsampling options |
| */ |
| #define TJ_NUMSAMP 6 |
| |
| /** |
| * Chrominance subsampling options. |
| * When pixels are converted from RGB to YCbCr (see #TJCS_YCbCr) or from CMYK |
| * to YCCK (see #TJCS_YCCK) as part of the JPEG compression process, some of |
| * the Cb and Cr (chrominance) components can be discarded or averaged together |
| * to produce a smaller image with little perceptible loss of image clarity. |
| * (The human eye is more sensitive to small changes in brightness than to |
| * small changes in color.) This is called "chrominance subsampling". |
| */ |
| enum TJSAMP { |
| /** |
| * 4:4:4 chrominance subsampling (no chrominance subsampling). The JPEG or |
| * YUV image will contain one chrominance component for every pixel in the |
| * source image. |
| */ |
| TJSAMP_444, |
| /** |
| * 4:2:2 chrominance subsampling. The JPEG or YUV image will contain one |
| * chrominance component for every 2x1 block of pixels in the source image. |
| */ |
| TJSAMP_422, |
| /** |
| * 4:2:0 chrominance subsampling. The JPEG or YUV image will contain one |
| * chrominance component for every 2x2 block of pixels in the source image. |
| */ |
| TJSAMP_420, |
| /** |
| * Grayscale. The JPEG or YUV image will contain no chrominance components. |
| */ |
| TJSAMP_GRAY, |
| /** |
| * 4:4:0 chrominance subsampling. The JPEG or YUV image will contain one |
| * chrominance component for every 1x2 block of pixels in the source image. |
| * |
| * @note 4:4:0 subsampling is not fully accelerated in libjpeg-turbo. |
| */ |
| TJSAMP_440, |
| /** |
| * 4:1:1 chrominance subsampling. The JPEG or YUV image will contain one |
| * chrominance component for every 4x1 block of pixels in the source image. |
| * JPEG images compressed with 4:1:1 subsampling will be almost exactly the |
| * same size as those compressed with 4:2:0 subsampling, and in the |
| * aggregate, both subsampling methods produce approximately the same |
| * perceptual quality. However, 4:1:1 is better able to reproduce sharp |
| * horizontal features. |
| * |
| * @note 4:1:1 subsampling is not fully accelerated in libjpeg-turbo. |
| */ |
| TJSAMP_411, |
| /** |
| * Unknown subsampling. The JPEG image uses an unusual type of chrominance |
| * subsampling. Such images can be decompressed into packed-pixel images, |
| * but they cannot be |
| * - decompressed into planar YUV images, |
| * - losslessly transformed if #TJXOPT_CROP is specified, or |
| * - partially decompressed using a cropping region. |
| */ |
| TJSAMP_UNKNOWN = -1 |
| }; |
| |
| /** |
| * MCU block width (in pixels) for a given level of chrominance subsampling. |
| * MCU block sizes: |
| * - 8x8 for no subsampling or grayscale |
| * - 16x8 for 4:2:2 |
| * - 8x16 for 4:4:0 |
| * - 16x16 for 4:2:0 |
| * - 32x8 for 4:1:1 |
| */ |
| static const int tjMCUWidth[TJ_NUMSAMP] = { 8, 16, 16, 8, 8, 32 }; |
| |
| /** |
| * MCU block height (in pixels) for a given level of chrominance subsampling. |
| * MCU block sizes: |
| * - 8x8 for no subsampling or grayscale |
| * - 16x8 for 4:2:2 |
| * - 8x16 for 4:4:0 |
| * - 16x16 for 4:2:0 |
| * - 32x8 for 4:1:1 |
| */ |
| static const int tjMCUHeight[TJ_NUMSAMP] = { 8, 8, 16, 8, 16, 8 }; |
| |
| |
| /** |
| * The number of pixel formats |
| */ |
| #define TJ_NUMPF 12 |
| |
| /** |
| * Pixel formats |
| */ |
| enum TJPF { |
| /** |
| * RGB pixel format. The red, green, and blue components in the image are |
| * stored in 3-sample pixels in the order R, G, B from lowest to highest |
| * memory address within each pixel. |
| */ |
| TJPF_RGB, |
| /** |
| * BGR pixel format. The red, green, and blue components in the image are |
| * stored in 3-sample pixels in the order B, G, R from lowest to highest |
| * memory address within each pixel. |
| */ |
| TJPF_BGR, |
| /** |
| * RGBX pixel format. The red, green, and blue components in the image are |
| * stored in 4-sample pixels in the order R, G, B from lowest to highest |
| * memory address within each pixel. The X component is ignored when |
| * compressing and undefined when decompressing. |
| */ |
| TJPF_RGBX, |
| /** |
| * BGRX pixel format. The red, green, and blue components in the image are |
| * stored in 4-sample pixels in the order B, G, R from lowest to highest |
| * memory address within each pixel. The X component is ignored when |
| * compressing and undefined when decompressing. |
| */ |
| TJPF_BGRX, |
| /** |
| * XBGR pixel format. The red, green, and blue components in the image are |
| * stored in 4-sample pixels in the order R, G, B from highest to lowest |
| * memory address within each pixel. The X component is ignored when |
| * compressing and undefined when decompressing. |
| */ |
| TJPF_XBGR, |
| /** |
| * XRGB pixel format. The red, green, and blue components in the image are |
| * stored in 4-sample pixels in the order B, G, R from highest to lowest |
| * memory address within each pixel. The X component is ignored when |
| * compressing and undefined when decompressing. |
| */ |
| TJPF_XRGB, |
| /** |
| * Grayscale pixel format. Each 1-sample pixel represents a luminance |
| * (brightness) level from 0 to the maximum sample value (255 for 8-bit |
| * samples, 4095 for 12-bit samples, and 65535 for 16-bit samples.) |
| */ |
| TJPF_GRAY, |
| /** |
| * RGBA pixel format. This is the same as @ref TJPF_RGBX, except that when |
| * decompressing, the X component is guaranteed to be equal to the maximum |
| * sample value, which can be interpreted as an opaque alpha channel. |
| */ |
| TJPF_RGBA, |
| /** |
| * BGRA pixel format. This is the same as @ref TJPF_BGRX, except that when |
| * decompressing, the X component is guaranteed to be equal to the maximum |
| * sample value, which can be interpreted as an opaque alpha channel. |
| */ |
| TJPF_BGRA, |
| /** |
| * ABGR pixel format. This is the same as @ref TJPF_XBGR, except that when |
| * decompressing, the X component is guaranteed to be equal to the maximum |
| * sample value, which can be interpreted as an opaque alpha channel. |
| */ |
| TJPF_ABGR, |
| /** |
| * ARGB pixel format. This is the same as @ref TJPF_XRGB, except that when |
| * decompressing, the X component is guaranteed to be equal to the maximum |
| * sample value, which can be interpreted as an opaque alpha channel. |
| */ |
| TJPF_ARGB, |
| /** |
| * CMYK pixel format. Unlike RGB, which is an additive color model used |
| * primarily for display, CMYK (Cyan/Magenta/Yellow/Key) is a subtractive |
| * color model used primarily for printing. In the CMYK color model, the |
| * value of each color component typically corresponds to an amount of cyan, |
| * magenta, yellow, or black ink that is applied to a white background. In |
| * order to convert between CMYK and RGB, it is necessary to use a color |
| * management system (CMS.) A CMS will attempt to map colors within the |
| * printer's gamut to perceptually similar colors in the display's gamut and |
| * vice versa, but the mapping is typically not 1:1 or reversible, nor can it |
| * be defined with a simple formula. Thus, such a conversion is out of scope |
| * for a codec library. However, the TurboJPEG API allows for compressing |
| * packed-pixel CMYK images into YCCK JPEG images (see #TJCS_YCCK) and |
| * decompressing YCCK JPEG images into packed-pixel CMYK images. |
| */ |
| TJPF_CMYK, |
| /** |
| * Unknown pixel format. Currently this is only used by #tj3LoadImage8(), |
| * #tj3LoadImage12(), and #tj3LoadImage16(). |
| */ |
| TJPF_UNKNOWN = -1 |
| }; |
| |
| /** |
| * Red offset (in samples) for a given pixel format. This specifies the number |
| * of samples that the red component is offset from the start of the pixel. |
| * For instance, if an 8-bit-per-component pixel of format TJPF_BGRX is stored |
| * in `unsigned char pixel[]`, then the red component will be |
| * `pixel[tjRedOffset[TJPF_BGRX]]`. This will be -1 if the pixel format does |
| * not have a red component. |
| */ |
| static const int tjRedOffset[TJ_NUMPF] = { |
| 0, 2, 0, 2, 3, 1, -1, 0, 2, 3, 1, -1 |
| }; |
| /** |
| * Green offset (in samples) for a given pixel format. This specifies the |
| * number of samples that the green component is offset from the start of the |
| * pixel. For instance, if an 8-bit-per-component pixel of format TJPF_BGRX is |
| * stored in `unsigned char pixel[]`, then the green component will be |
| * `pixel[tjGreenOffset[TJPF_BGRX]]`. This will be -1 if the pixel format does |
| * not have a green component. |
| */ |
| static const int tjGreenOffset[TJ_NUMPF] = { |
| 1, 1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1 |
| }; |
| /** |
| * Blue offset (in samples) for a given pixel format. This specifies the |
| * number of samples that the blue component is offset from the start of the |
| * pixel. For instance, if an 8-bit-per-component pixel of format TJPF_BGRX is |
| * stored in `unsigned char pixel[]`, then the blue component will be |
| * `pixel[tjBlueOffset[TJPF_BGRX]]`. This will be -1 if the pixel format does |
| * not have a blue component. |
| */ |
| static const int tjBlueOffset[TJ_NUMPF] = { |
| 2, 0, 2, 0, 1, 3, -1, 2, 0, 1, 3, -1 |
| }; |
| /** |
| * Alpha offset (in samples) for a given pixel format. This specifies the |
| * number of samples that the alpha component is offset from the start of the |
| * pixel. For instance, if an 8-bit-per-component pixel of format TJPF_BGRA is |
| * stored in `unsigned char pixel[]`, then the alpha component will be |
| * `pixel[tjAlphaOffset[TJPF_BGRA]]`. This will be -1 if the pixel format does |
| * not have an alpha component. |
| */ |
| static const int tjAlphaOffset[TJ_NUMPF] = { |
| -1, -1, -1, -1, -1, -1, -1, 3, 3, 0, 0, -1 |
| }; |
| /** |
| * Pixel size (in samples) for a given pixel format |
| */ |
| static const int tjPixelSize[TJ_NUMPF] = { |
| 3, 3, 4, 4, 4, 4, 1, 4, 4, 4, 4, 4 |
| }; |
| |
| |
| /** |
| * The number of JPEG colorspaces |
| */ |
| #define TJ_NUMCS 5 |
| |
| /** |
| * JPEG colorspaces |
| */ |
| enum TJCS { |
| /** |
| * RGB colorspace. When compressing the JPEG image, the R, G, and B |
| * components in the source image are reordered into image planes, but no |
| * colorspace conversion or subsampling is performed. RGB JPEG images can be |
| * compressed from and decompressed to packed-pixel images with any of the |
| * extended RGB or grayscale pixel formats, but they cannot be compressed |
| * from or decompressed to planar YUV images. |
| */ |
| TJCS_RGB, |
| /** |
| * YCbCr colorspace. YCbCr is not an absolute colorspace but rather a |
| * mathematical transformation of RGB designed solely for storage and |
| * transmission. YCbCr images must be converted to RGB before they can |
| * actually be displayed. In the YCbCr colorspace, the Y (luminance) |
| * component represents the black & white portion of the original image, and |
| * the Cb and Cr (chrominance) components represent the color portion of the |
| * original image. Originally, the analog equivalent of this transformation |
| * allowed the same signal to drive both black & white and color televisions, |
| * but JPEG images use YCbCr primarily because it allows the color data to be |
| * optionally subsampled for the purposes of reducing network or disk usage. |
| * YCbCr is the most common JPEG colorspace, and YCbCr JPEG images can be |
| * compressed from and decompressed to packed-pixel images with any of the |
| * extended RGB or grayscale pixel formats. YCbCr JPEG images can also be |
| * compressed from and decompressed to planar YUV images. |
| */ |
| TJCS_YCbCr, |
| /** |
| * Grayscale colorspace. The JPEG image retains only the luminance data (Y |
| * component), and any color data from the source image is discarded. |
| * Grayscale JPEG images can be compressed from and decompressed to |
| * packed-pixel images with any of the extended RGB or grayscale pixel |
| * formats, or they can be compressed from and decompressed to planar YUV |
| * images. |
| */ |
| TJCS_GRAY, |
| /** |
| * CMYK colorspace. When compressing the JPEG image, the C, M, Y, and K |
| * components in the source image are reordered into image planes, but no |
| * colorspace conversion or subsampling is performed. CMYK JPEG images can |
| * only be compressed from and decompressed to packed-pixel images with the |
| * CMYK pixel format. |
| */ |
| TJCS_CMYK, |
| /** |
| * YCCK colorspace. YCCK (AKA "YCbCrK") is not an absolute colorspace but |
| * rather a mathematical transformation of CMYK designed solely for storage |
| * and transmission. It is to CMYK as YCbCr is to RGB. CMYK pixels can be |
| * reversibly transformed into YCCK, and as with YCbCr, the chrominance |
| * components in the YCCK pixels can be subsampled without incurring major |
| * perceptual loss. YCCK JPEG images can only be compressed from and |
| * decompressed to packed-pixel images with the CMYK pixel format. |
| */ |
| TJCS_YCCK |
| }; |
| |
| |
| /** |
| * The number of parameters |
| */ |
| #define TJ_NUMPARAM |
| |
| /** |
| * Parameters |
| */ |
| enum TJPARAM { |
| #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION |
| TJPARAM_MAXPIXELS = -1, |
| #endif |
| /** |
| * Error handling behavior |
| * |
| * **Value** |
| * - `0` *[default]* Allow the current compression/decompression/transform |
| * operation to complete unless a fatal error is encountered. |
| * - `1` Immediately discontinue the current |
| * compression/decompression/transform operation if a warning (non-fatal |
| * error) occurs. |
| */ |
| TJPARAM_STOPONWARNING, |
| /** |
| * Row order in packed-pixel source/destination images |
| * |
| * **Value** |
| * - `0` *[default]* top-down (X11) order |
| * - `1` bottom-up (Windows, OpenGL) order |
| */ |
| TJPARAM_BOTTOMUP, |
| /** |
| * JPEG destination buffer (re)allocation [compression, lossless |
| * transformation] |
| * |
| * **Value** |
| * - `0` *[default]* Attempt to allocate or reallocate the JPEG destination |
| * buffer as needed. |
| * - `1` Generate an error if the JPEG destination buffer is invalid or too |
| * small. |
| */ |
| TJPARAM_NOREALLOC, |
| /** |
| * Perceptual quality of lossy JPEG images [compression only] |
| * |
| * **Value** |
| * - `1`-`100` (`1` = worst quality but best compression, `100` = best |
| * quality but worst compression) *[no default; must be explicitly |
| * specified]* |
| */ |
| TJPARAM_QUALITY, |
| /** |
| * Chrominance subsampling level |
| * |
| * The JPEG or YUV image uses (decompression, decoding) or will use (lossy |
| * compression, encoding) the specified level of chrominance subsampling. |
| * |
| * **Value** |
| * - One of the @ref TJSAMP "chrominance subsampling options" *[no default; |
| * must be explicitly specified for lossy compression, encoding, and |
| * decoding]* |
| */ |
| TJPARAM_SUBSAMP, |
| /** |
| * JPEG width (in pixels) [decompression only, read-only] |
| */ |
| TJPARAM_JPEGWIDTH, |
| /** |
| * JPEG height (in pixels) [decompression only, read-only] |
| */ |
| TJPARAM_JPEGHEIGHT, |
| /** |
| * JPEG data precision (bits per sample) [decompression only, read-only] |
| * |
| * The JPEG image uses the specified number of bits per sample. |
| * |
| * **Value** |
| * - `8`, `12`, or `16` |
| * |
| * 12-bit data precision implies #TJPARAM_OPTIMIZE unless #TJPARAM_ARITHMETIC |
| * is set. |
| */ |
| TJPARAM_PRECISION, |
| /** |
| * JPEG colorspace |
| * |
| * The JPEG image uses (decompression) or will use (lossy compression) the |
| * specified colorspace. |
| * |
| * **Value** |
| * - One of the @ref TJCS "JPEG colorspaces" *[default for lossy compression: |
| * automatically selected based on the subsampling level and pixel format]* |
| */ |
| TJPARAM_COLORSPACE, |
| /** |
| * Chrominance upsampling algorithm [lossy decompression only] |
| * |
| * **Value** |
| * - `0` *[default]* Use smooth upsampling when decompressing a JPEG image |
| * that was compressed using chrominance subsampling. This creates a smooth |
| * transition between neighboring chrominance components in order to reduce |
| * upsampling artifacts in the decompressed image. |
| * - `1` Use the fastest chrominance upsampling algorithm available, which |
| * may combine upsampling with color conversion. |
| */ |
| TJPARAM_FASTUPSAMPLE, |
| /** |
| * DCT/IDCT algorithm [lossy compression and decompression] |
| * |
| * **Value** |
| * - `0` *[default]* Use the most accurate DCT/IDCT algorithm available. |
| * - `1` Use the fastest DCT/IDCT algorithm available. |
| * |
| * This parameter is provided mainly for backward compatibility with libjpeg, |
| * which historically implemented several different DCT/IDCT algorithms |
| * because of performance limitations with 1990s CPUs. In the libjpeg-turbo |
| * implementation of the TurboJPEG API: |
| * - The "fast" and "accurate" DCT/IDCT algorithms perform similarly on |
| * modern x86/x86-64 CPUs that support AVX2 instructions. |
| * - The "fast" algorithm is generally only about 5-15% faster than the |
| * "accurate" algorithm on other types of CPUs. |
| * - The difference in accuracy between the "fast" and "accurate" algorithms |
| * is the most pronounced at JPEG quality levels above 90 and tends to be |
| * more pronounced with decompression than with compression. |
| * - The "fast" algorithm degrades and is not fully accelerated for JPEG |
| * quality levels above 97, so it will be slower than the "accurate" |
| * algorithm. |
| */ |
| TJPARAM_FASTDCT, |
| /** |
| * Optimized baseline entropy coding [lossy compression only] |
| * |
| * **Value** |
| * - `0` *[default]* The JPEG image will use the default Huffman tables. |
| * - `1` Optimal Huffman tables will be computed for the JPEG image. For |
| * lossless transformation, this can also be specified using |
| * #TJXOPT_OPTIMIZE. |
| * |
| * Optimized baseline entropy coding will improve compression slightly |
| * (generally 5% or less), but it will reduce compression performance |
| * considerably. |
| */ |
| TJPARAM_OPTIMIZE, |
| /** |
| * Progressive entropy coding |
| * |
| * **Value** |
| * - `0` *[default for compression, lossless transformation]* The lossy JPEG |
| * image uses (decompression) or will use (compression, lossless |
| * transformation) baseline entropy coding. |
| * - `1` The lossy JPEG image uses (decompression) or will use (compression, |
| * lossless transformation) progressive entropy coding. For lossless |
| * transformation, this can also be specified using #TJXOPT_PROGRESSIVE. |
| * |
| * Progressive entropy coding will generally improve compression relative to |
| * baseline entropy coding, but it will reduce compression and decompression |
| * performance considerably. Can be combined with #TJPARAM_ARITHMETIC. |
| * Implies #TJPARAM_OPTIMIZE unless #TJPARAM_ARITHMETIC is also set. |
| */ |
| TJPARAM_PROGRESSIVE, |
| /** |
| * Progressive JPEG scan limit for lossy JPEG images [decompression, lossless |
| * transformation] |
| * |
| * Setting this parameter will cause the decompression and transform |
| * functions to return an error if the number of scans in a progressive JPEG |
| * image exceeds the specified limit. The primary purpose of this is to |
| * allow security-critical applications to guard against an exploit of the |
| * progressive JPEG format described in |
| * <a href="https://libjpeg-turbo.org/pmwiki/uploads/About/TwoIssueswiththeJPEGStandard.pdf" target="_blank">this report</a>. |
| * |
| * **Value** |
| * - maximum number of progressive JPEG scans that the decompression and |
| * transform functions will process *[default: `0` (no limit)]* |
| * |
| * @see #TJPARAM_PROGRESSIVE |
| */ |
| TJPARAM_SCANLIMIT, |
| /** |
| * Arithmetic entropy coding |
| * |
| * **Value** |
| * - `0` *[default for compression, lossless transformation]* The lossy JPEG |
| * image uses (decompression) or will use (compression, lossless |
| * transformation) Huffman entropy coding. |
| * - `1` The lossy JPEG image uses (decompression) or will use (compression, |
| * lossless transformation) arithmetic entropy coding. For lossless |
| * transformation, this can also be specified using #TJXOPT_ARITHMETIC. |
| * |
| * Arithmetic entropy coding will generally improve compression relative to |
| * Huffman entropy coding, but it will reduce compression and decompression |
| * performance considerably. Can be combined with #TJPARAM_PROGRESSIVE. |
| */ |
| TJPARAM_ARITHMETIC, |
| /** |
| * Lossless JPEG |
| * |
| * **Value** |
| * - `0` *[default for compression]* The JPEG image is (decompression) or |
| * will be (compression) lossy/DCT-based. |
| * - `1` The JPEG image is (decompression) or will be (compression) |
| * lossless/predictive. |
| * |
| * In most cases, compressing and decompressing lossless JPEG images is |
| * considerably slower than compressing and decompressing lossy JPEG images. |
| * Also note that the following features are not available with lossless JPEG |
| * images: |
| * - Colorspace conversion (lossless JPEG images always use #TJCS_RGB, |
| * #TJCS_GRAY, or #TJCS_CMYK, depending on the pixel format of the source |
| * image) |
| * - Chrominance subsampling (lossless JPEG images always use #TJSAMP_444) |
| * - JPEG quality selection |
| * - DCT/IDCT algorithm selection |
| * - Progressive entropy coding |
| * - Arithmetic entropy coding |
| * - Compression from/decompression to planar YUV images |
| * - Decompression scaling |
| * - Lossless transformation |
| * |
| * @see #TJPARAM_LOSSLESSPSV, #TJPARAM_LOSSLESSPT |
| */ |
| TJPARAM_LOSSLESS, |
| /** |
| * Lossless JPEG predictor selection value (PSV) |
| * |
| * **Value** |
| * - `1`-`7` *[default for compression: `1`]* |
| * |
| * @see #TJPARAM_LOSSLESS |
| */ |
| TJPARAM_LOSSLESSPSV, |
| /** |
| * Lossless JPEG point transform (Pt) |
| * |
| * **Value** |
| * - `0` through ***precision*** *- 1*, where ***precision*** is the JPEG |
| * data precision in bits *[default for compression: `0`]* |
| * |
| * A point transform value of `0` is necessary in order to generate a fully |
| * lossless JPEG image. (A non-zero point transform value right-shifts the |
| * input samples by the specified number of bits, which is effectively a form |
| * of lossy color quantization.) |
| * |
| * @see #TJPARAM_LOSSLESS, #TJPARAM_PRECISION |
| */ |
| TJPARAM_LOSSLESSPT, |
| /** |
| * JPEG restart marker interval in MCU blocks (lossy) or samples (lossless) |
| * [compression only] |
| * |
| * The nature of entropy coding is such that a corrupt JPEG image cannot |
| * be decompressed beyond the point of corruption unless it contains restart |
| * markers. A restart marker stops and restarts the entropy coding algorithm |
| * so that, if a JPEG image is corrupted, decompression can resume at the |
| * next marker. Thus, adding more restart markers improves the fault |
| * tolerance of the JPEG image, but adding too many restart markers can |
| * adversely affect the compression ratio and performance. |
| * |
| * **Value** |
| * - the number of MCU blocks or samples between each restart marker |
| * *[default: `0` (no restart markers)]* |
| * |
| * Setting this parameter to a non-zero value sets #TJPARAM_RESTARTROWS to 0. |
| */ |
| TJPARAM_RESTARTBLOCKS, |
| /** |
| * JPEG restart marker interval in MCU rows (lossy) or sample rows (lossless) |
| * [compression only] |
| * |
| * See #TJPARAM_RESTARTBLOCKS for a description of restart markers. |
| * |
| * **Value** |
| * - the number of MCU rows or sample rows between each restart marker |
| * *[default: `0` (no restart markers)]* |
| * |
| * Setting this parameter to a non-zero value sets #TJPARAM_RESTARTBLOCKS to |
| * 0. |
| */ |
| TJPARAM_RESTARTROWS, |
| /** |
| * JPEG horizontal pixel density |
| * |
| * **Value** |
| * - The JPEG image has (decompression) or will have (compression) the |
| * specified horizontal pixel density *[default for compression: `1`]*. |
| * |
| * This value is stored in or read from the JPEG header. It does not affect |
| * the contents of the JPEG image. Note that this parameter is set by |
| * #tj3LoadImage8() when loading a Windows BMP file that contains pixel |
| * density information, and the value of this parameter is stored to a |
| * Windows BMP file by #tj3SaveImage8() if the value of #TJPARAM_DENSITYUNIT |
| * is `2`. |
| * |
| * @see TJPARAM_DENSITYUNIT |
| */ |
| TJPARAM_XDENSITY, |
| /** |
| * JPEG vertical pixel density |
| * |
| * **Value** |
| * - The JPEG image has (decompression) or will have (compression) the |
| * specified vertical pixel density *[default for compression: `1`]*. |
| * |
| * This value is stored in or read from the JPEG header. It does not affect |
| * the contents of the JPEG image. Note that this parameter is set by |
| * #tj3LoadImage8() when loading a Windows BMP file that contains pixel |
| * density information, and the value of this parameter is stored to a |
| * Windows BMP file by #tj3SaveImage8() if the value of #TJPARAM_DENSITYUNIT |
| * is `2`. |
| * |
| * @see TJPARAM_DENSITYUNIT |
| */ |
| TJPARAM_YDENSITY, |
| /** |
| * JPEG pixel density units |
| * |
| * **Value** |
| * - `0` *[default for compression]* The pixel density of the JPEG image is |
| * expressed (decompression) or will be expressed (compression) in unknown |
| * units. |
| * - `1` The pixel density of the JPEG image is expressed (decompression) or |
| * will be expressed (compression) in units of pixels/inch. |
| * - `2` The pixel density of the JPEG image is expressed (decompression) or |
| * will be expressed (compression) in units of pixels/cm. |
| * |
| * This value is stored in or read from the JPEG header. It does not affect |
| * the contents of the JPEG image. Note that this parameter is set by |
| * #tj3LoadImage8() when loading a Windows BMP file that contains pixel |
| * density information, and the value of this parameter is stored to a |
| * Windows BMP file by #tj3SaveImage8() if the value is `2`. |
| * |
| * @see TJPARAM_XDENSITY, TJPARAM_YDENSITY |
| */ |
| TJPARAM_DENSITYUNITS |
| }; |
| |
| |
| /** |
| * The number of error codes |
| */ |
| #define TJ_NUMERR 2 |
| |
| /** |
| * Error codes |
| */ |
| enum TJERR { |
| /** |
| * The error was non-fatal and recoverable, but the destination image may |
| * still be corrupt. |
| */ |
| TJERR_WARNING, |
| /** |
| * The error was fatal and non-recoverable. |
| */ |
| TJERR_FATAL |
| }; |
| |
| |
| /** |
| * The number of transform operations |
| */ |
| #define TJ_NUMXOP 8 |
| |
| /** |
| * Transform operations for #tj3Transform() |
| */ |
| enum TJXOP { |
| /** |
| * Do not transform the position of the image pixels |
| */ |
| TJXOP_NONE, |
| /** |
| * Flip (mirror) image horizontally. This transform is imperfect if there |
| * are any partial MCU blocks on the right edge (see #TJXOPT_PERFECT.) |
| */ |
| TJXOP_HFLIP, |
| /** |
| * Flip (mirror) image vertically. This transform is imperfect if there are |
| * any partial MCU blocks on the bottom edge (see #TJXOPT_PERFECT.) |
| */ |
| TJXOP_VFLIP, |
| /** |
| * Transpose image (flip/mirror along upper left to lower right axis.) This |
| * transform is always perfect. |
| */ |
| TJXOP_TRANSPOSE, |
| /** |
| * Transverse transpose image (flip/mirror along upper right to lower left |
| * axis.) This transform is imperfect if there are any partial MCU blocks in |
| * the image (see #TJXOPT_PERFECT.) |
| */ |
| TJXOP_TRANSVERSE, |
| /** |
| * Rotate image clockwise by 90 degrees. This transform is imperfect if |
| * there are any partial MCU blocks on the bottom edge (see |
| * #TJXOPT_PERFECT.) |
| */ |
| TJXOP_ROT90, |
| /** |
| * Rotate image 180 degrees. This transform is imperfect if there are any |
| * partial MCU blocks in the image (see #TJXOPT_PERFECT.) |
| */ |
| TJXOP_ROT180, |
| /** |
| * Rotate image counter-clockwise by 90 degrees. This transform is imperfect |
| * if there are any partial MCU blocks on the right edge (see |
| * #TJXOPT_PERFECT.) |
| */ |
| TJXOP_ROT270 |
| }; |
| |
| |
| /** |
| * This option will cause #tj3Transform() to return an error if the transform |
| * is not perfect. Lossless transforms operate on MCU blocks, whose size |
| * depends on the level of chrominance subsampling used (see #tjMCUWidth and |
| * #tjMCUHeight.) If the image's width or height is not evenly divisible by |
| * the MCU block size, then there will be partial MCU blocks on the right |
| * and/or bottom edges. It is not possible to move these partial MCU blocks to |
| * the top or left of the image, so any transform that would require that is |
| * "imperfect." If this option is not specified, then any partial MCU blocks |
| * that cannot be transformed will be left in place, which will create |
| * odd-looking strips on the right or bottom edge of the image. |
| */ |
| #define TJXOPT_PERFECT (1 << 0) |
| /** |
| * This option will cause #tj3Transform() to discard any partial MCU blocks |
| * that cannot be transformed. |
| */ |
| #define TJXOPT_TRIM (1 << 1) |
| /** |
| * This option will enable lossless cropping. See #tj3Transform() for more |
| * information. |
| */ |
| #define TJXOPT_CROP (1 << 2) |
| /** |
| * This option will discard the color data in the source image and produce a |
| * grayscale destination image. |
| */ |
| #define TJXOPT_GRAY (1 << 3) |
| /** |
| * This option will prevent #tj3Transform() from outputting a JPEG image for |
| * this particular transform. (This can be used in conjunction with a custom |
| * filter to capture the transformed DCT coefficients without transcoding |
| * them.) |
| */ |
| #define TJXOPT_NOOUTPUT (1 << 4) |
| /** |
| * This option will enable progressive entropy coding in the JPEG image |
| * generated by this particular transform. Progressive entropy coding will |
| * generally improve compression relative to baseline entropy coding (the |
| * default), but it will reduce decompression performance considerably. |
| * Can be combined with #TJXOPT_ARITHMETIC. Implies #TJXOPT_OPTIMIZE unless |
| * #TJXOPT_ARITHMETIC is also specified. |
| */ |
| #define TJXOPT_PROGRESSIVE (1 << 5) |
| /** |
| * This option will prevent #tj3Transform() from copying any extra markers |
| * (including EXIF and ICC profile data) from the source image to the |
| * destination image. |
| */ |
| #define TJXOPT_COPYNONE (1 << 6) |
| /** |
| * This option will enable arithmetic entropy coding in the JPEG image |
| * generated by this particular transform. Arithmetic entropy coding will |
| * generally improve compression relative to Huffman entropy coding (the |
| * default), but it will reduce decompression performance considerably. Can be |
| * combined with #TJXOPT_PROGRESSIVE. |
| */ |
| #define TJXOPT_ARITHMETIC (1 << 7) |
| /** |
| * This option will enable optimized baseline entropy coding in the JPEG image |
| * generated by this particular transform. Optimized baseline entropy coding |
| * will improve compression slightly (generally 5% or less.) |
| */ |
| #define TJXOPT_OPTIMIZE (1 << 8) |
| |
| |
| /** |
| * Scaling factor |
| */ |
| typedef struct { |
| /** |
| * Numerator |
| */ |
| int num; |
| /** |
| * Denominator |
| */ |
| int denom; |
| } tjscalingfactor; |
| |
| /** |
| * Cropping region |
| */ |
| typedef struct { |
| /** |
| * The left boundary of the cropping region. This must be evenly divisible |
| * by the MCU block width (see #tjMCUWidth.) |
| */ |
| int x; |
| /** |
| * The upper boundary of the cropping region. For lossless transformation, |
| * this must be evenly divisible by the MCU block height (see #tjMCUHeight.) |
| */ |
| int y; |
| /** |
| * The width of the cropping region. Setting this to 0 is the equivalent of |
| * setting it to the width of the source JPEG image - x. |
| */ |
| int w; |
| /** |
| * The height of the cropping region. Setting this to 0 is the equivalent of |
| * setting it to the height of the source JPEG image - y. |
| */ |
| int h; |
| } tjregion; |
| |
| /** |
| * A #tjregion structure that specifies no cropping |
| */ |
| static const tjregion TJUNCROPPED = { 0, 0, 0, 0 }; |
| |
| /** |
| * Lossless transform |
| */ |
| typedef struct tjtransform { |
| /** |
| * Cropping region |
| */ |
| tjregion r; |
| /** |
| * One of the @ref TJXOP "transform operations" |
| */ |
| int op; |
| /** |
| * The bitwise OR of one of more of the @ref TJXOPT_ARITHMETIC |
| * "transform options" |
| */ |
| int options; |
| /** |
| * Arbitrary data that can be accessed within the body of the callback |
| * function |
| */ |
| void *data; |
| /** |
| * A callback function that can be used to modify the DCT coefficients after |
| * they are losslessly transformed but before they are transcoded to a new |
| * JPEG image. This allows for custom filters or other transformations to be |
| * applied in the frequency domain. |
| * |
| * @param coeffs pointer to an array of transformed DCT coefficients. (NOTE: |
| * this pointer is not guaranteed to be valid once the callback returns, so |
| * applications wishing to hand off the DCT coefficients to another function |
| * or library should make a copy of them within the body of the callback.) |
| * |
| * @param arrayRegion #tjregion structure containing the width and height of |
| * the array pointed to by `coeffs` as well as its offset relative to the |
| * component plane. TurboJPEG implementations may choose to split each |
| * component plane into multiple DCT coefficient arrays and call the callback |
| * function once for each array. |
| * |
| * @param planeRegion #tjregion structure containing the width and height of |
| * the component plane to which `coeffs` belongs |
| * |
| * @param componentID ID number of the component plane to which `coeffs` |
| * belongs. (Y, Cb, and Cr have, respectively, ID's of 0, 1, and 2 in |
| * typical JPEG images.) |
| * |
| * @param transformID ID number of the transformed image to which `coeffs` |
| * belongs. This is the same as the index of the transform in the |
| * `transforms` array that was passed to #tj3Transform(). |
| * |
| * @param transform a pointer to a #tjtransform structure that specifies the |
| * parameters and/or cropping region for this transform |
| * |
| * @return 0 if the callback was successful, or -1 if an error occurred. |
| */ |
| int (*customFilter) (short *coeffs, tjregion arrayRegion, |
| tjregion planeRegion, int componentIndex, |
| int transformIndex, struct tjtransform *transform); |
| } tjtransform; |
| |
| /** |
| * TurboJPEG instance handle |
| */ |
| typedef void *tjhandle; |
| |
| |
| /** |
| * Compute the scaled value of `dimension` using the given scaling factor. |
| * This macro performs the integer equivalent of `ceil(dimension * |
| * scalingFactor)`. |
| */ |
| #define TJSCALED(dimension, scalingFactor) \ |
| (((dimension) * scalingFactor.num + scalingFactor.denom - 1) / \ |
| scalingFactor.denom) |
| |
| /** |
| * A #tjscalingfactor structure that specifies a scaling factor of 1/1 (no |
| * scaling) |
| */ |
| static const tjscalingfactor TJUNSCALED = { 1, 1 }; |
| |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| |
| /** |
| * Create a new TurboJPEG instance. |
| * |
| * @param initType one of the @ref TJINIT "initialization options" |
| * |
| * @return a handle to the newly-created instance, or NULL if an error occurred |
| * (see #tj3GetErrorStr().) |
| */ |
| DLLEXPORT tjhandle tj3Init(int initType); |
| |
| |
| /** |
| * Set the value of a parameter. |
| * |
| * @param handle handle to a TurboJPEG instance |
| * |
| * @param param one of the @ref TJPARAM "parameters" |
| * |
| * @param value value of the parameter (refer to @ref TJPARAM |
| * "parameter documentation") |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr().) |
| */ |
| DLLEXPORT int tj3Set(tjhandle handle, int param, int value); |
| |
| |
| /** |
| * Get the value of a parameter. |
| * |
| * @param handle handle to a TurboJPEG instance |
| * |
| * @param param one of the @ref TJPARAM "parameters" |
| * |
| * @return the value of the specified parameter, or -1 if the value is unknown. |
| */ |
| DLLEXPORT int tj3Get(tjhandle handle, int param); |
| |
| |
| /** |
| * Compress an 8-bit-per-sample packed-pixel RGB, grayscale, or CMYK image into |
| * an 8-bit-per-sample JPEG image. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * compression |
| * |
| * @param srcBuf pointer to a buffer containing a packed-pixel RGB, grayscale, |
| * or CMYK source image to be compressed. This buffer should normally be |
| * `pitch * height` samples in size. However, you can also use this parameter |
| * to compress from a specific region of a larger buffer. |
| * |
| * @param width width (in pixels) of the source image |
| * |
| * @param pitch samples per row in the source image. Normally this should be |
| * <tt>width * #tjPixelSize[pixelFormat]</tt>, if the image is unpadded. |
| * (Setting this parameter to 0 is the equivalent of setting it to |
| * <tt>width * #tjPixelSize[pixelFormat]</tt>.) However, you can also use this |
| * parameter to specify the row alignment/padding of the source image, to skip |
| * rows, or to compress from a specific region of a larger buffer. |
| * |
| * @param height height (in pixels) of the source image |
| * |
| * @param pixelFormat pixel format of the source image (see @ref TJPF |
| * "Pixel formats".) |
| * |
| * @param jpegBuf address of a pointer to a byte buffer that will receive the |
| * JPEG image. TurboJPEG has the ability to reallocate the JPEG buffer to |
| * accommodate the size of the JPEG image. Thus, you can choose to: |
| * -# pre-allocate the JPEG buffer with an arbitrary size using #tj3Alloc() and |
| * let TurboJPEG grow the buffer as needed, |
| * -# set `*jpegBuf` to NULL to tell TurboJPEG to allocate the buffer for you, |
| * or |
| * -# pre-allocate the buffer to a "worst case" size determined by calling |
| * #tj3JPEGBufSize(). This should ensure that the buffer never has to be |
| * re-allocated. (Setting #TJPARAM_NOREALLOC guarantees that it won't be.) |
| * . |
| * If you choose option 1, then `*jpegSize` should be set to the size of your |
| * pre-allocated buffer. In any case, unless you have set #TJPARAM_NOREALLOC, |
| * you should always check `*jpegBuf` upon return from this function, as it may |
| * have changed. |
| * |
| * @param jpegSize pointer to a size_t variable that holds the size of the JPEG |
| * buffer. If `*jpegBuf` points to a pre-allocated buffer, then `*jpegSize` |
| * should be set to the size of the buffer. Upon return, `*jpegSize` will |
| * contain the size of the JPEG image (in bytes.) If `*jpegBuf` points to a |
| * JPEG buffer that is being reused from a previous call to one of the JPEG |
| * compression functions, then `*jpegSize` is ignored. |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3Compress8(tjhandle handle, const unsigned char *srcBuf, |
| int width, int pitch, int height, int pixelFormat, |
| unsigned char **jpegBuf, size_t *jpegSize); |
| |
| /** |
| * Compress a 12-bit-per-sample packed-pixel RGB, grayscale, or CMYK image into |
| * a 12-bit-per-sample JPEG image. |
| * |
| * \details \copydetails tj3Compress8() |
| */ |
| DLLEXPORT int tj3Compress12(tjhandle handle, const short *srcBuf, int width, |
| int pitch, int height, int pixelFormat, |
| unsigned char **jpegBuf, size_t *jpegSize); |
| |
| /** |
| * Compress a 16-bit-per-sample packed-pixel RGB, grayscale, or CMYK image into |
| * a 16-bit-per-sample lossless JPEG image. |
| * |
| * \details \copydetails tj3Compress8() |
| */ |
| DLLEXPORT int tj3Compress16(tjhandle handle, const unsigned short *srcBuf, |
| int width, int pitch, int height, int pixelFormat, |
| unsigned char **jpegBuf, size_t *jpegSize); |
| |
| |
| /** |
| * Compress an 8-bit-per-sample unified planar YUV image into an |
| * 8-bit-per-sample JPEG image. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * compression |
| * |
| * @param srcBuf pointer to a buffer containing a unified planar YUV source |
| * image to be compressed. The size of this buffer should match the value |
| * returned by #tj3YUVBufSize() for the given image width, height, row |
| * alignment, and level of chrominance subsampling (see #TJPARAM_SUBSAMP.) The |
| * Y, U (Cb), and V (Cr) image planes should be stored sequentially in the |
| * buffer. (Refer to @ref YUVnotes "YUV Image Format Notes".) |
| * |
| * @param width width (in pixels) of the source image. If the width is not an |
| * even multiple of the MCU block width (see #tjMCUWidth), then an intermediate |
| * buffer copy will be performed. |
| * |
| * @param align row alignment (in bytes) of the source image (must be a power |
| * of 2.) Setting this parameter to n indicates that each row in each plane of |
| * the source image is padded to the nearest multiple of n bytes |
| * (1 = unpadded.) |
| * |
| * @param height height (in pixels) of the source image. If the height is not |
| * an even multiple of the MCU block height (see #tjMCUHeight), then an |
| * intermediate buffer copy will be performed. |
| * |
| * @param jpegBuf address of a pointer to a byte buffer that will receive the |
| * JPEG image. TurboJPEG has the ability to reallocate the JPEG buffer to |
| * accommodate the size of the JPEG image. Thus, you can choose to: |
| * -# pre-allocate the JPEG buffer with an arbitrary size using #tj3Alloc() and |
| * let TurboJPEG grow the buffer as needed, |
| * -# set `*jpegBuf` to NULL to tell TurboJPEG to allocate the buffer for you, |
| * or |
| * -# pre-allocate the buffer to a "worst case" size determined by calling |
| * #tj3JPEGBufSize(). This should ensure that the buffer never has to be |
| * re-allocated. (Setting #TJPARAM_NOREALLOC guarantees that it won't be.) |
| * . |
| * If you choose option 1, then `*jpegSize` should be set to the size of your |
| * pre-allocated buffer. In any case, unless you have set #TJPARAM_NOREALLOC, |
| * you should always check `*jpegBuf` upon return from this function, as it may |
| * have changed. |
| * |
| * @param jpegSize pointer to a size_t variable that holds the size of the JPEG |
| * buffer. If `*jpegBuf` points to a pre-allocated buffer, then `*jpegSize` |
| * should be set to the size of the buffer. Upon return, `*jpegSize` will |
| * contain the size of the JPEG image (in bytes.) If `*jpegBuf` points to a |
| * JPEG buffer that is being reused from a previous call to one of the JPEG |
| * compression functions, then `*jpegSize` is ignored. |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3CompressFromYUV8(tjhandle handle, |
| const unsigned char *srcBuf, int width, |
| int align, int height, |
| unsigned char **jpegBuf, size_t *jpegSize); |
| |
| |
| /** |
| * Compress a set of 8-bit-per-sample Y, U (Cb), and V (Cr) image planes into |
| * an 8-bit-per-sample JPEG image. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * compression |
| * |
| * @param srcPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes |
| * (or just a Y plane, if compressing a grayscale image) that contain a YUV |
| * source image to be compressed. These planes can be contiguous or |
| * non-contiguous in memory. The size of each plane should match the value |
| * returned by #tj3YUVPlaneSize() for the given image width, height, strides, |
| * and level of chrominance subsampling (see #TJPARAM_SUBSAMP.) Refer to |
| * @ref YUVnotes "YUV Image Format Notes" for more details. |
| * |
| * @param width width (in pixels) of the source image. If the width is not an |
| * even multiple of the MCU block width (see #tjMCUWidth), then an intermediate |
| * buffer copy will be performed. |
| * |
| * @param strides an array of integers, each specifying the number of bytes per |
| * row in the corresponding plane of the YUV source image. Setting the stride |
| * for any plane to 0 is the same as setting it to the plane width (see |
| * @ref YUVnotes "YUV Image Format Notes".) If `strides` is NULL, then the |
| * strides for all planes will be set to their respective plane widths. You |
| * can adjust the strides in order to specify an arbitrary amount of row |
| * padding in each plane or to create a JPEG image from a subregion of a larger |
| * planar YUV image. |
| * |
| * @param height height (in pixels) of the source image. If the height is not |
| * an even multiple of the MCU block height (see #tjMCUHeight), then an |
| * intermediate buffer copy will be performed. |
| * |
| * @param jpegBuf address of a pointer to a byte buffer that will receive the |
| * JPEG image. TurboJPEG has the ability to reallocate the JPEG buffer to |
| * accommodate the size of the JPEG image. Thus, you can choose to: |
| * -# pre-allocate the JPEG buffer with an arbitrary size using #tj3Alloc() and |
| * let TurboJPEG grow the buffer as needed, |
| * -# set `*jpegBuf` to NULL to tell TurboJPEG to allocate the buffer for you, |
| * or |
| * -# pre-allocate the buffer to a "worst case" size determined by calling |
| * #tj3JPEGBufSize(). This should ensure that the buffer never has to be |
| * re-allocated. (Setting #TJPARAM_NOREALLOC guarantees that it won't be.) |
| * . |
| * If you choose option 1, then `*jpegSize` should be set to the size of your |
| * pre-allocated buffer. In any case, unless you have set #TJPARAM_NOREALLOC, |
| * you should always check `*jpegBuf` upon return from this function, as it may |
| * have changed. |
| * |
| * @param jpegSize pointer to a size_t variable that holds the size of the JPEG |
| * buffer. If `*jpegBuf` points to a pre-allocated buffer, then `*jpegSize` |
| * should be set to the size of the buffer. Upon return, `*jpegSize` will |
| * contain the size of the JPEG image (in bytes.) If `*jpegBuf` points to a |
| * JPEG buffer that is being reused from a previous call to one of the JPEG |
| * compression functions, then `*jpegSize` is ignored. |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3CompressFromYUVPlanes8(tjhandle handle, |
| const unsigned char * const *srcPlanes, |
| int width, const int *strides, |
| int height, unsigned char **jpegBuf, |
| size_t *jpegSize); |
| |
| |
| /** |
| * The maximum size of the buffer (in bytes) required to hold a JPEG image with |
| * the given parameters. The number of bytes returned by this function is |
| * larger than the size of the uncompressed source image. The reason for this |
| * is that the JPEG format uses 16-bit coefficients, so it is possible for a |
| * very high-quality source image with very high-frequency content to expand |
| * rather than compress when converted to the JPEG format. Such images |
| * represent very rare corner cases, but since there is no way to predict the |
| * size of a JPEG image prior to compression, the corner cases have to be |
| * handled. |
| * |
| * @param width width (in pixels) of the image |
| * |
| * @param height height (in pixels) of the image |
| * |
| * @param jpegSubsamp the level of chrominance subsampling to be used when |
| * generating the JPEG image (see @ref TJSAMP |
| * "Chrominance subsampling options".) #TJSAMP_UNKNOWN is treated like |
| * #TJSAMP_444, since a buffer large enough to hold a JPEG image with no |
| * subsampling should also be large enough to hold a JPEG image with an |
| * arbitrary level of subsampling. Note that lossless JPEG images always |
| * use #TJSAMP_444. |
| * |
| * @return the maximum size of the buffer (in bytes) required to hold the |
| * image, or 0 if the arguments are out of bounds. |
| */ |
| DLLEXPORT size_t tj3JPEGBufSize(int width, int height, int jpegSubsamp); |
| |
| |
| /** |
| * The size of the buffer (in bytes) required to hold a unified planar YUV |
| * image with the given parameters. |
| * |
| * @param width width (in pixels) of the image |
| * |
| * @param align row alignment (in bytes) of the image (must be a power of 2.) |
| * Setting this parameter to n specifies that each row in each plane of the |
| * image will be padded to the nearest multiple of n bytes (1 = unpadded.) |
| * |
| * @param height height (in pixels) of the image |
| * |
| * @param subsamp level of chrominance subsampling in the image (see |
| * @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @return the size of the buffer (in bytes) required to hold the image, or 0 |
| * if the arguments are out of bounds. |
| */ |
| DLLEXPORT size_t tj3YUVBufSize(int width, int align, int height, int subsamp); |
| |
| |
| /** |
| * The size of the buffer (in bytes) required to hold a YUV image plane with |
| * the given parameters. |
| * |
| * @param componentID ID number of the image plane (0 = Y, 1 = U/Cb, 2 = V/Cr) |
| * |
| * @param width width (in pixels) of the YUV image. NOTE: this is the width of |
| * the whole image, not the plane width. |
| * |
| * @param stride bytes per row in the image plane. Setting this to 0 is the |
| * equivalent of setting it to the plane width. |
| * |
| * @param height height (in pixels) of the YUV image. NOTE: this is the height |
| * of the whole image, not the plane height. |
| * |
| * @param subsamp level of chrominance subsampling in the image (see |
| * @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @return the size of the buffer (in bytes) required to hold the YUV image |
| * plane, or 0 if the arguments are out of bounds. |
| */ |
| DLLEXPORT size_t tj3YUVPlaneSize(int componentID, int width, int stride, |
| int height, int subsamp); |
| |
| |
| /** |
| * The plane width of a YUV image plane with the given parameters. Refer to |
| * @ref YUVnotes "YUV Image Format Notes" for a description of plane width. |
| * |
| * @param componentID ID number of the image plane (0 = Y, 1 = U/Cb, 2 = V/Cr) |
| * |
| * @param width width (in pixels) of the YUV image |
| * |
| * @param subsamp level of chrominance subsampling in the image (see |
| * @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @return the plane width of a YUV image plane with the given parameters, or 0 |
| * if the arguments are out of bounds. |
| */ |
| DLLEXPORT int tj3YUVPlaneWidth(int componentID, int width, int subsamp); |
| |
| |
| /** |
| * The plane height of a YUV image plane with the given parameters. Refer to |
| * @ref YUVnotes "YUV Image Format Notes" for a description of plane height. |
| * |
| * @param componentID ID number of the image plane (0 = Y, 1 = U/Cb, 2 = V/Cr) |
| * |
| * @param height height (in pixels) of the YUV image |
| * |
| * @param subsamp level of chrominance subsampling in the image (see |
| * @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @return the plane height of a YUV image plane with the given parameters, or |
| * 0 if the arguments are out of bounds. |
| */ |
| DLLEXPORT int tj3YUVPlaneHeight(int componentID, int height, int subsamp); |
| |
| |
| /** |
| * Encode an 8-bit-per-sample packed-pixel RGB or grayscale image into an |
| * 8-bit-per-sample unified planar YUV image. This function performs color |
| * conversion (which is accelerated in the libjpeg-turbo implementation) but |
| * does not execute any of the other steps in the JPEG compression process. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * compression |
| * |
| * @param srcBuf pointer to a buffer containing a packed-pixel RGB or grayscale |
| * source image to be encoded. This buffer should normally be `pitch * height` |
| * bytes in size. However, you can also use this parameter to encode from a |
| * specific region of a larger buffer. |
| * |
| * @param width width (in pixels) of the source image |
| * |
| * @param pitch bytes per row in the source image. Normally this should be |
| * <tt>width * #tjPixelSize[pixelFormat]</tt>, if the image is unpadded. |
| * (Setting this parameter to 0 is the equivalent of setting it to |
| * <tt>width * #tjPixelSize[pixelFormat]</tt>.) However, you can also use this |
| * parameter to specify the row alignment/padding of the source image, to skip |
| * rows, or to encode from a specific region of a larger packed-pixel image. |
| * |
| * @param height height (in pixels) of the source image |
| * |
| * @param pixelFormat pixel format of the source image (see @ref TJPF |
| * "Pixel formats".) |
| * |
| * @param dstBuf pointer to a buffer that will receive the unified planar YUV |
| * image. Use #tj3YUVBufSize() to determine the appropriate size for this |
| * buffer based on the image width, height, row alignment, and level of |
| * chrominance subsampling (see #TJPARAM_SUBSAMP.) The Y, U (Cb), and V (Cr) |
| * image planes will be stored sequentially in the buffer. (Refer to |
| * @ref YUVnotes "YUV Image Format Notes".) |
| * |
| * @param align row alignment (in bytes) of the YUV image (must be a power of |
| * 2.) Setting this parameter to n will cause each row in each plane of the |
| * YUV image to be padded to the nearest multiple of n bytes (1 = unpadded.) |
| * To generate images suitable for X Video, `align` should be set to 4. |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3EncodeYUV8(tjhandle handle, const unsigned char *srcBuf, |
| int width, int pitch, int height, int pixelFormat, |
| unsigned char *dstBuf, int align); |
| |
| |
| /** |
| * Encode an 8-bit-per-sample packed-pixel RGB or grayscale image into separate |
| * 8-bit-per-sample Y, U (Cb), and V (Cr) image planes. This function performs |
| * color conversion (which is accelerated in the libjpeg-turbo implementation) |
| * but does not execute any of the other steps in the JPEG compression process. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * compression |
| * |
| * @param srcBuf pointer to a buffer containing a packed-pixel RGB or grayscale |
| * source image to be encoded. This buffer should normally be `pitch * height` |
| * bytes in size. However, you can also use this parameter to encode from a |
| * specific region of a larger buffer. |
| * |
| * |
| * @param width width (in pixels) of the source image |
| * |
| * @param pitch bytes per row in the source image. Normally this should be |
| * <tt>width * #tjPixelSize[pixelFormat]</tt>, if the image is unpadded. |
| * (Setting this parameter to 0 is the equivalent of setting it to |
| * <tt>width * #tjPixelSize[pixelFormat]</tt>.) However, you can also use this |
| * parameter to specify the row alignment/padding of the source image, to skip |
| * rows, or to encode from a specific region of a larger packed-pixel image. |
| * |
| * @param height height (in pixels) of the source image |
| * |
| * @param pixelFormat pixel format of the source image (see @ref TJPF |
| * "Pixel formats".) |
| * |
| * @param dstPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes |
| * (or just a Y plane, if generating a grayscale image) that will receive the |
| * encoded image. These planes can be contiguous or non-contiguous in memory. |
| * Use #tj3YUVPlaneSize() to determine the appropriate size for each plane |
| * based on the image width, height, strides, and level of chrominance |
| * subsampling (see #TJPARAM_SUBSAMP.) Refer to @ref YUVnotes |
| * "YUV Image Format Notes" for more details. |
| * |
| * @param strides an array of integers, each specifying the number of bytes per |
| * row in the corresponding plane of the YUV image. Setting the stride for any |
| * plane to 0 is the same as setting it to the plane width (see @ref YUVnotes |
| * "YUV Image Format Notes".) If `strides` is NULL, then the strides for all |
| * planes will be set to their respective plane widths. You can adjust the |
| * strides in order to add an arbitrary amount of row padding to each plane or |
| * to encode an RGB or grayscale image into a subregion of a larger planar YUV |
| * image. |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3EncodeYUVPlanes8(tjhandle handle, const unsigned char *srcBuf, |
| int width, int pitch, int height, |
| int pixelFormat, unsigned char **dstPlanes, |
| int *strides); |
| |
| |
| /** |
| * Retrieve information about a JPEG image without decompressing it, or prime |
| * the decompressor with quantization and Huffman tables. If a JPEG image is |
| * passed to this function, then the @ref TJPARAM "parameters" that describe |
| * the JPEG image will be set when the function returns. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * decompression |
| * |
| * @param jpegBuf pointer to a byte buffer containing a JPEG image or an |
| * "abbreviated table specification" (AKA "tables-only") datastream. Passing a |
| * tables-only datastream to this function primes the decompressor with |
| * quantization and Huffman tables that can be used when decompressing |
| * subsequent "abbreviated image" datastreams. This is useful, for instance, |
| * when decompressing video streams in which all frames share the same |
| * quantization and Huffman tables. |
| * |
| * @param jpegSize size of the JPEG image or tables-only datastream (in bytes) |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3DecompressHeader(tjhandle handle, |
| const unsigned char *jpegBuf, |
| size_t jpegSize); |
| |
| |
| /** |
| * Returns a list of fractional scaling factors that the JPEG decompressor |
| * supports. |
| * |
| * @param numScalingFactors pointer to an integer variable that will receive |
| * the number of elements in the list |
| * |
| * @return a pointer to a list of fractional scaling factors, or NULL if an |
| * error is encountered (see #tj3GetErrorStr().) |
| */ |
| DLLEXPORT tjscalingfactor *tj3GetScalingFactors(int *numScalingFactors); |
| |
| |
| /** |
| * Set the scaling factor for subsequent lossy decompression operations. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * decompression |
| * |
| * @param scalingFactor #tjscalingfactor structure that specifies a fractional |
| * scaling factor that the decompressor supports (see #tj3GetScalingFactors()), |
| * or <tt>#TJUNSCALED</tt> for no scaling. Decompression scaling is a function |
| * of the IDCT algorithm, so scaling factors are generally limited to multiples |
| * of 1/8. If the entire JPEG image will be decompressed, then the width and |
| * height of the scaled destination image can be determined by calling |
| * #TJSCALED() with the JPEG width and height (see #TJPARAM_JPEGWIDTH and |
| * #TJPARAM_JPEGHEIGHT) and the specified scaling factor. When decompressing |
| * into a planar YUV image, an intermediate buffer copy will be performed if |
| * the width or height of the scaled destination image is not an even multiple |
| * of the MCU block size (see #tjMCUWidth and #tjMCUHeight.) Note that |
| * decompression scaling is not available (and the specified scaling factor is |
| * ignored) when decompressing lossless JPEG images (see #TJPARAM_LOSSLESS), |
| * since the IDCT algorithm is not used with those images. Note also that |
| * #TJPARAM_FASTDCT is ignored when decompression scaling is enabled. |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr().) |
| */ |
| DLLEXPORT int tj3SetScalingFactor(tjhandle handle, |
| tjscalingfactor scalingFactor); |
| |
| |
| /** |
| * Set the cropping region for partially decompressing a lossy JPEG image into |
| * a packed-pixel image |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * decompression |
| * |
| * @param croppingRegion #tjregion structure that specifies a subregion of the |
| * JPEG image to decompress, or <tt>#TJUNCROPPED</tt> for no cropping. The |
| * left boundary of the cropping region must be evenly divisible by the scaled |
| * MCU block width (<tt>#TJSCALED(#tjMCUWidth[subsamp], scalingFactor)</tt>, |
| * where `subsamp` is the level of chrominance subsampling in the JPEG image |
| * (see #TJPARAM_SUBSAMP) and `scalingFactor` is the decompression scaling |
| * factor (see #tj3SetScalingFactor().) The cropping region should be |
| * specified relative to the scaled image dimensions. Unless `croppingRegion` |
| * is <tt>#TJUNCROPPED</tt>, the JPEG header must be read (see |
| * #tj3DecompressHeader()) prior to calling this function. |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr().) |
| */ |
| DLLEXPORT int tj3SetCroppingRegion(tjhandle handle, tjregion croppingRegion); |
| |
| |
| /** |
| * Decompress an 8-bit-per-sample JPEG image into an 8-bit-per-sample |
| * packed-pixel RGB, grayscale, or CMYK image. The @ref TJPARAM "parameters" |
| * that describe the JPEG image will be set when this function returns. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * decompression |
| * |
| * @param jpegBuf pointer to a byte buffer containing the JPEG image to |
| * decompress |
| * |
| * @param jpegSize size of the JPEG image (in bytes) |
| * |
| * @param dstBuf pointer to a buffer that will receive the packed-pixel |
| * decompressed image. This buffer should normally be |
| * `pitch * destinationHeight` samples in size. However, you can also use this |
| * parameter to decompress into a specific region of a larger buffer. NOTE: |
| * If the JPEG image is lossy, then `destinationHeight` is either the scaled |
| * JPEG height (see #TJSCALED(), #TJPARAM_JPEGHEIGHT, and |
| * #tj3SetScalingFactor()) or the height of the cropping region (see |
| * #tj3SetCroppingRegion().) If the JPEG image is lossless, then |
| * `destinationHeight` is the JPEG height. |
| * |
| * @param pitch samples per row in the destination image. Normally this should |
| * be set to <tt>destinationWidth * #tjPixelSize[pixelFormat]</tt>, if the |
| * destination image should be unpadded. (Setting this parameter to 0 is the |
| * equivalent of setting it to |
| * <tt>destinationWidth * #tjPixelSize[pixelFormat]</tt>.) However, you can |
| * also use this parameter to specify the row alignment/padding of the |
| * destination image, to skip rows, or to decompress into a specific region of |
| * a larger buffer. NOTE: If the JPEG image is lossy, then `destinationWidth` |
| * is either the scaled JPEG width (see #TJSCALED(), #TJPARAM_JPEGWIDTH, and |
| * #tj3SetScalingFactor()) or the width of the cropping region (see |
| * #tj3SetCroppingRegion().) If the JPEG image is lossless, then |
| * `destinationWidth` is the JPEG width. |
| * |
| * @param pixelFormat pixel format of the destination image (see @ref |
| * TJPF "Pixel formats".) |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3Decompress8(tjhandle handle, const unsigned char *jpegBuf, |
| size_t jpegSize, unsigned char *dstBuf, int pitch, |
| int pixelFormat); |
| |
| /** |
| * Decompress a 12-bit-per-sample JPEG image into a 12-bit-per-sample |
| * packed-pixel RGB, grayscale, or CMYK image. |
| * |
| * \details \copydetails tj3Decompress8() |
| */ |
| DLLEXPORT int tj3Decompress12(tjhandle handle, const unsigned char *jpegBuf, |
| size_t jpegSize, short *dstBuf, int pitch, |
| int pixelFormat); |
| |
| /** |
| * Decompress a 16-bit-per-sample lossless JPEG image into a 16-bit-per-sample |
| * packed-pixel RGB, grayscale, or CMYK image. |
| * |
| * \details \copydetails tj3Decompress8() |
| */ |
| DLLEXPORT int tj3Decompress16(tjhandle handle, const unsigned char *jpegBuf, |
| size_t jpegSize, unsigned short *dstBuf, |
| int pitch, int pixelFormat); |
| |
| |
| /** |
| * Decompress an 8-bit-per-sample JPEG image into an 8-bit-per-sample unified |
| * planar YUV image. This function performs JPEG decompression but leaves out |
| * the color conversion step, so a planar YUV image is generated instead of a |
| * packed-pixel image. The @ref TJPARAM "parameters" that describe the JPEG |
| * image will be set when this function returns. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * decompression |
| * |
| * @param jpegBuf pointer to a byte buffer containing the JPEG image to |
| * decompress |
| * |
| * @param jpegSize size of the JPEG image (in bytes) |
| * |
| * @param dstBuf pointer to a buffer that will receive the unified planar YUV |
| * decompressed image. Use #tj3YUVBufSize() to determine the appropriate size |
| * for this buffer based on the scaled JPEG width and height (see #TJSCALED(), |
| * #TJPARAM_JPEGWIDTH, #TJPARAM_JPEGHEIGHT, and #tj3SetScalingFactor()), row |
| * alignment, and level of chrominance subsampling (see #TJPARAM_SUBSAMP.) The |
| * Y, U (Cb), and V (Cr) image planes will be stored sequentially in the |
| * buffer. (Refer to @ref YUVnotes "YUV Image Format Notes".) |
| * |
| * @param align row alignment (in bytes) of the YUV image (must be a power of |
| * 2.) Setting this parameter to n will cause each row in each plane of the |
| * YUV image to be padded to the nearest multiple of n bytes (1 = unpadded.) |
| * To generate images suitable for X Video, `align` should be set to 4. |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3DecompressToYUV8(tjhandle handle, |
| const unsigned char *jpegBuf, |
| size_t jpegSize, |
| unsigned char *dstBuf, int align); |
| |
| |
| /** |
| * Decompress an 8-bit-per-sample JPEG image into separate 8-bit-per-sample Y, |
| * U (Cb), and V (Cr) image planes. This function performs JPEG decompression |
| * but leaves out the color conversion step, so a planar YUV image is generated |
| * instead of a packed-pixel image. The @ref TJPARAM "parameters" that |
| * describe the JPEG image will be set when this function returns. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * decompression |
| * |
| * @param jpegBuf pointer to a byte buffer containing the JPEG image to |
| * decompress |
| * |
| * @param jpegSize size of the JPEG image (in bytes) |
| * |
| * @param dstPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes |
| * (or just a Y plane, if decompressing a grayscale image) that will receive |
| * the decompressed image. These planes can be contiguous or non-contiguous in |
| * memory. Use #tj3YUVPlaneSize() to determine the appropriate size for each |
| * plane based on the scaled JPEG width and height (see #TJSCALED(), |
| * #TJPARAM_JPEGWIDTH, #TJPARAM_JPEGHEIGHT, and #tj3SetScalingFactor()), |
| * strides, and level of chrominance subsampling (see #TJPARAM_SUBSAMP.) Refer |
| * to @ref YUVnotes "YUV Image Format Notes" for more details. |
| * |
| * @param strides an array of integers, each specifying the number of bytes per |
| * row in the corresponding plane of the YUV image. Setting the stride for any |
| * plane to 0 is the same as setting it to the scaled plane width (see |
| * @ref YUVnotes "YUV Image Format Notes".) If `strides` is NULL, then the |
| * strides for all planes will be set to their respective scaled plane widths. |
| * You can adjust the strides in order to add an arbitrary amount of row |
| * padding to each plane or to decompress the JPEG image into a subregion of a |
| * larger planar YUV image. |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3DecompressToYUVPlanes8(tjhandle handle, |
| const unsigned char *jpegBuf, |
| size_t jpegSize, |
| unsigned char **dstPlanes, |
| int *strides); |
| |
| |
| /** |
| * Decode an 8-bit-per-sample unified planar YUV image into an 8-bit-per-sample |
| * packed-pixel RGB or grayscale image. This function performs color |
| * conversion (which is accelerated in the libjpeg-turbo implementation) but |
| * does not execute any of the other steps in the JPEG decompression process. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * decompression |
| * |
| * @param srcBuf pointer to a buffer containing a unified planar YUV source |
| * image to be decoded. The size of this buffer should match the value |
| * returned by #tj3YUVBufSize() for the given image width, height, row |
| * alignment, and level of chrominance subsampling (see #TJPARAM_SUBSAMP.) The |
| * Y, U (Cb), and V (Cr) image planes should be stored sequentially in the |
| * source buffer. (Refer to @ref YUVnotes "YUV Image Format Notes".) |
| * |
| * @param align row alignment (in bytes) of the YUV source image (must be a |
| * power of 2.) Setting this parameter to n indicates that each row in each |
| * plane of the YUV source image is padded to the nearest multiple of n bytes |
| * (1 = unpadded.) |
| * |
| * @param dstBuf pointer to a buffer that will receive the packed-pixel decoded |
| * image. This buffer should normally be `pitch * height` bytes in size. |
| * However, you can also use this parameter to decode into a specific region of |
| * a larger buffer. |
| * |
| * @param width width (in pixels) of the source and destination images |
| * |
| * @param pitch bytes per row in the destination image. Normally this should |
| * be set to <tt>width * #tjPixelSize[pixelFormat]</tt>, if the destination |
| * image should be unpadded. (Setting this parameter to 0 is the equivalent of |
| * setting it to <tt>width * #tjPixelSize[pixelFormat]</tt>.) However, you can |
| * also use this parameter to specify the row alignment/padding of the |
| * destination image, to skip rows, or to decode into a specific region of a |
| * larger buffer. |
| * |
| * @param height height (in pixels) of the source and destination images |
| * |
| * @param pixelFormat pixel format of the destination image (see @ref TJPF |
| * "Pixel formats".) |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3DecodeYUV8(tjhandle handle, const unsigned char *srcBuf, |
| int align, unsigned char *dstBuf, int width, |
| int pitch, int height, int pixelFormat); |
| |
| |
| /** |
| * Decode a set of 8-bit-per-sample Y, U (Cb), and V (Cr) image planes into an |
| * 8-bit-per-sample packed-pixel RGB or grayscale image. This function |
| * performs color conversion (which is accelerated in the libjpeg-turbo |
| * implementation) but does not execute any of the other steps in the JPEG |
| * decompression process. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * decompression |
| * |
| * @param srcPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes |
| * (or just a Y plane, if decoding a grayscale image) that contain a YUV image |
| * to be decoded. These planes can be contiguous or non-contiguous in memory. |
| * The size of each plane should match the value returned by #tj3YUVPlaneSize() |
| * for the given image width, height, strides, and level of chrominance |
| * subsampling (see #TJPARAM_SUBSAMP.) Refer to @ref YUVnotes |
| * "YUV Image Format Notes" for more details. |
| * |
| * @param strides an array of integers, each specifying the number of bytes per |
| * row in the corresponding plane of the YUV source image. Setting the stride |
| * for any plane to 0 is the same as setting it to the plane width (see |
| * @ref YUVnotes "YUV Image Format Notes".) If `strides` is NULL, then the |
| * strides for all planes will be set to their respective plane widths. You |
| * can adjust the strides in order to specify an arbitrary amount of row |
| * padding in each plane or to decode a subregion of a larger planar YUV image. |
| * |
| * @param dstBuf pointer to a buffer that will receive the packed-pixel decoded |
| * image. This buffer should normally be `pitch * height` bytes in size. |
| * However, you can also use this parameter to decode into a specific region of |
| * a larger buffer. |
| * |
| * @param width width (in pixels) of the source and destination images |
| * |
| * @param pitch bytes per row in the destination image. Normally this should |
| * be set to <tt>width * #tjPixelSize[pixelFormat]</tt>, if the destination |
| * image should be unpadded. (Setting this parameter to 0 is the equivalent of |
| * setting it to <tt>width * #tjPixelSize[pixelFormat]</tt>.) However, you can |
| * also use this parameter to specify the row alignment/padding of the |
| * destination image, to skip rows, or to decode into a specific region of a |
| * larger buffer. |
| * |
| * @param height height (in pixels) of the source and destination images |
| * |
| * @param pixelFormat pixel format of the destination image (see @ref TJPF |
| * "Pixel formats".) |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3DecodeYUVPlanes8(tjhandle handle, |
| const unsigned char * const *srcPlanes, |
| const int *strides, unsigned char *dstBuf, |
| int width, int pitch, int height, |
| int pixelFormat); |
| |
| |
| /** |
| * Losslessly transform a JPEG image into another JPEG image. Lossless |
| * transforms work by moving the raw DCT coefficients from one JPEG image |
| * structure to another without altering the values of the coefficients. While |
| * this is typically faster than decompressing the image, transforming it, and |
| * re-compressing it, lossless transforms are not free. Each lossless |
| * transform requires reading and performing entropy decoding on all of the |
| * coefficients in the source image, regardless of the size of the destination |
| * image. Thus, this function provides a means of generating multiple |
| * transformed images from the same source or applying multiple transformations |
| * simultaneously, in order to eliminate the need to read the source |
| * coefficients multiple times. |
| * |
| * @param handle handle to a TurboJPEG instance that has been initialized for |
| * lossless transformation |
| * |
| * @param jpegBuf pointer to a byte buffer containing the JPEG source image to |
| * transform |
| * |
| * @param jpegSize size of the JPEG source image (in bytes) |
| * |
| * @param n the number of transformed JPEG images to generate |
| * |
| * @param dstBufs pointer to an array of n byte buffers. `dstBufs[i]` will |
| * receive a JPEG image that has been transformed using the parameters in |
| * `transforms[i]`. TurboJPEG has the ability to reallocate the JPEG |
| * destination buffer to accommodate the size of the transformed JPEG image. |
| * Thus, you can choose to: |
| * -# pre-allocate the JPEG destination buffer with an arbitrary size using |
| * #tj3Alloc() and let TurboJPEG grow the buffer as needed, |
| * -# set `dstBufs[i]` to NULL to tell TurboJPEG to allocate the buffer for |
| * you, or |
| * -# pre-allocate the buffer to a "worst case" size determined by calling |
| * #tj3JPEGBufSize() with the transformed or cropped width and height. Under |
| * normal circumstances, this should ensure that the buffer never has to be |
| * re-allocated. (Setting #TJPARAM_NOREALLOC guarantees that it won't be.) |
| * Note, however, that there are some rare cases (such as transforming images |
| * with a large amount of embedded EXIF or ICC profile data) in which the |
| * transformed JPEG image will be larger than the worst-case size, and |
| * #TJPARAM_NOREALLOC cannot be used in those cases. |
| * . |
| * If you choose option 1, then `dstSizes[i]` should be set to the size of your |
| * pre-allocated buffer. In any case, unless you have set #TJPARAM_NOREALLOC, |
| * you should always check `dstBufs[i]` upon return from this function, as it |
| * may have changed. |
| * |
| * @param dstSizes pointer to an array of n size_t variables that will receive |
| * the actual sizes (in bytes) of each transformed JPEG image. If `dstBufs[i]` |
| * points to a pre-allocated buffer, then `dstSizes[i]` should be set to the |
| * size of the buffer. Upon return, `dstSizes[i]` will contain the size of the |
| * transformed JPEG image (in bytes.) |
| * |
| * @param transforms pointer to an array of n #tjtransform structures, each of |
| * which specifies the transform parameters and/or cropping region for the |
| * corresponding transformed JPEG image. |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr() |
| * and #tj3GetErrorCode().) |
| */ |
| DLLEXPORT int tj3Transform(tjhandle handle, const unsigned char *jpegBuf, |
| size_t jpegSize, int n, unsigned char **dstBufs, |
| size_t *dstSizes, const tjtransform *transforms); |
| |
| |
| /** |
| * Destroy a TurboJPEG instance. |
| * |
| * @param handle handle to a TurboJPEG instance. If the handle is NULL, then |
| * this function has no effect. |
| */ |
| DLLEXPORT void tj3Destroy(tjhandle handle); |
| |
| |
| /** |
| * Allocate a byte buffer for use with TurboJPEG. You should always use this |
| * function to allocate the JPEG destination buffer(s) for the compression and |
| * transform functions unless you are disabling automatic buffer (re)allocation |
| * (by setting #TJPARAM_NOREALLOC.) |
| * |
| * @param bytes the number of bytes to allocate |
| * |
| * @return a pointer to a newly-allocated buffer with the specified number of |
| * bytes. |
| * |
| * @see tj3Free() |
| */ |
| DLLEXPORT void *tj3Alloc(size_t bytes); |
| |
| |
| /** |
| * Load an 8-bit-per-sample packed-pixel image from disk into memory. |
| * |
| * @param handle handle to a TurboJPEG instance |
| * |
| * @param filename name of a file containing a packed-pixel image in Windows |
| * BMP or PBMPLUS (PPM/PGM) format. Windows BMP files require 8-bit-per-sample |
| * data precision. If the data precision of the PBMPLUS file does not match |
| * the target data precision, then upconverting or downconverting will be |
| * performed. |
| * |
| * @param width pointer to an integer variable that will receive the width (in |
| * pixels) of the packed-pixel image |
| * |
| * @param align row alignment (in samples) of the packed-pixel buffer to be |
| * returned (must be a power of 2.) Setting this parameter to n will cause all |
| * rows in the buffer to be padded to the nearest multiple of n samples |
| * (1 = unpadded.) |
| * |
| * @param height pointer to an integer variable that will receive the height |
| * (in pixels) of the packed-pixel image |
| * |
| * @param pixelFormat pointer to an integer variable that specifies or will |
| * receive the pixel format of the packed-pixel buffer. The behavior of this |
| * function will vary depending on the value of `*pixelFormat` passed to the |
| * function: |
| * - @ref TJPF_UNKNOWN : The packed-pixel buffer returned by this function will |
| * use the most optimal pixel format for the file type, and `*pixelFormat` will |
| * contain the ID of that pixel format upon successful return from this |
| * function. |
| * - @ref TJPF_GRAY : Only PGM files and 8-bit-per-pixel BMP files with a |
| * grayscale colormap can be loaded. |
| * - @ref TJPF_CMYK : The RGB or grayscale pixels stored in the file will be |
| * converted using a quick & dirty algorithm that is suitable only for testing |
| * purposes. (Proper conversion between CMYK and other formats requires a |
| * color management system.) |
| * - Other @ref TJPF "pixel formats" : The packed-pixel buffer will use the |
| * specified pixel format, and pixel format conversion will be performed if |
| * necessary. |
| * |
| * @return a pointer to a newly-allocated buffer containing the packed-pixel |
| * image, converted to the chosen pixel format and with the chosen row |
| * alignment, or NULL if an error occurred (see #tj3GetErrorStr().) This |
| * buffer should be freed using #tj3Free(). |
| */ |
| DLLEXPORT unsigned char *tj3LoadImage8(tjhandle handle, const char *filename, |
| int *width, int align, int *height, |
| int *pixelFormat); |
| |
| /** |
| * Load a 12-bit-per-sample packed-pixel image from disk into memory. |
| * |
| * \details \copydetails tj3LoadImage8() |
| */ |
| DLLEXPORT short *tj3LoadImage12(tjhandle handle, const char *filename, |
| int *width, int align, int *height, |
| int *pixelFormat); |
| |
| /** |
| * Load a 16-bit-per-sample packed-pixel image from disk into memory. |
| * |
| * \details \copydetails tj3LoadImage8() |
| */ |
| DLLEXPORT unsigned short *tj3LoadImage16(tjhandle handle, const char *filename, |
| int *width, int align, int *height, |
| int *pixelFormat); |
| |
| |
| /** |
| * Save an 8-bit-per-sample packed-pixel image from memory to disk. |
| * |
| * @param handle handle to a TurboJPEG instance |
| * |
| * @param filename name of a file to which to save the packed-pixel image. The |
| * image will be stored in Windows BMP or PBMPLUS (PPM/PGM) format, depending |
| * on the file extension. Windows BMP files require 8-bit-per-sample data |
| * precision. |
| * |
| * @param buffer pointer to a buffer containing a packed-pixel RGB, grayscale, |
| * or CMYK image to be saved |
| * |
| * @param width width (in pixels) of the packed-pixel image |
| * |
| * @param pitch samples per row in the packed-pixel image. Setting this |
| * parameter to 0 is the equivalent of setting it to |
| * <tt>width * #tjPixelSize[pixelFormat]</tt>. |
| * |
| * @param height height (in pixels) of the packed-pixel image |
| * |
| * @param pixelFormat pixel format of the packed-pixel image (see @ref TJPF |
| * "Pixel formats".) If this parameter is set to @ref TJPF_GRAY, then the |
| * image will be stored in PGM or 8-bit-per-pixel (indexed color) BMP format. |
| * Otherwise, the image will be stored in PPM or 24-bit-per-pixel BMP format. |
| * If this parameter is set to @ref TJPF_CMYK, then the CMYK pixels will be |
| * converted to RGB using a quick & dirty algorithm that is suitable only for |
| * testing purposes. (Proper conversion between CMYK and other formats |
| * requires a color management system.) |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tj3GetErrorStr().) |
| */ |
| DLLEXPORT int tj3SaveImage8(tjhandle handle, const char *filename, |
| const unsigned char *buffer, int width, int pitch, |
| int height, int pixelFormat); |
| |
| /** |
| * Save a 12-bit-per-sample packed-pixel image from memory to disk. |
| * |
| * \details \copydetails tj3SaveImage8() |
| */ |
| DLLEXPORT int tj3SaveImage12(tjhandle handle, const char *filename, |
| const short *buffer, int width, int pitch, |
| int height, int pixelFormat); |
| |
| /** |
| * Save a 16-bit-per-sample packed-pixel image from memory to disk. |
| * |
| * \details \copydetails tj3SaveImage8() |
| */ |
| DLLEXPORT int tj3SaveImage16(tjhandle handle, const char *filename, |
| const unsigned short *buffer, int width, |
| int pitch, int height, int pixelFormat); |
| |
| |
| /** |
| * Free a byte buffer previously allocated by TurboJPEG. You should always use |
| * this function to free JPEG destination buffer(s) that were automatically |
| * (re)allocated by the compression and transform functions or that were |
| * manually allocated using #tj3Alloc(). |
| * |
| * @param buffer address of the buffer to free. If the address is NULL, then |
| * this function has no effect. |
| * |
| * @see tj3Alloc() |
| */ |
| DLLEXPORT void tj3Free(void *buffer); |
| |
| |
| /** |
| * Returns a descriptive error message explaining why the last command failed. |
| * |
| * @param handle handle to a TurboJPEG instance, or NULL if the error was |
| * generated by a global function (but note that retrieving the error message |
| * for a global function is thread-safe only on platforms that support |
| * thread-local storage.) |
| * |
| * @return a descriptive error message explaining why the last command failed. |
| */ |
| DLLEXPORT char *tj3GetErrorStr(tjhandle handle); |
| |
| |
| /** |
| * Returns a code indicating the severity of the last error. See |
| * @ref TJERR "Error codes". |
| * |
| * @param handle handle to a TurboJPEG instance |
| * |
| * @return a code indicating the severity of the last error. See |
| * @ref TJERR "Error codes". |
| */ |
| DLLEXPORT int tj3GetErrorCode(tjhandle handle); |
| |
| |
| /* Backward compatibility functions and macros (nothing to see here) */ |
| |
| /* TurboJPEG 1.0+ */ |
| |
| #define NUMSUBOPT TJ_NUMSAMP |
| #define TJ_444 TJSAMP_444 |
| #define TJ_422 TJSAMP_422 |
| #define TJ_420 TJSAMP_420 |
| #define TJ_411 TJSAMP_420 |
| #define TJ_GRAYSCALE TJSAMP_GRAY |
| |
| #define TJ_BGR 1 |
| #define TJ_BOTTOMUP TJFLAG_BOTTOMUP |
| #define TJ_FORCEMMX TJFLAG_FORCEMMX |
| #define TJ_FORCESSE TJFLAG_FORCESSE |
| #define TJ_FORCESSE2 TJFLAG_FORCESSE2 |
| #define TJ_ALPHAFIRST 64 |
| #define TJ_FORCESSE3 TJFLAG_FORCESSE3 |
| #define TJ_FASTUPSAMPLE TJFLAG_FASTUPSAMPLE |
| |
| #define TJPAD(width) (((width) + 3) & (~3)) |
| |
| DLLEXPORT unsigned long TJBUFSIZE(int width, int height); |
| |
| DLLEXPORT int tjCompress(tjhandle handle, unsigned char *srcBuf, int width, |
| int pitch, int height, int pixelSize, |
| unsigned char *dstBuf, unsigned long *compressedSize, |
| int jpegSubsamp, int jpegQual, int flags); |
| |
| DLLEXPORT int tjDecompress(tjhandle handle, unsigned char *jpegBuf, |
| unsigned long jpegSize, unsigned char *dstBuf, |
| int width, int pitch, int height, int pixelSize, |
| int flags); |
| |
| DLLEXPORT int tjDecompressHeader(tjhandle handle, unsigned char *jpegBuf, |
| unsigned long jpegSize, int *width, |
| int *height); |
| |
| DLLEXPORT int tjDestroy(tjhandle handle); |
| |
| DLLEXPORT char *tjGetErrorStr(void); |
| |
| DLLEXPORT tjhandle tjInitCompress(void); |
| |
| DLLEXPORT tjhandle tjInitDecompress(void); |
| |
| /* TurboJPEG 1.1+ */ |
| |
| #define TJ_YUV 512 |
| |
| DLLEXPORT unsigned long TJBUFSIZEYUV(int width, int height, int jpegSubsamp); |
| |
| DLLEXPORT int tjDecompressHeader2(tjhandle handle, unsigned char *jpegBuf, |
| unsigned long jpegSize, int *width, |
| int *height, int *jpegSubsamp); |
| |
| DLLEXPORT int tjDecompressToYUV(tjhandle handle, unsigned char *jpegBuf, |
| unsigned long jpegSize, unsigned char *dstBuf, |
| int flags); |
| |
| DLLEXPORT int tjEncodeYUV(tjhandle handle, unsigned char *srcBuf, int width, |
| int pitch, int height, int pixelSize, |
| unsigned char *dstBuf, int subsamp, int flags); |
| |
| /* TurboJPEG 1.2+ */ |
| |
| #define TJFLAG_BOTTOMUP 2 |
| #define TJFLAG_FORCEMMX 8 |
| #define TJFLAG_FORCESSE 16 |
| #define TJFLAG_FORCESSE2 32 |
| #define TJFLAG_FORCESSE3 128 |
| #define TJFLAG_FASTUPSAMPLE 256 |
| #define TJFLAG_NOREALLOC 1024 |
| |
| DLLEXPORT unsigned char *tjAlloc(int bytes); |
| |
| DLLEXPORT unsigned long tjBufSize(int width, int height, int jpegSubsamp); |
| |
| DLLEXPORT unsigned long tjBufSizeYUV(int width, int height, int subsamp); |
| |
| DLLEXPORT int tjCompress2(tjhandle handle, const unsigned char *srcBuf, |
| int width, int pitch, int height, int pixelFormat, |
| unsigned char **jpegBuf, unsigned long *jpegSize, |
| int jpegSubsamp, int jpegQual, int flags); |
| |
| DLLEXPORT int tjDecompress2(tjhandle handle, const unsigned char *jpegBuf, |
| unsigned long jpegSize, unsigned char *dstBuf, |
| int width, int pitch, int height, int pixelFormat, |
| int flags); |
| |
| DLLEXPORT int tjEncodeYUV2(tjhandle handle, unsigned char *srcBuf, int width, |
| int pitch, int height, int pixelFormat, |
| unsigned char *dstBuf, int subsamp, int flags); |
| |
| DLLEXPORT void tjFree(unsigned char *buffer); |
| |
| DLLEXPORT tjscalingfactor *tjGetScalingFactors(int *numscalingfactors); |
| |
| DLLEXPORT tjhandle tjInitTransform(void); |
| |
| DLLEXPORT int tjTransform(tjhandle handle, const unsigned char *jpegBuf, |
| unsigned long jpegSize, int n, |
| unsigned char **dstBufs, unsigned long *dstSizes, |
| tjtransform *transforms, int flags); |
| |
| /* TurboJPEG 1.2.1+ */ |
| |
| #define TJFLAG_FASTDCT 2048 |
| #define TJFLAG_ACCURATEDCT 4096 |
| |
| /* TurboJPEG 1.4+ */ |
| |
| DLLEXPORT unsigned long tjBufSizeYUV2(int width, int align, int height, |
| int subsamp); |
| |
| DLLEXPORT int tjCompressFromYUV(tjhandle handle, const unsigned char *srcBuf, |
| int width, int align, int height, int subsamp, |
| unsigned char **jpegBuf, |
| unsigned long *jpegSize, int jpegQual, |
| int flags); |
| |
| DLLEXPORT int tjCompressFromYUVPlanes(tjhandle handle, |
| const unsigned char **srcPlanes, |
| int width, const int *strides, |
| int height, int subsamp, |
| unsigned char **jpegBuf, |
| unsigned long *jpegSize, int jpegQual, |
| int flags); |
| |
| DLLEXPORT int tjDecodeYUV(tjhandle handle, const unsigned char *srcBuf, |
| int align, int subsamp, unsigned char *dstBuf, |
| int width, int pitch, int height, int pixelFormat, |
| int flags); |
| |
| DLLEXPORT int tjDecodeYUVPlanes(tjhandle handle, |
| const unsigned char **srcPlanes, |
| const int *strides, int subsamp, |
| unsigned char *dstBuf, int width, int pitch, |
| int height, int pixelFormat, int flags); |
| |
| DLLEXPORT int tjDecompressHeader3(tjhandle handle, |
| const unsigned char *jpegBuf, |
| unsigned long jpegSize, int *width, |
| int *height, int *jpegSubsamp, |
| int *jpegColorspace); |
| |
| DLLEXPORT int tjDecompressToYUV2(tjhandle handle, const unsigned char *jpegBuf, |
| unsigned long jpegSize, unsigned char *dstBuf, |
| int width, int align, int height, int flags); |
| |
| DLLEXPORT int tjDecompressToYUVPlanes(tjhandle handle, |
| const unsigned char *jpegBuf, |
| unsigned long jpegSize, |
| unsigned char **dstPlanes, int width, |
| int *strides, int height, int flags); |
| |
| DLLEXPORT int tjEncodeYUV3(tjhandle handle, const unsigned char *srcBuf, |
| int width, int pitch, int height, int pixelFormat, |
| unsigned char *dstBuf, int align, int subsamp, |
| int flags); |
| |
| DLLEXPORT int tjEncodeYUVPlanes(tjhandle handle, const unsigned char *srcBuf, |
| int width, int pitch, int height, |
| int pixelFormat, unsigned char **dstPlanes, |
| int *strides, int subsamp, int flags); |
| |
| DLLEXPORT int tjPlaneHeight(int componentID, int height, int subsamp); |
| |
| DLLEXPORT unsigned long tjPlaneSizeYUV(int componentID, int width, int stride, |
| int height, int subsamp); |
| |
| DLLEXPORT int tjPlaneWidth(int componentID, int width, int subsamp); |
| |
| /* TurboJPEG 2.0+ */ |
| |
| #define TJFLAG_STOPONWARNING 8192 |
| #define TJFLAG_PROGRESSIVE 16384 |
| |
| DLLEXPORT int tjGetErrorCode(tjhandle handle); |
| |
| DLLEXPORT char *tjGetErrorStr2(tjhandle handle); |
| |
| DLLEXPORT unsigned char *tjLoadImage(const char *filename, int *width, |
| int align, int *height, int *pixelFormat, |
| int flags); |
| |
| DLLEXPORT int tjSaveImage(const char *filename, unsigned char *buffer, |
| int width, int pitch, int height, int pixelFormat, |
| int flags); |
| |
| /* TurboJPEG 2.1+ */ |
| |
| #define TJFLAG_LIMITSCANS 32768 |
| |
| /** |
| * @} |
| */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif |
