| #Topic Image |
| #Alias Image_Reference ## |
| |
| #Class SkImage |
| |
| #Code |
| #Populate |
| ## |
| |
| Image describes a two dimensional array of pixels to draw. The pixels may be |
| decoded in a Raster_Bitmap, encoded in a Picture or compressed data stream, |
| or located in GPU memory as a GPU_Texture. |
| |
| Image cannot be modified after it is created. Image may allocate additional |
| storage as needed; for instance, an encoded Image may decode when drawn. |
| |
| Image width and height are greater than zero. Creating an Image with zero width |
| or height returns Image equal to nullptr. |
| |
| Image may be created from Bitmap, Pixmap, Surface, Picture, encoded streams, |
| GPU_Texture, YUV_ColorSpace data, or hardware buffer. Encoded streams supported |
| include BMP, GIF, HEIF, ICO, JPEG, PNG, WBMP, WebP. Supported encoding details |
| vary with platform. |
| |
| #Subtopic Raster_Image |
| #Alias Raster_Image ## |
| #Line # pixels decoded in Raster_Bitmap ## |
| Raster_Image pixels are decoded in a Raster_Bitmap. These pixels may be read |
| directly and in most cases written to, although edited pixels may not be drawn |
| if Image has been copied internally. |
| ## |
| |
| #Subtopic Texture_Image |
| #Line # pixels located on GPU ## |
| Texture_Image are located on GPU and pixels are not accessible. Texture_Image |
| are allocated optimally for best performance. Raster_Image may |
| be drawn to GPU_Surface, but pixels are uploaded from CPU to GPU downgrading |
| performance. |
| ## |
| |
| #Subtopic Lazy_Image |
| #Line # deferred pixel buffer ## |
| Lazy_Image defer allocating buffer for Image pixels and decoding stream until |
| Image is drawn. Lazy_Image caches result if possible to speed up repeated |
| drawing. |
| ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeRasterCopy(const SkPixmap& pixmap) |
| #In Constructors |
| #Line # creates Image from Pixmap and copied pixels ## |
| #Populate |
| |
| #Example |
| #Height 50 |
| #Description |
| Draw a five by five bitmap, and draw a copy in an Image. Editing the pixmap |
| alters the bitmap draw, but does not alter the Image draw since the Image |
| contains a copy of the pixels. |
| ## |
| uint8_t storage[][5] = {{ 0xCA, 0xDA, 0xCA, 0xC9, 0xA3 }, |
| { 0xAC, 0xA8, 0x89, 0xA7, 0x87 }, |
| { 0x9B, 0xB5, 0xE5, 0x95, 0x46 }, |
| { 0x90, 0x81, 0xC5, 0x71, 0x33 }, |
| { 0x75, 0x55, 0x44, 0x40, 0x30 }}; |
| SkImageInfo imageInfo = SkImageInfo::Make(5, 5, kGray_8_SkColorType, kOpaque_SkAlphaType); |
| SkPixmap pixmap(imageInfo, storage[0], sizeof(storage) / 5); |
| SkBitmap bitmap; |
| bitmap.installPixels(pixmap); |
| sk_sp<SkImage> image = SkImage::MakeRasterCopy(pixmap); |
| *pixmap.writable_addr8(2, 2) = 0x00; |
| canvas->scale(10, 10); |
| canvas->drawBitmap(bitmap, 0, 0); |
| canvas->drawImage(image, 10, 0); |
| ## |
| |
| #SeeAlso MakeRasterData MakeFromGenerator |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeRasterData(const SkImageInfo& info, sk_sp<SkData> pixels, size_t rowBytes) |
| #In Constructors |
| #Line # creates Image from Image_Info and shared pixels ## |
| #Populate |
| |
| #Example |
| #Image 3 |
| size_t rowBytes = image->width() * SkColorTypeBytesPerPixel(kRGBA_8888_SkColorType); |
| sk_sp<SkData> data = SkData::MakeUninitialized(rowBytes * image->height()); |
| SkImageInfo dstInfo = SkImageInfo::MakeN32(image->width(), image->height(), |
| kPremul_SkAlphaType); |
| image->readPixels(dstInfo, data->writable_data(), rowBytes, 0, 0, SkImage::kAllow_CachingHint); |
| sk_sp<SkImage> raw = SkImage::MakeRasterData(dstInfo.makeColorType(kRGBA_8888_SkColorType), |
| data, rowBytes); |
| canvas->drawImage(image, 0, 0); |
| canvas->drawImage(raw.get(), 128, 0); |
| ## |
| |
| #SeeAlso MakeRasterCopy MakeFromGenerator |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Typedef void* ReleaseContext |
| #Line # parameter type for MakeFromRaster ## |
| |
| #Code |
| #Populate |
| ## |
| |
| Caller data passed to RasterReleaseProc; may be nullptr. |
| |
| #SeeAlso MakeFromRaster RasterReleaseProc |
| |
| ## |
| |
| #Typedef void (*RasterReleaseProc)(const void* pixels, ReleaseContext) |
| #Line # parameter type for MakeFromRaster ## |
| |
| #Code |
| #Populate |
| ## |
| |
| Function called when Image no longer shares pixels. ReleaseContext is |
| provided by caller when Image is created, and may be nullptr. |
| |
| #SeeAlso ReleaseContext MakeFromRaster |
| |
| ## |
| |
| #Method static sk_sp<SkImage> MakeFromRaster(const SkPixmap& pixmap, |
| RasterReleaseProc rasterReleaseProc, |
| ReleaseContext releaseContext) |
| #In Constructors |
| #Line # creates Image from Pixmap, with release ## |
| #Populate |
| |
| #Example |
| #Function |
| static void releaseProc(const void* pixels, SkImage::ReleaseContext context) { |
| int* countPtr = static_cast<int*>(context); |
| *countPtr += 1; |
| } |
| ## |
| |
| void draw(SkCanvas* canvas) { |
| SkColor color = 0; |
| SkPixmap pixmap(SkImageInfo::MakeN32(1, 1, kPremul_SkAlphaType), &color, 4); |
| int releaseCount = 0; |
| sk_sp<SkImage> image(SkImage::MakeFromRaster(pixmap, releaseProc, &releaseCount)); |
| SkDebugf("before reset: %d\n", releaseCount); |
| image.reset(); |
| SkDebugf("after reset: %d\n", releaseCount); |
| } |
| #StdOut |
| before reset: 0 |
| after reset: 1 |
| ## |
| ## |
| |
| #SeeAlso MakeRasterCopy MakeRasterData MakeFromGenerator RasterReleaseProc ReleaseContext |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeFromBitmap(const SkBitmap& bitmap) |
| #In Constructors |
| #Line # creates Image from Bitmap, sharing or copying pixels ## |
| #Populate |
| |
| #Example |
| #Description |
| The first Bitmap is shared; writing to the pixel memory changes the first |
| Image. |
| The second Bitmap is marked immutable, and is copied; writing to the pixel |
| memory does not alter the second Image. |
| ## |
| #Height 50 |
| uint8_t storage[][5] = {{ 0xCA, 0xDA, 0xCA, 0xC9, 0xA3 }, |
| { 0xAC, 0xA8, 0x89, 0xA7, 0x87 }, |
| { 0x9B, 0xB5, 0xE5, 0x95, 0x46 }, |
| { 0x90, 0x81, 0xC5, 0x71, 0x33 }, |
| { 0x75, 0x55, 0x44, 0x40, 0x30 }}; |
| SkImageInfo imageInfo = SkImageInfo::Make(5, 5, kGray_8_SkColorType, kOpaque_SkAlphaType); |
| SkPixmap pixmap(imageInfo, storage[0], sizeof(storage) / 5); |
| SkBitmap bitmap; |
| bitmap.installPixels(pixmap); |
| sk_sp<SkImage> image1 = SkImage::MakeFromBitmap(bitmap); |
| bitmap.setImmutable(); |
| sk_sp<SkImage> image2 = SkImage::MakeFromBitmap(bitmap); |
| *pixmap.writable_addr8(2, 2) = 0x00; |
| canvas->scale(10, 10); |
| canvas->drawImage(image1, 0, 0); |
| canvas->drawImage(image2, 10, 0); |
| ## |
| |
| #SeeAlso MakeFromRaster MakeRasterCopy MakeFromGenerator MakeRasterData |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeFromGenerator(std::unique_ptr<SkImageGenerator> imageGenerator, |
| const SkIRect* subset = nullptr) |
| #In Constructors |
| #Line # creates Image from a stream of data ## |
| #Populate |
| |
| #Example |
| #Height 128 |
| #Description |
| The generator returning Picture cannot be shared; std::move transfers ownership to generated Image. |
| ## |
| SkPictureRecorder recorder; |
| recorder.beginRecording(100, 100)->drawColor(SK_ColorRED); |
| auto picture = recorder.finishRecordingAsPicture(); |
| auto gen = SkImageGenerator::MakeFromPicture({100, 100}, picture, nullptr, nullptr, |
| SkImage::BitDepth::kU8, SkColorSpace::MakeSRGB()); |
| sk_sp<SkImage> image = SkImage::MakeFromGenerator(std::move(gen)); |
| canvas->drawImage(image, 0, 0); |
| ## |
| |
| #SeeAlso MakeFromEncoded |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeFromEncoded(sk_sp<SkData> encoded, const SkIRect* subset = nullptr) |
| #In Constructors |
| #Line # creates Image from encoded data ## |
| #Populate |
| |
| #Example |
| #Image 3 |
| int x = 0; |
| for (int quality : { 100, 50, 10, 1} ) { |
| sk_sp<SkData> encodedData = image->encodeToData(SkEncodedImageFormat::kJPEG, quality); |
| sk_sp<SkImage> image = SkImage::MakeFromEncoded(encodedData); |
| canvas->drawImage(image, x, 0); |
| x += 64; |
| } |
| ## |
| |
| #SeeAlso MakeFromGenerator |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Enum CompressionType |
| #Line # option for MakeFromCompressed ## |
| #Code |
| #Populate |
| ## |
| |
| Used to inform MakeFromCompressed which compression method was used on the |
| input data. |
| |
| #Const kETC1_CompressionType 0 |
| #Line # compressed data uses ETC1 compression ## |
| ## |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromCompressed |
| |
| #Enum ## |
| |
| #Method static sk_sp<SkImage> MakeFromCompressed(GrContext* context, sk_sp<SkData> data, int width, int height, CompressionType type) |
| #In Constructors |
| #Line # creates a GPU-backed Image from compressed data ## |
| #Populate |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromTexture CompressionType |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Typedef void (*TextureReleaseProc)(ReleaseContext releaseContext) |
| #Line # parameter type for MakeFromTexture ## |
| |
| #Code |
| #Populate |
| ## |
| |
| User function called when supplied texture may be deleted. |
| #SeeAlso MakeFromTexture |
| ## |
| |
| #Method static sk_sp<SkImage> MakeFromTexture(GrContext* context, |
| const GrBackendTexture& backendTexture, |
| GrSurfaceOrigin origin, |
| SkColorType colorType, |
| SkAlphaType alphaType, |
| sk_sp<SkColorSpace> colorSpace) |
| #In Constructors |
| #Line # creates Image from GPU_Texture ## |
| #Populate |
| |
| #Example |
| #Image 3 |
| #Platform gpu |
| #Height 128 |
| #Description |
| A back-end texture has been created and uploaded to the GPU outside of this example. |
| ## |
| GrContext* context = canvas->getGrContext(); |
| if (!context) { |
| return; |
| } |
| canvas->scale(.25f, .25f); |
| int x = 0; |
| for (auto origin : { kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin } ) { |
| sk_sp<SkImage> image = SkImage::MakeFromTexture(context, backEndTexture, |
| origin, kRGBA_8888_SkColorType, kOpaque_SkAlphaType, nullptr); |
| canvas->drawImage(image, x, 0); |
| x += 512; |
| } |
| ## |
| |
| #SeeAlso MakeFromAdoptedTexture SkSurface::MakeFromBackendTexture |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeFromTexture(GrContext* context, |
| const GrBackendTexture& backendTexture, |
| GrSurfaceOrigin origin, |
| SkColorType colorType, |
| SkAlphaType alphaType, |
| sk_sp<SkColorSpace> colorSpace, |
| TextureReleaseProc textureReleaseProc, |
| ReleaseContext releaseContext) |
| #Populate |
| |
| #Example |
| #Description |
| textureReleaseProc may be called at some later point in time. In this example, |
| textureReleaseProc has no effect on the drawing. |
| ## |
| #Platform gpu |
| #Image 4 |
| GrContext* context = canvas->getGrContext(); |
| if (!context) { |
| return; |
| } |
| auto debugster = [](SkImage::ReleaseContext releaseContext) -> void { |
| *((int *) releaseContext) += 128; |
| }; |
| int x = 0, y = 0; |
| for (auto origin : { kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin } ) { |
| sk_sp<SkImage> image = SkImage::MakeFromTexture(context, backEndTexture, |
| origin, kRGBA_8888_SkColorType, kOpaque_SkAlphaType, nullptr, debugster, &x); |
| canvas->drawImage(image, x, y); |
| y += 128; |
| } |
| ## |
| |
| #SeeAlso MakeFromAdoptedTexture SkSurface::MakeFromBackendTexture |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeCrossContextFromEncoded(GrContext* context, sk_sp<SkData> data, |
| bool buildMips, |
| SkColorSpace* dstColorSpace, |
| bool limitToMaxTextureSize = false) |
| #In Constructors |
| #Line # creates Image from encoded data, and uploads to GPU ## |
| #Populate |
| |
| #Example |
| #Image 4 |
| #Height 64 |
| GrContext* context = canvas->getGrContext(); |
| sk_sp<SkData> encodedData = image->encodeToData(SkEncodedImageFormat::kJPEG, 100); |
| sk_sp<SkImage> image = SkImage::MakeCrossContextFromEncoded(context, |
| encodedData, false, nullptr); |
| canvas->drawImage(image, 0, 0); |
| ## |
| |
| #SeeAlso MakeCrossContextFromPixmap |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeCrossContextFromPixmap(GrContext* context, const SkPixmap& pixmap, |
| bool buildMips, |
| SkColorSpace* dstColorSpace, |
| bool limitToMaxTextureSize = false) |
| #In Constructors |
| #Line # creates Image from Pixmap, and uploads to GPU ## |
| #Populate |
| |
| #Example |
| #Image 4 |
| #Height 64 |
| GrContext* context = canvas->getGrContext(); |
| SkPixmap pixmap; |
| if (source.peekPixels(&pixmap)) { |
| sk_sp<SkImage> image = SkImage::MakeCrossContextFromPixmap(context, pixmap, |
| false, nullptr); |
| canvas->drawImage(image, 0, 0); |
| } |
| ## |
| |
| #SeeAlso MakeCrossContextFromEncoded |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeFromAdoptedTexture(GrContext* context, |
| const GrBackendTexture& backendTexture, |
| GrSurfaceOrigin surfaceOrigin, |
| SkColorType colorType, |
| SkAlphaType alphaType = kPremul_SkAlphaType, |
| sk_sp<SkColorSpace> colorSpace = nullptr) |
| #In Constructors |
| #Line # creates Image from GPU_Texture, managed internally ## |
| #Populate |
| |
| #Example |
| #Image 5 |
| #Platform gpu |
| if (!canvas->getGrContext()) { |
| return; |
| } |
| canvas->scale(.5f, .5f); |
| canvas->clear(0x7f3f5f7f); |
| int x = 0, y = 0; |
| for (auto origin : { kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin } ) { |
| for (auto alpha : { kOpaque_SkAlphaType, kPremul_SkAlphaType, kUnpremul_SkAlphaType } ) { |
| sk_sp<SkImage> image = SkImage::MakeFromAdoptedTexture(canvas->getGrContext(), |
| backEndTexture, origin, |
| kRGBA_8888_SkColorType, alpha); |
| canvas->drawImage(image, x, y); |
| x += 160; |
| } |
| x -= 160 * 3; |
| y += 256; |
| } |
| ## |
| |
| #SeeAlso MakeFromTexture MakeFromYUVTexturesCopy |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeFromYUVATexturesCopy(GrContext* context, |
| SkYUVColorSpace yuvColorSpace, |
| const GrBackendTexture yuvaTextures[], |
| const SkYUVAIndex yuvaIndices[4], |
| SkISize imageSize, |
| GrSurfaceOrigin imageOrigin, |
| sk_sp<SkColorSpace> imageColorSpace = nullptr) |
| #In Constructor |
| #Line # creates Image from YUV_ColorSpace data ## |
| #Populate |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromYUVATexturesCopyWithExternalBackend MakeFromYUVATextures |
| |
| #Method ## |
| |
| #Method static sk_sp<SkImage> MakeFromYUVATextures(GrContext* context, |
| SkYUVColorSpace yuvColorSpace, |
| const GrBackendTexture yuvaTextures[], |
| const SkYUVAIndex yuvaIndices[4], |
| SkISize imageSize, |
| GrSurfaceOrigin imageOrigin, |
| sk_sp<SkColorSpace> imageColorSpace = nullptr); |
| |
| #In Constructor |
| #Line # creates Image from YUV_ColorSpace data ## |
| #Populate |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromYUVATexturesCopy MakeFromYUVATexturesCopyWithExternalBackend |
| |
| #Method ## |
| |
| #Method static sk_sp<SkImage> MakeFromYUVAPixmaps( |
| GrContext* context, |
| SkYUVColorSpace yuvColorSpace, |
| const SkPixmap yuvaPixmaps[], |
| const SkYUVAIndex yuvaIndices[4], |
| SkISize imageSize, |
| GrSurfaceOrigin imageOrigin, |
| bool buildMips, |
| bool limitToMaxTextureSize = false, |
| sk_sp<SkColorSpace> imageColorSpace = nullptr); |
| |
| #In Constructor |
| #Line # creates Image from YUV_ColorSpace data ## |
| #Populate |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromYUVATextures |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeFromYUVATexturesCopyWithExternalBackend( |
| GrContext* context, |
| SkYUVColorSpace yuvColorSpace, |
| const GrBackendTexture yuvaTextures[], |
| const SkYUVAIndex yuvaIndices[4], |
| SkISize imageSize, |
| GrSurfaceOrigin imageOrigin, |
| const GrBackendTexture& backendTexture, |
| sk_sp<SkColorSpace> imageColorSpace = nullptr) |
| #In Constructor |
| #Line # creates Image from planar YUV_ColorSpace, stored in texture ## |
| #Populate |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromYUVATexturesCopy MakeFromYUVATextures |
| |
| #Method ## |
| |
| #Method static sk_sp<SkImage> MakeFromYUVTexturesCopy(GrContext* context, SkYUVColorSpace yuvColorSpace, |
| const GrBackendTexture yuvTextures[3], |
| GrSurfaceOrigin imageOrigin, |
| sk_sp<SkColorSpace> imageColorSpace = nullptr) |
| #In Constructors |
| #Line # creates Image from YUV_ColorSpace data in three planes ## |
| #Populate |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromYUVTexturesCopyWithExternalBackend MakeFromNV12TexturesCopy MakeFromYUVATexturesCopy |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeFromYUVTexturesCopyWithExternalBackend( |
| GrContext* context, SkYUVColorSpace yuvColorSpace, |
| const GrBackendTexture yuvTextures[3], GrSurfaceOrigin imageOrigin, |
| const GrBackendTexture& backendTexture, sk_sp<SkColorSpace> imageColorSpace = nullptr); |
| #In Constructors |
| #Line # creates Image from planar YUV_ColorSpace, stored in texture ## |
| #Populate |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromYUVTexturesCopy MakeFromNV12TexturesCopy MakeFromYUVATexturesCopyWithExternalBackend |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeFromNV12TexturesCopy(GrContext* context, |
| SkYUVColorSpace yuvColorSpace, |
| const GrBackendTexture nv12Textures[2], |
| GrSurfaceOrigin imageOrigin, |
| sk_sp<SkColorSpace> imageColorSpace = nullptr) |
| #In Constructors |
| #Line # creates Image from YUV_ColorSpace data in three planes ## |
| #Populate |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromNV12TexturesCopyWithExternalBackend MakeFromYUVTexturesCopy MakeFromYUVATexturesCopy |
| |
| #Method ## |
| |
| #Method static sk_sp<SkImage> MakeFromNV12TexturesCopyWithExternalBackend( |
| GrContext* context, |
| SkYUVColorSpace yuvColorSpace, |
| const GrBackendTexture nv12Textures[2], |
| GrSurfaceOrigin imageOrigin, |
| const GrBackendTexture& backendTexture, |
| sk_sp<SkColorSpace> imageColorSpace = nullptr); |
| #In Constructors |
| #Line # creates Image from planar YUV_ColorSpace, stored in texture ## |
| #Populate |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromNV12TexturesCopy MakeFromYUVTexturesCopy MakeFromYUVATexturesCopyWithExternalBackend |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| # currently uncalled by any test or client ## |
| #Bug 7424 |
| |
| #EnumClass BitDepth |
| #Line # options for MakeFromPicture ## |
| #Code |
| #Populate |
| ## |
| |
| #Const kU8 0 |
| #Line # uses 8-bit unsigned int per Color component ## |
| Use 8 bits per ARGB component using unsigned integer format. |
| ## |
| #Const kF16 1 |
| #Line # uses 16-bit float per Color component ## |
| Use 16 bits per ARGB component using half-precision floating point format. |
| ## |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromPicture |
| |
| #EnumClass ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeFromPicture(sk_sp<SkPicture> picture, const SkISize& dimensions, |
| const SkMatrix* matrix, const SkPaint* paint, |
| BitDepth bitDepth, |
| sk_sp<SkColorSpace> colorSpace) |
| #In Constructors |
| #Line # creates Image from Picture ## |
| #Populate |
| |
| #Example |
| SkPaint paint; |
| SkPictureRecorder recorder; |
| SkCanvas* recordingCanvas = recorder.beginRecording(50, 50); |
| for (auto color : { SK_ColorRED, SK_ColorBLUE, 0xff007f00 } ) { |
| paint.setColor(color); |
| recordingCanvas->drawRect({10, 10, 30, 40}, paint); |
| recordingCanvas->translate(10, 10); |
| recordingCanvas->scale(1.2f, 1.4f); |
| } |
| sk_sp<SkPicture> playback = recorder.finishRecordingAsPicture(); |
| int x = 0, y = 0; |
| for (auto alpha : { 70, 140, 210 } ) { |
| paint.setAlpha(alpha); |
| auto srgbColorSpace = SkColorSpace::MakeSRGB(); |
| sk_sp<SkImage> image = SkImage::MakeFromPicture(playback, {50, 50}, nullptr, &paint, |
| SkImage::BitDepth::kU8, srgbColorSpace); |
| canvas->drawImage(image, x, y); |
| x += 70; y += 70; |
| } |
| ## |
| |
| #SeeAlso SkCanvas::drawPicture |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static sk_sp<SkImage> MakeFromAHardwareBuffer( |
| AHardwareBuffer* hardwareBuffer, |
| SkAlphaType alphaType = kPremul_SkAlphaType, |
| sk_sp<SkColorSpace> colorSpace = nullptr, |
| GrSurfaceOrigin surfaceOrigin = kTopLeft_GrSurfaceOrigin) |
| #In Constructors |
| #Line # creates Image from Android hardware buffer ## |
| #Populate |
| |
| #NoExample |
| ## |
| |
| #SeeAlso MakeFromRaster |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| #Subtopic Property |
| #Line # values and attributes ## |
| ## |
| |
| #Method int width() const |
| #In Property |
| #Line # returns pixel column count ## |
| #Populate |
| |
| #Example |
| #Image 4 |
| #Height 96 |
| canvas->translate(10, 10); |
| canvas->drawImage(image, 0, 0); |
| canvas->translate(0, image->height()); |
| SkPaint paint; |
| canvas->drawLine(0, 10, image->width(), 10, paint); |
| canvas->drawString("width", image->width() / 2 - 15, 25, paint); |
| ## |
| |
| #SeeAlso dimensions() height() |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method int height() const |
| #In Property |
| #Line # returns pixel row count ## |
| #Populate |
| |
| #Example |
| #Image 4 |
| #Height 96 |
| canvas->translate(10, 10); |
| canvas->drawImage(image, 0, 0); |
| canvas->translate(image->width(), 0); |
| SkPaint paint; |
| canvas->drawLine(10, 0, 10, image->height(), paint); |
| canvas->drawString("height", 34, image->height() / 2, paint); |
| ## |
| |
| #SeeAlso dimensions() width() |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method SkISize dimensions() const |
| #In Property |
| #Line # returns width() and height() ## |
| #Populate |
| |
| #Example |
| #Image 4 |
| SkISize dimensions = image->dimensions(); |
| SkIRect bounds = image->bounds(); |
| SkIRect dimensionsAsBounds = SkIRect::MakeSize(dimensions); |
| SkDebugf("dimensionsAsBounds %c= bounds\n", dimensionsAsBounds == bounds ? '=' : '!'); |
| #StdOut |
| dimensionsAsBounds == bounds |
| ## |
| ## |
| |
| #SeeAlso height() width() bounds() |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method SkIRect bounds() const |
| #In Property |
| #Line # returns width() and height() as Rectangle ## |
| #Populate |
| |
| #Example |
| #Height 128 |
| #Image 4 |
| SkIRect bounds = image->bounds(); |
| for (int x : { 0, bounds.width() } ) { |
| for (int y : { 0, bounds.height() } ) { |
| canvas->drawImage(image, x, y); |
| } |
| } |
| ## |
| |
| #SeeAlso dimensions() |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method uint32_t uniqueID() const |
| #In Property |
| #Line # returns identifier for Image ## |
| #Populate |
| |
| #Example |
| #Image 5 |
| #Height 156 |
| sk_sp<SkImage> subset = image->makeSubset({10, 20, 90, 100}); |
| canvas->drawImage(image, 0, 0); |
| canvas->drawImage(subset, 128, 0); |
| SkPaint paint; |
| SkString s; |
| s.printf("original id: %d", image->uniqueID()); |
| canvas->drawString(s, 20, image->height() + 20, paint); |
| s.printf("subset id: %d", subset->uniqueID()); |
| canvas->drawString(s, 148, subset->height() + 20, paint); |
| ## |
| |
| #SeeAlso isLazyGenerated |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method SkAlphaType alphaType() const |
| #In Property |
| #Line # returns Alpha_Type ## |
| Returns Alpha_Type, one of: #list_of_alpha_types#. |
| |
| Alpha_Type returned was a parameter to an Image constructor, |
| or was parsed from encoded data. |
| |
| #Return Alpha_Type in Image ## |
| |
| #Example |
| #Image 4 |
| #Height 96 |
| const char* alphaTypeStr[] = { "Unknown", "Opaque", "Premul", "Unpremul" }; |
| SkAlphaType alphaType = image->alphaType(); |
| canvas->drawImage(image, 16, 0); |
| canvas->drawString(alphaTypeStr[(int) alphaType], 20, image->height() + 20, SkPaint()); |
| ## |
| |
| #SeeAlso SkImageInfo::alphaType |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method SkColorType colorType() const |
| #In Property |
| #Line # returns Color_Type ## |
| #Populate |
| |
| #Example |
| #Image 4 |
| #Height 96 |
| const char* colors[] = { "Unknown", "Alpha_8", "RGB_565", "ARGB_4444", "RGBA_8888", "RGB_888x", |
| "BGRA_8888", "RGBA_1010102", "RGB_101010x", "Gray_8", "RGBA_F16" }; |
| SkColorType colorType = image->colorType(); |
| canvas->drawImage(image, 16, 0); |
| canvas->drawString(colors[(int) colorType], 20, image->height() + 20, SkPaint()); |
| ## |
| |
| #SeeAlso SkImageInfo::colorType |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method SkColorSpace* colorSpace() const |
| #In Property |
| #Line # returns Color_Space ## |
| #Populate |
| |
| #Example |
| #Image 3 |
| #Set sRGB |
| SkPixmap pixmap; |
| source.peekPixels(&pixmap); |
| canvas->scale(.25f, .25f); |
| int y = 0; |
| for (auto gamma : { SkNamedTransferFn::kLinear, |
| SkNamedTransferFn::kSRGB } ) { |
| int x = 0; |
| sk_sp<SkColorSpace> colorSpace = SkColorSpace::MakeRGB(gamma, SkNamedGamut::kSRGB); |
| for (int index = 0; index < 2; ++index) { |
| pixmap.setColorSpace(colorSpace); |
| sk_sp<SkImage> image = SkImage::MakeRasterCopy(pixmap); |
| canvas->drawImage(image, x, y); |
| colorSpace = image->colorSpace()->makeColorSpin(); |
| x += 512; |
| } |
| y += 512; |
| } |
| ## |
| |
| #SeeAlso refColorSpace makeColorSpace |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkColorSpace> refColorSpace() const |
| #In Property |
| #Line # returns Image_Info Color_Space ## |
| #Populate |
| |
| #Example |
| #Image 3 |
| #Set sRGB |
| SkPixmap pixmap; |
| source.peekPixels(&pixmap); |
| canvas->scale(.25f, .25f); |
| int y = 0; |
| for (auto gamma : { SkNamedTransferFn::kLinear, |
| SkNamedTransferFn::kSRGB } ) { |
| int x = 0; |
| sk_sp<SkColorSpace> colorSpace = SkColorSpace::MakeRGB(gamma, SkNamedGamut::kSRGB); |
| for (int index = 0; index < 2; ++index) { |
| pixmap.setColorSpace(colorSpace); |
| sk_sp<SkImage> image = SkImage::MakeRasterCopy(pixmap); |
| canvas->drawImage(image, x, y); |
| colorSpace = image->refColorSpace()->makeColorSpin(); |
| x += 512; |
| } |
| y += 512; |
| } |
| ## |
| |
| #SeeAlso colorSpace makeColorSpace |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method bool isAlphaOnly() const |
| #In Property |
| #Line # returns if pixels represent a transparency mask ## |
| #Populate |
| |
| #Example |
| uint8_t pmColors = 0; |
| sk_sp<SkImage> image = SkImage::MakeRasterCopy({SkImageInfo::MakeA8(1, 1), &pmColors, 1}); |
| SkDebugf("alphaOnly = %s\n", image->isAlphaOnly() ? "true" : "false"); |
| #StdOut |
| alphaOnly = true |
| ## |
| ## |
| |
| #SeeAlso alphaType isOpaque |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method bool isOpaque() const |
| #In Property |
| #Line # returns if Alpha_Type is kOpaque_SkAlphaType ## |
| #Populate |
| |
| #Example |
| auto check_isopaque = [](const SkImageInfo& imageInfo) -> void { |
| auto surface(SkSurface::MakeRaster(imageInfo)); |
| auto image(surface->makeImageSnapshot()); |
| SkDebugf("isOpaque = %s\n", image->isOpaque() ? "true" : "false"); |
| }; |
| |
| check_isopaque(SkImageInfo::MakeN32Premul(5, 5)); |
| check_isopaque(SkImageInfo::MakeN32(5, 5, kOpaque_SkAlphaType)); |
| #StdOut |
| isOpaque = false |
| isOpaque = true |
| ## |
| ## |
| |
| #SeeAlso alphaType isAlphaOnly |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkShader> makeShader(SkShader::TileMode tileMode1, SkShader::TileMode tileMode2, |
| const SkMatrix* localMatrix = nullptr) const |
| #In Constructors |
| #Line # creates Shader, Paint element that can tile Image ## |
| #Populate |
| |
| #Example |
| #Image 4 |
| SkMatrix matrix; |
| matrix.setRotate(45); |
| SkPaint paint; |
| paint.setShader(image->makeShader(SkShader::kRepeat_TileMode, SkShader::kMirror_TileMode, |
| &matrix)); |
| canvas->drawPaint(paint); |
| ## |
| |
| #SeeAlso scalePixels |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkShader> makeShader(const SkMatrix* localMatrix = nullptr) const |
| #Populate |
| |
| #Example |
| #Image 5 |
| SkMatrix matrix; |
| matrix.setRotate(45); |
| matrix.postTranslate(125, 30); |
| SkPaint paint; |
| paint.setShader(image->makeShader(&matrix)); |
| canvas->drawPaint(paint); |
| ## |
| |
| #SeeAlso scalePixels |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| #Subtopic Pixels |
| #Line # read and write pixel values ## |
| ## |
| |
| #Method bool peekPixels(SkPixmap* pixmap) const |
| #In Pixels |
| #Line # returns Pixmap if possible ## |
| #Populate |
| |
| #Example |
| SkBitmap bitmap; |
| bitmap.allocPixels(SkImageInfo::MakeN32Premul(12, 11)); |
| SkCanvas offscreen(bitmap); |
| offscreen.clear(SK_ColorWHITE); |
| SkPaint paint; |
| offscreen.drawString("%", 1, 10, paint); |
| sk_sp<SkImage> image = SkImage::MakeFromBitmap(bitmap); |
| SkPixmap pixmap; |
| if (image->peekPixels(&pixmap)) { |
| const SkPMColor* pixels = pixmap.addr32(); |
| SkPMColor pmWhite = pixels[0]; |
| for (int y = 0; y < image->height(); ++y) { |
| for (int x = 0; x < image->width(); ++x) { |
| SkDebugf("%c", *pixels++ == pmWhite ? '-' : 'x'); |
| } |
| SkDebugf("\n"); |
| } |
| } |
| #StdOut |
| ------------ |
| --xx----x--- |
| -x--x--x---- |
| -x--x--x---- |
| -x--x-x----- |
| --xx-xx-xx-- |
| -----x-x--x- |
| ----x--x--x- |
| ----x--x--x- |
| ---x----xx-- |
| ------------ |
| ## |
| ## |
| |
| #SeeAlso readPixels |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method bool isTextureBacked() const |
| #In Property |
| #Line # returns if Image was created from GPU_Texture ## |
| #Populate |
| |
| #Example |
| #Image 5 |
| #Platform gpu |
| auto drawImage = [=](sk_sp<SkImage> image, const char* label) -> void { |
| if (nullptr == image) { |
| return; |
| } |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| canvas->drawImage(image, 0, 0); |
| canvas->drawString(label, 30, image->height() / 4, paint); |
| canvas->drawString(image->isTextureBacked() ? "is GPU texture" : "not GPU texture", |
| 20, image->height() * 3 / 4, paint); |
| }; |
| sk_sp<SkImage> bitmapImage(SkImage::MakeFromBitmap(source)); |
| sk_sp<SkImage> textureImage(SkImage::MakeFromTexture(canvas->getGrContext(), backEndTexture, |
| kTopLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType, |
| kOpaque_SkAlphaType, nullptr)); |
| drawImage(image, "image"); |
| canvas->translate(image->width(), 0); |
| drawImage(bitmapImage, "source"); |
| canvas->translate(-image->width(), image->height()); |
| drawImage(textureImage, "backEndTexture"); |
| ## |
| |
| #SeeAlso MakeFromTexture isValid |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method bool isValid(GrContext* context) const |
| #In Property |
| #Line # returns if Image can draw to Raster_Surface or GPU_Context ## |
| #Populate |
| |
| #Example |
| #Image 5 |
| #Platform gpu |
| auto drawImage = [=](sk_sp<SkImage> image, const char* label) -> void { |
| if (nullptr == image) { |
| return; |
| } |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| canvas->drawImage(image, 0, 0); |
| canvas->drawString(label, image->width() / 2, image->height() / 4, paint); |
| if (canvas->getGrContext()) { |
| canvas->drawString(image->isValid(canvas->getGrContext()) ? "is valid on GPU" : |
| "not valid on GPU", 20, image->height() * 5 / 8, paint); |
| } |
| canvas->drawString(image->isValid(nullptr) ? "is valid on CPU" : |
| "not valid on CPU", 20, image->height() * 7 / 8, paint); |
| }; |
| sk_sp<SkImage> bitmapImage(SkImage::MakeFromBitmap(source)); |
| sk_sp<SkImage> textureImage(SkImage::MakeFromTexture(canvas->getGrContext(), backEndTexture, |
| kTopLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType, |
| kOpaque_SkAlphaType, nullptr)); |
| drawImage(image, "image"); |
| canvas->translate(image->width(), 0); |
| drawImage(bitmapImage, "source"); |
| canvas->translate(-image->width(), image->height()); |
| drawImage(textureImage, "backEndTexture"); |
| ## |
| |
| #SeeAlso isTextureBacked isLazyGenerated |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method GrBackendTexture getBackendTexture(bool flushPendingGrContextIO, |
| GrSurfaceOrigin* origin = nullptr) const |
| #In Property |
| #Line # returns GPU reference to Image as texture ## |
| #Populate |
| |
| #Example |
| #Image 3 |
| #Platform gpu |
| GrContext* grContext = canvas->getGrContext(); |
| if (!grContext) { |
| canvas->drawString("GPU only!", 20, 40, SkPaint()); |
| return; |
| } |
| sk_sp<SkImage> imageFromBackend = SkImage::MakeFromAdoptedTexture(grContext, backEndTexture, |
| kBottomLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType, kOpaque_SkAlphaType); |
| GrBackendTexture textureFromImage = imageFromBackend->getBackendTexture(false); |
| if (!textureFromImage.isValid()) { |
| return; |
| } |
| sk_sp<SkImage> imageFromTexture = SkImage::MakeFromAdoptedTexture(grContext, textureFromImage, |
| kTopLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType, kOpaque_SkAlphaType); |
| canvas->drawImage(imageFromTexture, 0, 0); |
| canvas->drawImage(imageFromBackend, 128, 128); |
| ## |
| |
| #SeeAlso MakeFromTexture isTextureBacked |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Enum CachingHint |
| #Line # options for readPixels and scalePixels ## |
| #Code |
| #Populate |
| ## |
| |
| CachingHint selects whether Skia may internally cache Bitmaps generated by |
| decoding Image, or by copying Image from GPU to CPU. The default behavior |
| allows caching Bitmaps. |
| |
| Choose kDisallow_CachingHint if Image pixels are to be used only once, or |
| if Image pixels reside in a cache outside of Skia, or to reduce memory pressure. |
| |
| Choosing kAllow_CachingHint does not ensure that pixels will be cached. |
| Image pixels may not be cached if memory requirements are too large or |
| pixels are not accessible. |
| |
| #Const kAllow_CachingHint 0 |
| #Line # allows internally caching decoded and copied pixels ## |
| ## |
| #Const kDisallow_CachingHint 1 |
| #Line # disallows internally caching decoded and copied pixels ## |
| ## |
| |
| #NoExample |
| ## |
| |
| #SeeAlso readPixels scalePixels |
| |
| #Enum ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes, |
| int srcX, int srcY, CachingHint cachingHint = kAllow_CachingHint) const |
| #In Pixels |
| #Line # copies and converts pixels ## |
| |
| Copies Rect of pixels from Image to dstPixels. Copy starts at offset (srcX, srcY), |
| and does not exceed Image (width(), height()). |
| |
| dstInfo specifies width, height, Color_Type, Alpha_Type, and Color_Space of |
| destination. dstRowBytes specifics the gap from one destination row to the next. |
| Returns true if pixels are copied. Returns false if: |
| #List |
| # dstInfo has no address ## |
| # dstRowBytes is less than dstInfo.minRowBytes() ## |
| # Pixel_Ref is nullptr ## |
| ## |
| |
| Pixels are copied only if pixel conversion is possible. If Image Color_Type is |
| kGray_8_SkColorType, or kAlpha_8_SkColorType; dstInfo.colorType() must match. |
| If Image Color_Type is kGray_8_SkColorType, dstInfo.colorSpace() must match. |
| If Image Alpha_Type is kOpaque_SkAlphaType, dstInfo.alphaType() must |
| match. If Image Color_Space is nullptr, dstInfo.colorSpace() must match. Returns |
| false if pixel conversion is not possible. |
| |
| srcX and srcY may be negative to copy only top or left of source. Returns |
| false if width() or height() is zero or negative. |
| Returns false if #Formula # abs(srcX) >= Image width() ##, or if #Formula # abs(srcY) >= Image height() ##. |
| |
| If cachingHint is kAllow_CachingHint, pixels may be retained locally. |
| If cachingHint is kDisallow_CachingHint, pixels are not added to the local cache. |
| |
| #Param dstInfo destination width, height, Color_Type, Alpha_Type, Color_Space ## |
| #Param dstPixels destination pixel storage ## |
| #Param dstRowBytes destination row length ## |
| #Param srcX column index whose absolute value is less than width() ## |
| #Param srcY row index whose absolute value is less than height() ## |
| #Param cachingHint one of: kAllow_CachingHint, kDisallow_CachingHint ## |
| |
| #Return true if pixels are copied to dstPixels ## |
| |
| #Example |
| #Image 3 |
| canvas->scale(.5f, .5f); |
| const int width = 32; |
| const int height = 32; |
| std::vector<int32_t> dstPixels; |
| dstPixels.resize(height * width * 4); |
| SkImageInfo info = SkImageInfo::MakeN32Premul(width, height); |
| for (int y = 0; y < 512; y += height ) { |
| for (int x = 0; x < 512; x += width ) { |
| if (image->readPixels(info, &dstPixels.front(), width * 4, x, y)) { |
| SkPixmap dstPixmap(info, &dstPixels.front(), width * 4); |
| SkBitmap bitmap; |
| bitmap.installPixels(dstPixmap); |
| canvas->drawBitmap(bitmap, 0, 0); |
| } |
| canvas->translate(48, 0); |
| } |
| canvas->translate(-16 * 48, 48); |
| } |
| ## |
| |
| #SeeAlso scalePixels SkBitmap::readPixels SkPixmap::readPixels SkCanvas::readPixels SkSurface::readPixels |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method bool readPixels(const SkPixmap& dst, int srcX, int srcY, |
| CachingHint cachingHint = kAllow_CachingHint) const |
| |
| Copies a Rect of pixels from Image to dst. Copy starts at (srcX, srcY), and |
| does not exceed Image (width(), height()). |
| |
| dst specifies width, height, Color_Type, Alpha_Type, Color_Space, pixel storage, |
| and row bytes of destination. dst.rowBytes() specifics the gap from one destination |
| row to the next. Returns true if pixels are copied. Returns false if: |
| #List |
| # dst pixel storage equals nullptr ## |
| # dst.rowBytes() is less than SkImageInfo::minRowBytes ## |
| # Pixel_Ref is nullptr ## |
| ## |
| |
| Pixels are copied only if pixel conversion is possible. If Image Color_Type is |
| kGray_8_SkColorType, or kAlpha_8_SkColorType; dst.colorType() must match. |
| If Image Color_Type is kGray_8_SkColorType, dst.colorSpace() must match. |
| If Image Alpha_Type is kOpaque_SkAlphaType, dst.alphaType() must |
| match. If Image Color_Space is nullptr, dst.colorSpace() must match. Returns |
| false if pixel conversion is not possible. |
| |
| srcX and srcY may be negative to copy only top or left of source. Returns |
| false if width() or height() is zero or negative. |
| Returns false if #Formula # abs(srcX) >= Image width() ##, or if #Formula # abs(srcY) >= Image height() ##. |
| |
| If cachingHint is kAllow_CachingHint, pixels may be retained locally. |
| If cachingHint is kDisallow_CachingHint, pixels are not added to the local cache. |
| |
| #Param dst destination Pixmap: Image_Info, pixels, row bytes ## |
| #Param srcX column index whose absolute value is less than width() ## |
| #Param srcY row index whose absolute value is less than height() ## |
| #Param cachingHint one of: kAllow_CachingHint, kDisallow_CachingHint ## |
| |
| #Return true if pixels are copied to dst ## |
| |
| #Example |
| #Image 3 |
| std::vector<int32_t> srcPixels; |
| int rowBytes = image->width() * 4; |
| int quarterWidth = image->width() / 4; |
| int quarterHeight = image->height() / 4; |
| srcPixels.resize(image->height() * rowBytes); |
| for (int y = 0; y < 4; ++y) { |
| for (int x = 0; x < 4; ++x) { |
| SkPixmap pixmap(SkImageInfo::MakeN32Premul(quarterWidth, quarterHeight), |
| &srcPixels.front() + x * image->height() * quarterWidth + |
| y * quarterWidth, rowBytes); |
| image->readPixels(pixmap, x * quarterWidth, y * quarterHeight); |
| } |
| } |
| canvas->scale(.5f, .5f); |
| SkBitmap bitmap; |
| bitmap.installPixels(SkImageInfo::MakeN32Premul(image->width(), image->height()), |
| &srcPixels.front(), rowBytes); |
| canvas->drawBitmap(bitmap, 0, 0); |
| ## |
| |
| #SeeAlso scalePixels SkBitmap::readPixels SkPixmap::readPixels SkCanvas::readPixels SkSurface::readPixels |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method bool scalePixels(const SkPixmap& dst, SkFilterQuality filterQuality, |
| CachingHint cachingHint = kAllow_CachingHint) const |
| #In Pixels |
| #Line # scales and converts one Image to another ## |
| #Populate |
| |
| #Example |
| #Image 3 |
| #Height 128 |
| std::vector<int32_t> srcPixels; |
| int quarterWidth = image->width() / 16; |
| int rowBytes = quarterWidth * 4; |
| int quarterHeight = image->height() / 16; |
| srcPixels.resize(quarterHeight * rowBytes); |
| SkPixmap pixmap(SkImageInfo::MakeN32Premul(quarterWidth, quarterHeight), |
| &srcPixels.front(), rowBytes); |
| canvas->scale(4, 4); |
| SkFilterQuality qualities[] = { kNone_SkFilterQuality, kLow_SkFilterQuality, |
| kMedium_SkFilterQuality, kHigh_SkFilterQuality }; |
| for (unsigned index = 0; index < SK_ARRAY_COUNT(qualities); ++index) { |
| image->scalePixels(pixmap, qualities[index]); |
| sk_sp<SkImage> filtered = SkImage::MakeFromRaster(pixmap, nullptr, nullptr); |
| canvas->drawImage(filtered, 16 * index, 0); |
| } |
| ## |
| |
| #SeeAlso SkCanvas::drawImage readPixels SkPixmap::scalePixels |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkData> encodeToData(SkEncodedImageFormat encodedImageFormat, int quality) const |
| #In Utility |
| #Line # returns encoded Image as SkData ## |
| #Populate |
| |
| #Example |
| #Image 3 |
| canvas->scale(4, 4); |
| SkIRect subset = {0, 0, 16, 64}; |
| int x = 0; |
| for (int quality : { 0, 10, 50, 100 } ) { |
| sk_sp<SkData> data(image->encodeToData(SkEncodedImageFormat::kJPEG, quality)); |
| sk_sp<SkImage> filtered = SkImage::MakeFromEncoded(data, &subset); |
| canvas->drawImage(filtered, x, 0); |
| x += 16; |
| } |
| ## |
| |
| #SeeAlso refEncodedData MakeFromEncoded |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkData> encodeToData() const |
| #Populate |
| |
| #Example |
| #Image 3 |
| canvas->scale(4, 4); |
| SkIRect subset = {136, 32, 200, 96}; |
| sk_sp<SkData> data(image->encodeToData()); |
| sk_sp<SkImage> eye = SkImage::MakeFromEncoded(data, &subset); |
| canvas->drawImage(eye, 0, 0); |
| ## |
| |
| #SeeAlso refEncodedData MakeFromEncoded |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkData> refEncodedData() const |
| #In Utility |
| #Line # returns Image encoded in SkData if present ## |
| #Populate |
| |
| #Example |
| #Image 3 |
| #Platform gpu |
| struct { |
| const char* name; |
| sk_sp<SkImage> image; |
| } tests[] = { { "image", image }, { "bitmap", SkImage::MakeFromBitmap(source) }, |
| { "texture", SkImage::MakeFromTexture(canvas->getGrContext(), backEndTexture, |
| kTopLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType, |
| kOpaque_SkAlphaType, nullptr) } }; |
| SkString string; |
| SkPaint paint; |
| for (const auto& test : tests ) { |
| if (!test.image) { |
| string.printf("no %s", test.name); |
| } else { |
| string.printf("%s" "encoded %s", test.image->refEncodedData() ? "" : "no ", test.name); |
| } |
| canvas->drawString(string, 10, 20, paint); |
| canvas->translate(0, 20); |
| } |
| ## |
| |
| #SeeAlso encodeToData MakeFromEncoded |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| #Subtopic Utility |
| #Line # rarely called management functions ## |
| ## |
| |
| #Method sk_sp<SkImage> makeSubset(const SkIRect& subset) const |
| #In Constructors |
| #Line # creates Image containing part of original ## |
| #Populate |
| |
| #Example |
| #Image 3 |
| canvas->scale(.5f, .5f); |
| const int width = 64; |
| const int height = 64; |
| for (int y = 0; y < 512; y += height ) { |
| for (int x = 0; x < 512; x += width ) { |
| sk_sp<SkImage> subset(image->makeSubset({x, y, x + width, y + height})); |
| canvas->drawImage(subset, x * 3 / 2, y * 3 / 2); |
| } |
| } |
| ## |
| |
| #SeeAlso MakeFromEncoded |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkImage> makeTextureImage(GrContext* context, SkColorSpace* dstColorSpace, |
| GrMipMapped mipMapped = GrMipMapped::kNo) const |
| #In Constructors |
| #Line # creates Image matching Color_Space if possible ## |
| #Populate |
| |
| #Example |
| #Platform gpu |
| #Image 5 |
| auto drawImage = [=](sk_sp<SkImage> image, GrContext* context, const char* label) -> void { |
| if (nullptr == image || nullptr == context) { |
| return; |
| } |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| sk_sp<SkImage> texture(image->makeTextureImage(context, nullptr)); |
| canvas->drawImage(texture, 0, 0); |
| canvas->drawString(label, 20, texture->height() / 4, paint); |
| }; |
| sk_sp<SkImage> bitmapImage(SkImage::MakeFromBitmap(source)); |
| GrContext* context = canvas->getGrContext(); |
| sk_sp<SkImage> textureImage(SkImage::MakeFromTexture(context, backEndTexture, |
| kTopLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType, |
| kOpaque_SkAlphaType, nullptr)); |
| drawImage(image, context, "image"); |
| canvas->translate(image->width(), 0); |
| drawImage(bitmapImage, context, "source"); |
| canvas->translate(-image->width(), image->height()); |
| drawImage(textureImage, context, "backEndTexture"); |
| ## |
| |
| #SeeAlso MakeFromTexture |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkImage> makeNonTextureImage() const |
| #In Constructors |
| #Line # creates Image without dependency on GPU_Texture ## |
| #Populate |
| |
| #Example |
| #Image 5 |
| #Platform gpu |
| auto drawImage = [=](sk_sp<SkImage> image, const char* label) -> void { |
| if (nullptr == image) { |
| return; |
| } |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| sk_sp<SkImage> nonTexture(image->makeNonTextureImage()); |
| canvas->drawImage(nonTexture, 0, 0); |
| canvas->drawString(label, 20, nonTexture->height() / 4, paint); |
| }; |
| sk_sp<SkImage> bitmapImage(SkImage::MakeFromBitmap(source)); |
| sk_sp<SkImage> textureImage(SkImage::MakeFromTexture(canvas->getGrContext(), backEndTexture, |
| kTopLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType, |
| kOpaque_SkAlphaType, nullptr)); |
| drawImage(image, "image"); |
| canvas->translate(image->width(), 0); |
| drawImage(bitmapImage, "source"); |
| canvas->translate(-image->width(), image->height()); |
| drawImage(textureImage, "backEndTexture"); |
| ## |
| |
| #SeeAlso makeTextureImage makeRasterImage MakeBackendTextureFromSkImage |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkImage> makeRasterImage() const |
| #In Constructors |
| #Line # creates Image compatible with Raster_Surface if possible ## |
| #Populate |
| |
| #Example |
| #Image 5 |
| #Platform gpu |
| auto drawImage = [=](sk_sp<SkImage> image, const char* label) -> void { |
| if (nullptr == image) { |
| return; |
| } |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| sk_sp<SkImage> raster(image->makeRasterImage()); |
| canvas->drawImage(raster, 0, 0); |
| canvas->drawString(label, 20, raster->height() / 4, paint); |
| }; |
| sk_sp<SkImage> bitmapImage(SkImage::MakeFromBitmap(source)); |
| sk_sp<SkImage> textureImage(SkImage::MakeFromTexture(canvas->getGrContext(), backEndTexture, |
| kTopLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType, |
| kOpaque_SkAlphaType, nullptr)); |
| drawImage(image, "image"); |
| canvas->translate(image->width(), 0); |
| drawImage(bitmapImage, "source"); |
| canvas->translate(-image->width(), image->height()); |
| drawImage(textureImage, "backEndTexture"); |
| ## |
| |
| #SeeAlso isTextureBacked isLazyGenerated MakeFromRaster |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkImage> makeWithFilter(GrContext* context, |
| const SkImageFilter* filter, const SkIRect& subset, |
| const SkIRect& clipBounds, SkIRect* outSubset, |
| SkIPoint* offset) const |
| #In Constructors |
| #Line # creates filtered, clipped Image ## |
| #Populate |
| |
| #Example |
| #Description |
| In each frame of the animation, filtered Image is drawn in a different location. |
| By translating canvas by returned offset, Image appears stationary. |
| ## |
| #Image 5 |
| #Platform gpu |
| #Duration 1 |
| sk_sp<SkImageFilter> shadowFilter = SkDropShadowImageFilter::Make( |
| -10.0f * frame, 5.0f * frame, 3.0f, 3.0f, SK_ColorBLUE, |
| SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode, |
| nullptr); |
| sk_sp<SkImageFilter> offsetFilter = SkOffsetImageFilter::Make(40, 40, shadowFilter, nullptr); |
| SkIRect subset = image->bounds(); |
| SkIRect clipBounds = image->bounds(); |
| clipBounds.outset(60, 60); |
| SkIRect outSubset; |
| SkIPoint offset; |
| sk_sp<SkImage> filtered(image->makeWithFilter(canvas->getGrContext(), |
| offsetFilter.get(), subset, clipBounds, |
| &outSubset, &offset)); |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStyle(SkPaint::kStroke_Style); |
| canvas->drawLine(0, 0, offset.fX, offset.fY, paint); |
| canvas->translate(offset.fX, offset.fY); |
| canvas->drawImage(filtered, 0, 0); |
| canvas->drawRect(SkRect::Make(outSubset), paint); |
| ## |
| |
| #SeeAlso makeShader SkPaint::setImageFilter |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkImage> makeWithFilter(const SkImageFilter* filter, const SkIRect& subset, |
| const SkIRect& clipBounds, SkIRect* outSubset, |
| SkIPoint* offset) const |
| #In Constructors |
| #Line # creates filtered, clipped Image ## |
| #Populate |
| #NoExample |
| ## |
| #SeeAlso makeShader SkPaint::setImageFilter |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Typedef std::function<void(GrBackendTexture)> BackendTextureReleaseProc |
| #Line # parameter type for MakeBackendTextureFromSkImage ## |
| |
| #Code |
| #Populate |
| ## |
| |
| Defines a callback function, taking one parameter of type GrBackendTexture with |
| no return value. Function is called when back-end texture is to be released. |
| ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method static bool MakeBackendTextureFromSkImage(GrContext* context, |
| sk_sp<SkImage> image, |
| GrBackendTexture* backendTexture, |
| BackendTextureReleaseProc* backendTextureReleaseProc) |
| #In Constructors |
| #Line # creates GPU_Texture from Image ## |
| #Populate |
| |
| #Example |
| #Platform gpu |
| #Height 64 |
| #Function |
| static sk_sp<SkImage> create_gpu_image(GrContext* grContext) { |
| const SkImageInfo info = SkImageInfo::MakeN32(20, 20, kOpaque_SkAlphaType); |
| auto surface(SkSurface::MakeRenderTarget(grContext, SkBudgeted::kNo, info)); |
| SkCanvas* canvas = surface->getCanvas(); |
| canvas->clear(SK_ColorWHITE); |
| SkPaint paint; |
| paint.setColor(SK_ColorBLACK); |
| canvas->drawRect(SkRect::MakeXYWH(5, 5, 10, 10), paint); |
| return surface->makeImageSnapshot(); |
| } |
| ## |
| |
| void draw(SkCanvas* canvas) { |
| GrContext* grContext = canvas->getGrContext(); |
| if (!grContext) { |
| return; |
| } |
| sk_sp<SkImage> backEndImage = create_gpu_image(grContext); |
| canvas->drawImage(backEndImage, 0, 0); |
| GrBackendTexture texture; |
| SkImage::BackendTextureReleaseProc proc; |
| if (!SkImage::MakeBackendTextureFromSkImage(grContext, std::move(backEndImage), |
| &texture, &proc)) { |
| return; |
| } |
| sk_sp<SkImage> i2 = SkImage::MakeFromTexture(grContext, texture, kTopLeft_GrSurfaceOrigin, |
| kN32_SkColorType, kOpaque_SkAlphaType, nullptr); |
| canvas->drawImage(i2, 30, 30); |
| } |
| ## |
| |
| #SeeAlso MakeFromTexture makeTextureImage |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method bool isLazyGenerated() const |
| #In Property |
| #Line # returns if Image is created as needed ## |
| #Populate |
| |
| #Example |
| #Height 80 |
| #Function |
| class TestImageGenerator : public SkImageGenerator { |
| public: |
| TestImageGenerator() : SkImageGenerator(SkImageInfo::MakeN32Premul(10, 10)) {} |
| ~TestImageGenerator() override {} |
| protected: |
| bool onGetPixels(const SkImageInfo& info, void* pixelPtr, size_t rowBytes, |
| const Options& options) override { |
| SkPMColor* pixels = static_cast<SkPMColor*>(pixelPtr); |
| for (int y = 0; y < info.height(); ++y) { |
| for (int x = 0; x < info.width(); ++x) { |
| pixels[y * info.width() + x] = 0xff223344 + y * 0x000C0811; |
| } |
| } |
| return true; |
| } |
| }; |
| ## |
| void draw(SkCanvas* canvas) { |
| auto gen = std::unique_ptr<TestImageGenerator>(new TestImageGenerator()); |
| sk_sp<SkImage> image(SkImage::MakeFromGenerator(std::move(gen))); |
| SkString lazy(image->isLazyGenerated() ? "is lazy" : "not lazy"); |
| canvas->scale(8, 8); |
| canvas->drawImage(image, 0, 0, nullptr); |
| SkPaint paint; |
| paint.setTextSize(4); |
| canvas->drawString(lazy, 2, 5, paint); |
| } |
| ## |
| |
| #Example |
| #Image 5 |
| #Platform gpu |
| void draw(SkCanvas* canvas) { |
| auto drawImage = [=](sk_sp<SkImage> image, const char* label) -> void { |
| if (nullptr == image) { |
| return; |
| } |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| canvas->drawImage(image, 0, 0); |
| canvas->drawString(label, 30, image->height() / 4, paint); |
| canvas->drawString( |
| image->isLazyGenerated() ? "is lazily generated" : "not lazily generated", |
| 20, image->height() * 3 / 4, paint); |
| }; |
| sk_sp<SkImage> bitmapImage(SkImage::MakeFromBitmap(source)); |
| sk_sp<SkImage> textureImage(SkImage::MakeFromTexture(canvas->getGrContext(), backEndTexture, |
| kTopLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType, |
| kOpaque_SkAlphaType, nullptr)); |
| drawImage(image, "image"); |
| canvas->translate(image->width(), 0); |
| drawImage(bitmapImage, "source"); |
| canvas->translate(-image->width(), image->height()); |
| drawImage(textureImage, "backEndTexture"); |
| } |
| ## |
| |
| #SeeAlso isTextureBacked makeNonTextureImage |
| |
| #Method ## |
| |
| # ------------------------------------------------------------------------------ |
| |
| #Method sk_sp<SkImage> makeColorSpace(sk_sp<SkColorSpace> target) const |
| #In Constructors |
| #Line # creates Image matching Color_Space if possible ## |
| #Populate |
| |
| #Example |
| #Image 5 |
| #Set sRGB |
| sk_sp<SkColorSpace> normalColorSpace = SkColorSpace::MakeRGB( |
| SkNamedTransferFn::kSRGB, SkNamedGamut::kSRGB); |
| sk_sp<SkColorSpace> wackyColorSpace = normalColorSpace->makeColorSpin(); |
| for (auto colorSpace : { normalColorSpace, wackyColorSpace } ) { |
| sk_sp<SkImage> colorSpaced = image->makeColorSpace(colorSpace); |
| canvas->drawImage(colorSpaced, 0, 0); |
| canvas->translate(128, 0); |
| } |
| ## |
| |
| #SeeAlso MakeFromPicture MakeFromTexture |
| |
| #Method ## |
| |
| #Class SkImage ## |
| |
| #Topic Image ## |
