| /* |
| * rdbmp.c |
| * |
| * This file was part of the Independent JPEG Group's software: |
| * Copyright (C) 1994-1996, Thomas G. Lane. |
| * Modified 2009-2017 by Guido Vollbeding. |
| * libjpeg-turbo Modifications: |
| * Modified 2011 by Siarhei Siamashka. |
| * Copyright (C) 2015, 2017-2018, D. R. Commander. |
| * For conditions of distribution and use, see the accompanying README.ijg |
| * file. |
| * |
| * This file contains routines to read input images in Microsoft "BMP" |
| * format (MS Windows 3.x, OS/2 1.x, and OS/2 2.x flavors). |
| * Currently, only 8-, 24-, and 32-bit images are supported, not 1-bit or |
| * 4-bit (feeding such low-depth images into JPEG would be silly anyway). |
| * Also, we don't support RLE-compressed files. |
| * |
| * These routines may need modification for non-Unix environments or |
| * specialized applications. As they stand, they assume input from |
| * an ordinary stdio stream. They further assume that reading begins |
| * at the start of the file; start_input may need work if the |
| * user interface has already read some data (e.g., to determine that |
| * the file is indeed BMP format). |
| * |
| * This code contributed by James Arthur Boucher. |
| */ |
| |
| #include "cmyk.h" |
| #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
| |
| #ifdef BMP_SUPPORTED |
| |
| |
| /* Macros to deal with unsigned chars as efficiently as compiler allows */ |
| |
| typedef unsigned char U_CHAR; |
| #define UCH(x) ((int)(x)) |
| |
| |
| #define ReadOK(file, buffer, len) \ |
| (JFREAD(file, buffer, len) == ((size_t)(len))) |
| |
| static int alpha_index[JPEG_NUMCS] = { |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 3, 3, 0, 0, -1 |
| }; |
| |
| |
| /* Private version of data source object */ |
| |
| typedef struct _bmp_source_struct *bmp_source_ptr; |
| |
| typedef struct _bmp_source_struct { |
| struct cjpeg_source_struct pub; /* public fields */ |
| |
| j_compress_ptr cinfo; /* back link saves passing separate parm */ |
| |
| JSAMPARRAY colormap; /* BMP colormap (converted to my format) */ |
| |
| jvirt_sarray_ptr whole_image; /* Needed to reverse row order */ |
| JDIMENSION source_row; /* Current source row number */ |
| JDIMENSION row_width; /* Physical width of scanlines in file */ |
| |
| int bits_per_pixel; /* remembers 8-, 24-, or 32-bit format */ |
| int cmap_length; /* colormap length */ |
| |
| boolean use_inversion_array; /* TRUE = preload the whole image, which is |
| stored in bottom-up order, and feed it to |
| the calling program in top-down order |
| |
| FALSE = the calling program will maintain |
| its own image buffer and read the rows in |
| bottom-up order */ |
| |
| U_CHAR *iobuffer; /* I/O buffer (used to buffer a single row from |
| disk if use_inversion_array == FALSE) */ |
| } bmp_source_struct; |
| |
| |
| LOCAL(int) |
| read_byte(bmp_source_ptr sinfo) |
| /* Read next byte from BMP file */ |
| { |
| register FILE *infile = sinfo->pub.input_file; |
| register int c; |
| |
| if ((c = getc(infile)) == EOF) |
| ERREXIT(sinfo->cinfo, JERR_INPUT_EOF); |
| return c; |
| } |
| |
| |
| LOCAL(void) |
| read_colormap(bmp_source_ptr sinfo, int cmaplen, int mapentrysize) |
| /* Read the colormap from a BMP file */ |
| { |
| int i, gray = 1; |
| |
| switch (mapentrysize) { |
| case 3: |
| /* BGR format (occurs in OS/2 files) */ |
| for (i = 0; i < cmaplen; i++) { |
| sinfo->colormap[2][i] = (JSAMPLE)read_byte(sinfo); |
| sinfo->colormap[1][i] = (JSAMPLE)read_byte(sinfo); |
| sinfo->colormap[0][i] = (JSAMPLE)read_byte(sinfo); |
| if (sinfo->colormap[2][i] != sinfo->colormap[1][i] || |
| sinfo->colormap[1][i] != sinfo->colormap[0][i]) |
| gray = 0; |
| } |
| break; |
| case 4: |
| /* BGR0 format (occurs in MS Windows files) */ |
| for (i = 0; i < cmaplen; i++) { |
| sinfo->colormap[2][i] = (JSAMPLE)read_byte(sinfo); |
| sinfo->colormap[1][i] = (JSAMPLE)read_byte(sinfo); |
| sinfo->colormap[0][i] = (JSAMPLE)read_byte(sinfo); |
| (void)read_byte(sinfo); |
| if (sinfo->colormap[2][i] != sinfo->colormap[1][i] || |
| sinfo->colormap[1][i] != sinfo->colormap[0][i]) |
| gray = 0; |
| } |
| break; |
| default: |
| ERREXIT(sinfo->cinfo, JERR_BMP_BADCMAP); |
| break; |
| } |
| |
| if (sinfo->cinfo->in_color_space == JCS_UNKNOWN && gray) |
| sinfo->cinfo->in_color_space = JCS_GRAYSCALE; |
| |
| if (sinfo->cinfo->in_color_space == JCS_GRAYSCALE && !gray) |
| ERREXIT(sinfo->cinfo, JERR_BAD_IN_COLORSPACE); |
| } |
| |
| |
| /* |
| * Read one row of pixels. |
| * The image has been read into the whole_image array, but is otherwise |
| * unprocessed. We must read it out in top-to-bottom row order, and if |
| * it is an 8-bit image, we must expand colormapped pixels to 24bit format. |
| */ |
| |
| METHODDEF(JDIMENSION) |
| get_8bit_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| /* This version is for reading 8-bit colormap indexes */ |
| { |
| bmp_source_ptr source = (bmp_source_ptr)sinfo; |
| register JSAMPARRAY colormap = source->colormap; |
| int cmaplen = source->cmap_length; |
| JSAMPARRAY image_ptr; |
| register int t; |
| register JSAMPROW inptr, outptr; |
| register JDIMENSION col; |
| |
| if (source->use_inversion_array) { |
| /* Fetch next row from virtual array */ |
| source->source_row--; |
| image_ptr = (*cinfo->mem->access_virt_sarray) |
| ((j_common_ptr)cinfo, source->whole_image, |
| source->source_row, (JDIMENSION)1, FALSE); |
| inptr = image_ptr[0]; |
| } else { |
| if (!ReadOK(source->pub.input_file, source->iobuffer, source->row_width)) |
| ERREXIT(cinfo, JERR_INPUT_EOF); |
| inptr = source->iobuffer; |
| } |
| |
| /* Expand the colormap indexes to real data */ |
| outptr = source->pub.buffer[0]; |
| if (cinfo->in_color_space == JCS_GRAYSCALE) { |
| for (col = cinfo->image_width; col > 0; col--) { |
| t = *inptr++; |
| if (t >= cmaplen) |
| ERREXIT(cinfo, JERR_BMP_OUTOFRANGE); |
| *outptr++ = colormap[0][t]; |
| } |
| } else if (cinfo->in_color_space == JCS_CMYK) { |
| for (col = cinfo->image_width; col > 0; col--) { |
| t = *inptr++; |
| if (t >= cmaplen) |
| ERREXIT(cinfo, JERR_BMP_OUTOFRANGE); |
| rgb_to_cmyk(colormap[0][t], colormap[1][t], colormap[2][t], outptr, |
| outptr + 1, outptr + 2, outptr + 3); |
| outptr += 4; |
| } |
| } else { |
| register int rindex = rgb_red[cinfo->in_color_space]; |
| register int gindex = rgb_green[cinfo->in_color_space]; |
| register int bindex = rgb_blue[cinfo->in_color_space]; |
| register int aindex = alpha_index[cinfo->in_color_space]; |
| register int ps = rgb_pixelsize[cinfo->in_color_space]; |
| |
| if (aindex >= 0) { |
| for (col = cinfo->image_width; col > 0; col--) { |
| t = *inptr++; |
| if (t >= cmaplen) |
| ERREXIT(cinfo, JERR_BMP_OUTOFRANGE); |
| outptr[rindex] = colormap[0][t]; |
| outptr[gindex] = colormap[1][t]; |
| outptr[bindex] = colormap[2][t]; |
| outptr[aindex] = 0xFF; |
| outptr += ps; |
| } |
| } else { |
| for (col = cinfo->image_width; col > 0; col--) { |
| t = *inptr++; |
| if (t >= cmaplen) |
| ERREXIT(cinfo, JERR_BMP_OUTOFRANGE); |
| outptr[rindex] = colormap[0][t]; |
| outptr[gindex] = colormap[1][t]; |
| outptr[bindex] = colormap[2][t]; |
| outptr += ps; |
| } |
| } |
| } |
| |
| return 1; |
| } |
| |
| |
| METHODDEF(JDIMENSION) |
| get_24bit_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| /* This version is for reading 24-bit pixels */ |
| { |
| bmp_source_ptr source = (bmp_source_ptr)sinfo; |
| JSAMPARRAY image_ptr; |
| register JSAMPROW inptr, outptr; |
| register JDIMENSION col; |
| |
| if (source->use_inversion_array) { |
| /* Fetch next row from virtual array */ |
| source->source_row--; |
| image_ptr = (*cinfo->mem->access_virt_sarray) |
| ((j_common_ptr)cinfo, source->whole_image, |
| source->source_row, (JDIMENSION)1, FALSE); |
| inptr = image_ptr[0]; |
| } else { |
| if (!ReadOK(source->pub.input_file, source->iobuffer, source->row_width)) |
| ERREXIT(cinfo, JERR_INPUT_EOF); |
| inptr = source->iobuffer; |
| } |
| |
| /* Transfer data. Note source values are in BGR order |
| * (even though Microsoft's own documents say the opposite). |
| */ |
| outptr = source->pub.buffer[0]; |
| if (cinfo->in_color_space == JCS_EXT_BGR) { |
| MEMCOPY(outptr, inptr, source->row_width); |
| } else if (cinfo->in_color_space == JCS_CMYK) { |
| for (col = cinfo->image_width; col > 0; col--) { |
| JSAMPLE b = *inptr++, g = *inptr++, r = *inptr++; |
| rgb_to_cmyk(r, g, b, outptr, outptr + 1, outptr + 2, outptr + 3); |
| outptr += 4; |
| } |
| } else { |
| register int rindex = rgb_red[cinfo->in_color_space]; |
| register int gindex = rgb_green[cinfo->in_color_space]; |
| register int bindex = rgb_blue[cinfo->in_color_space]; |
| register int aindex = alpha_index[cinfo->in_color_space]; |
| register int ps = rgb_pixelsize[cinfo->in_color_space]; |
| |
| if (aindex >= 0) { |
| for (col = cinfo->image_width; col > 0; col--) { |
| outptr[bindex] = *inptr++; |
| outptr[gindex] = *inptr++; |
| outptr[rindex] = *inptr++; |
| outptr[aindex] = 0xFF; |
| outptr += ps; |
| } |
| } else { |
| for (col = cinfo->image_width; col > 0; col--) { |
| outptr[bindex] = *inptr++; |
| outptr[gindex] = *inptr++; |
| outptr[rindex] = *inptr++; |
| outptr += ps; |
| } |
| } |
| } |
| |
| return 1; |
| } |
| |
| |
| METHODDEF(JDIMENSION) |
| get_32bit_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| /* This version is for reading 32-bit pixels */ |
| { |
| bmp_source_ptr source = (bmp_source_ptr)sinfo; |
| JSAMPARRAY image_ptr; |
| register JSAMPROW inptr, outptr; |
| register JDIMENSION col; |
| |
| if (source->use_inversion_array) { |
| /* Fetch next row from virtual array */ |
| source->source_row--; |
| image_ptr = (*cinfo->mem->access_virt_sarray) |
| ((j_common_ptr)cinfo, source->whole_image, |
| source->source_row, (JDIMENSION)1, FALSE); |
| inptr = image_ptr[0]; |
| } else { |
| if (!ReadOK(source->pub.input_file, source->iobuffer, source->row_width)) |
| ERREXIT(cinfo, JERR_INPUT_EOF); |
| inptr = source->iobuffer; |
| } |
| |
| /* Transfer data. Note source values are in BGR order |
| * (even though Microsoft's own documents say the opposite). |
| */ |
| outptr = source->pub.buffer[0]; |
| if (cinfo->in_color_space == JCS_EXT_BGRX || |
| cinfo->in_color_space == JCS_EXT_BGRA) { |
| MEMCOPY(outptr, inptr, source->row_width); |
| } else if (cinfo->in_color_space == JCS_CMYK) { |
| for (col = cinfo->image_width; col > 0; col--) { |
| JSAMPLE b = *inptr++, g = *inptr++, r = *inptr++; |
| rgb_to_cmyk(r, g, b, outptr, outptr + 1, outptr + 2, outptr + 3); |
| inptr++; /* skip the 4th byte (Alpha channel) */ |
| outptr += 4; |
| } |
| } else { |
| register int rindex = rgb_red[cinfo->in_color_space]; |
| register int gindex = rgb_green[cinfo->in_color_space]; |
| register int bindex = rgb_blue[cinfo->in_color_space]; |
| register int aindex = alpha_index[cinfo->in_color_space]; |
| register int ps = rgb_pixelsize[cinfo->in_color_space]; |
| |
| if (aindex >= 0) { |
| for (col = cinfo->image_width; col > 0; col--) { |
| outptr[bindex] = *inptr++; |
| outptr[gindex] = *inptr++; |
| outptr[rindex] = *inptr++; |
| outptr[aindex] = *inptr++; |
| outptr += ps; |
| } |
| } else { |
| for (col = cinfo->image_width; col > 0; col--) { |
| outptr[bindex] = *inptr++; |
| outptr[gindex] = *inptr++; |
| outptr[rindex] = *inptr++; |
| inptr++; /* skip the 4th byte (Alpha channel) */ |
| outptr += ps; |
| } |
| } |
| } |
| |
| return 1; |
| } |
| |
| |
| /* |
| * This method loads the image into whole_image during the first call on |
| * get_pixel_rows. The get_pixel_rows pointer is then adjusted to call |
| * get_8bit_row, get_24bit_row, or get_32bit_row on subsequent calls. |
| */ |
| |
| METHODDEF(JDIMENSION) |
| preload_image(j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| { |
| bmp_source_ptr source = (bmp_source_ptr)sinfo; |
| register FILE *infile = source->pub.input_file; |
| register JSAMPROW out_ptr; |
| JSAMPARRAY image_ptr; |
| JDIMENSION row; |
| cd_progress_ptr progress = (cd_progress_ptr)cinfo->progress; |
| |
| /* Read the data into a virtual array in input-file row order. */ |
| for (row = 0; row < cinfo->image_height; row++) { |
| if (progress != NULL) { |
| progress->pub.pass_counter = (long)row; |
| progress->pub.pass_limit = (long)cinfo->image_height; |
| (*progress->pub.progress_monitor) ((j_common_ptr)cinfo); |
| } |
| image_ptr = (*cinfo->mem->access_virt_sarray) |
| ((j_common_ptr)cinfo, source->whole_image, row, (JDIMENSION)1, TRUE); |
| out_ptr = image_ptr[0]; |
| if (fread(out_ptr, 1, source->row_width, infile) != source->row_width) { |
| if (feof(infile)) |
| ERREXIT(cinfo, JERR_INPUT_EOF); |
| else |
| ERREXIT(cinfo, JERR_FILE_READ); |
| } |
| } |
| if (progress != NULL) |
| progress->completed_extra_passes++; |
| |
| /* Set up to read from the virtual array in top-to-bottom order */ |
| switch (source->bits_per_pixel) { |
| case 8: |
| source->pub.get_pixel_rows = get_8bit_row; |
| break; |
| case 24: |
| source->pub.get_pixel_rows = get_24bit_row; |
| break; |
| case 32: |
| source->pub.get_pixel_rows = get_32bit_row; |
| break; |
| default: |
| ERREXIT(cinfo, JERR_BMP_BADDEPTH); |
| } |
| source->source_row = cinfo->image_height; |
| |
| /* And read the first row */ |
| return (*source->pub.get_pixel_rows) (cinfo, sinfo); |
| } |
| |
| |
| /* |
| * Read the file header; return image size and component count. |
| */ |
| |
| METHODDEF(void) |
| start_input_bmp(j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| { |
| bmp_source_ptr source = (bmp_source_ptr)sinfo; |
| U_CHAR bmpfileheader[14]; |
| U_CHAR bmpinfoheader[64]; |
| |
| #define GET_2B(array, offset) \ |
| ((unsigned short)UCH(array[offset]) + \ |
| (((unsigned short)UCH(array[offset + 1])) << 8)) |
| #define GET_4B(array, offset) \ |
| ((unsigned int)UCH(array[offset]) + \ |
| (((unsigned int)UCH(array[offset + 1])) << 8) + \ |
| (((unsigned int)UCH(array[offset + 2])) << 16) + \ |
| (((unsigned int)UCH(array[offset + 3])) << 24)) |
| |
| unsigned int bfOffBits; |
| unsigned int headerSize; |
| int biWidth; |
| int biHeight; |
| unsigned short biPlanes; |
| unsigned int biCompression; |
| int biXPelsPerMeter, biYPelsPerMeter; |
| unsigned int biClrUsed = 0; |
| int mapentrysize = 0; /* 0 indicates no colormap */ |
| int bPad; |
| JDIMENSION row_width = 0; |
| |
| /* Read and verify the bitmap file header */ |
| if (!ReadOK(source->pub.input_file, bmpfileheader, 14)) |
| ERREXIT(cinfo, JERR_INPUT_EOF); |
| if (GET_2B(bmpfileheader, 0) != 0x4D42) /* 'BM' */ |
| ERREXIT(cinfo, JERR_BMP_NOT); |
| bfOffBits = GET_4B(bmpfileheader, 10); |
| /* We ignore the remaining fileheader fields */ |
| |
| /* The infoheader might be 12 bytes (OS/2 1.x), 40 bytes (Windows), |
| * or 64 bytes (OS/2 2.x). Check the first 4 bytes to find out which. |
| */ |
| if (!ReadOK(source->pub.input_file, bmpinfoheader, 4)) |
| ERREXIT(cinfo, JERR_INPUT_EOF); |
| headerSize = GET_4B(bmpinfoheader, 0); |
| if (headerSize < 12 || headerSize > 64) |
| ERREXIT(cinfo, JERR_BMP_BADHEADER); |
| if (!ReadOK(source->pub.input_file, bmpinfoheader + 4, headerSize - 4)) |
| ERREXIT(cinfo, JERR_INPUT_EOF); |
| |
| switch (headerSize) { |
| case 12: |
| /* Decode OS/2 1.x header (Microsoft calls this a BITMAPCOREHEADER) */ |
| biWidth = (int)GET_2B(bmpinfoheader, 4); |
| biHeight = (int)GET_2B(bmpinfoheader, 6); |
| biPlanes = GET_2B(bmpinfoheader, 8); |
| source->bits_per_pixel = (int)GET_2B(bmpinfoheader, 10); |
| |
| switch (source->bits_per_pixel) { |
| case 8: /* colormapped image */ |
| mapentrysize = 3; /* OS/2 uses RGBTRIPLE colormap */ |
| TRACEMS2(cinfo, 1, JTRC_BMP_OS2_MAPPED, biWidth, biHeight); |
| break; |
| case 24: /* RGB image */ |
| case 32: /* RGB image + Alpha channel */ |
| TRACEMS3(cinfo, 1, JTRC_BMP_OS2, biWidth, biHeight, |
| source->bits_per_pixel); |
| break; |
| default: |
| ERREXIT(cinfo, JERR_BMP_BADDEPTH); |
| break; |
| } |
| break; |
| case 40: |
| case 64: |
| /* Decode Windows 3.x header (Microsoft calls this a BITMAPINFOHEADER) */ |
| /* or OS/2 2.x header, which has additional fields that we ignore */ |
| biWidth = (int)GET_4B(bmpinfoheader, 4); |
| biHeight = (int)GET_4B(bmpinfoheader, 8); |
| biPlanes = GET_2B(bmpinfoheader, 12); |
| source->bits_per_pixel = (int)GET_2B(bmpinfoheader, 14); |
| biCompression = GET_4B(bmpinfoheader, 16); |
| biXPelsPerMeter = (int)GET_4B(bmpinfoheader, 24); |
| biYPelsPerMeter = (int)GET_4B(bmpinfoheader, 28); |
| biClrUsed = GET_4B(bmpinfoheader, 32); |
| /* biSizeImage, biClrImportant fields are ignored */ |
| |
| switch (source->bits_per_pixel) { |
| case 8: /* colormapped image */ |
| mapentrysize = 4; /* Windows uses RGBQUAD colormap */ |
| TRACEMS2(cinfo, 1, JTRC_BMP_MAPPED, biWidth, biHeight); |
| break; |
| case 24: /* RGB image */ |
| case 32: /* RGB image + Alpha channel */ |
| TRACEMS3(cinfo, 1, JTRC_BMP, biWidth, biHeight, source->bits_per_pixel); |
| break; |
| default: |
| ERREXIT(cinfo, JERR_BMP_BADDEPTH); |
| break; |
| } |
| if (biCompression != 0) |
| ERREXIT(cinfo, JERR_BMP_COMPRESSED); |
| |
| if (biXPelsPerMeter > 0 && biYPelsPerMeter > 0) { |
| /* Set JFIF density parameters from the BMP data */ |
| cinfo->X_density = (UINT16)(biXPelsPerMeter / 100); /* 100 cm per meter */ |
| cinfo->Y_density = (UINT16)(biYPelsPerMeter / 100); |
| cinfo->density_unit = 2; /* dots/cm */ |
| } |
| break; |
| default: |
| ERREXIT(cinfo, JERR_BMP_BADHEADER); |
| return; |
| } |
| |
| if (biWidth <= 0 || biHeight <= 0) |
| ERREXIT(cinfo, JERR_BMP_EMPTY); |
| if (biPlanes != 1) |
| ERREXIT(cinfo, JERR_BMP_BADPLANES); |
| |
| /* Compute distance to bitmap data --- will adjust for colormap below */ |
| bPad = bfOffBits - (headerSize + 14); |
| |
| /* Read the colormap, if any */ |
| if (mapentrysize > 0) { |
| if (biClrUsed <= 0) |
| biClrUsed = 256; /* assume it's 256 */ |
| else if (biClrUsed > 256) |
| ERREXIT(cinfo, JERR_BMP_BADCMAP); |
| /* Allocate space to store the colormap */ |
| source->colormap = (*cinfo->mem->alloc_sarray) |
| ((j_common_ptr)cinfo, JPOOL_IMAGE, (JDIMENSION)biClrUsed, (JDIMENSION)3); |
| source->cmap_length = (int)biClrUsed; |
| /* and read it from the file */ |
| read_colormap(source, (int)biClrUsed, mapentrysize); |
| /* account for size of colormap */ |
| bPad -= biClrUsed * mapentrysize; |
| } |
| |
| /* Skip any remaining pad bytes */ |
| if (bPad < 0) /* incorrect bfOffBits value? */ |
| ERREXIT(cinfo, JERR_BMP_BADHEADER); |
| while (--bPad >= 0) { |
| (void)read_byte(source); |
| } |
| |
| /* Compute row width in file, including padding to 4-byte boundary */ |
| switch (source->bits_per_pixel) { |
| case 8: |
| if (cinfo->in_color_space == JCS_UNKNOWN) |
| cinfo->in_color_space = JCS_EXT_RGB; |
| if (IsExtRGB(cinfo->in_color_space)) |
| cinfo->input_components = rgb_pixelsize[cinfo->in_color_space]; |
| else if (cinfo->in_color_space == JCS_GRAYSCALE) |
| cinfo->input_components = 1; |
| else if (cinfo->in_color_space == JCS_CMYK) |
| cinfo->input_components = 4; |
| else |
| ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); |
| row_width = (JDIMENSION)biWidth; |
| break; |
| case 24: |
| if (cinfo->in_color_space == JCS_UNKNOWN) |
| cinfo->in_color_space = JCS_EXT_BGR; |
| if (IsExtRGB(cinfo->in_color_space)) |
| cinfo->input_components = rgb_pixelsize[cinfo->in_color_space]; |
| else if (cinfo->in_color_space == JCS_CMYK) |
| cinfo->input_components = 4; |
| else |
| ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); |
| row_width = (JDIMENSION)(biWidth * 3); |
| break; |
| case 32: |
| if (cinfo->in_color_space == JCS_UNKNOWN) |
| cinfo->in_color_space = JCS_EXT_BGRA; |
| if (IsExtRGB(cinfo->in_color_space)) |
| cinfo->input_components = rgb_pixelsize[cinfo->in_color_space]; |
| else if (cinfo->in_color_space == JCS_CMYK) |
| cinfo->input_components = 4; |
| else |
| ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); |
| row_width = (JDIMENSION)(biWidth * 4); |
| break; |
| default: |
| ERREXIT(cinfo, JERR_BMP_BADDEPTH); |
| } |
| while ((row_width & 3) != 0) row_width++; |
| source->row_width = row_width; |
| |
| if (source->use_inversion_array) { |
| /* Allocate space for inversion array, prepare for preload pass */ |
| source->whole_image = (*cinfo->mem->request_virt_sarray) |
| ((j_common_ptr)cinfo, JPOOL_IMAGE, FALSE, |
| row_width, (JDIMENSION)biHeight, (JDIMENSION)1); |
| source->pub.get_pixel_rows = preload_image; |
| if (cinfo->progress != NULL) { |
| cd_progress_ptr progress = (cd_progress_ptr)cinfo->progress; |
| progress->total_extra_passes++; /* count file input as separate pass */ |
| } |
| } else { |
| source->iobuffer = (U_CHAR *) |
| (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE, row_width); |
| switch (source->bits_per_pixel) { |
| case 8: |
| source->pub.get_pixel_rows = get_8bit_row; |
| break; |
| case 24: |
| source->pub.get_pixel_rows = get_24bit_row; |
| break; |
| case 32: |
| source->pub.get_pixel_rows = get_32bit_row; |
| break; |
| default: |
| ERREXIT(cinfo, JERR_BMP_BADDEPTH); |
| } |
| } |
| |
| /* Ensure that biWidth * cinfo->input_components doesn't exceed the maximum |
| value of the JDIMENSION type. This is only a danger with BMP files, since |
| their width and height fields are 32-bit integers. */ |
| if ((unsigned long long)biWidth * |
| (unsigned long long)cinfo->input_components > 0xFFFFFFFFULL) |
| ERREXIT(cinfo, JERR_WIDTH_OVERFLOW); |
| /* Allocate one-row buffer for returned data */ |
| source->pub.buffer = (*cinfo->mem->alloc_sarray) |
| ((j_common_ptr)cinfo, JPOOL_IMAGE, |
| (JDIMENSION)(biWidth * cinfo->input_components), (JDIMENSION)1); |
| source->pub.buffer_height = 1; |
| |
| cinfo->data_precision = 8; |
| cinfo->image_width = (JDIMENSION)biWidth; |
| cinfo->image_height = (JDIMENSION)biHeight; |
| } |
| |
| |
| /* |
| * Finish up at the end of the file. |
| */ |
| |
| METHODDEF(void) |
| finish_input_bmp(j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
| { |
| /* no work */ |
| } |
| |
| |
| /* |
| * The module selection routine for BMP format input. |
| */ |
| |
| GLOBAL(cjpeg_source_ptr) |
| jinit_read_bmp(j_compress_ptr cinfo, boolean use_inversion_array) |
| { |
| bmp_source_ptr source; |
| |
| /* Create module interface object */ |
| source = (bmp_source_ptr) |
| (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE, |
| sizeof(bmp_source_struct)); |
| source->cinfo = cinfo; /* make back link for subroutines */ |
| /* Fill in method ptrs, except get_pixel_rows which start_input sets */ |
| source->pub.start_input = start_input_bmp; |
| source->pub.finish_input = finish_input_bmp; |
| |
| source->use_inversion_array = use_inversion_array; |
| |
| return (cjpeg_source_ptr)source; |
| } |
| |
| #endif /* BMP_SUPPORTED */ |