diff options
Diffstat (limited to 'media/libwebp/webp/encode.h')
| -rw-r--r-- | media/libwebp/webp/encode.h | 131 |
1 files changed, 67 insertions, 64 deletions
diff --git a/media/libwebp/webp/encode.h b/media/libwebp/webp/encode.h index 35fde1d05..7ec3543dc 100644 --- a/media/libwebp/webp/encode.h +++ b/media/libwebp/webp/encode.h @@ -35,7 +35,7 @@ typedef struct WebPMemoryWriter WebPMemoryWriter; // Return the encoder's version number, packed in hexadecimal using 8bits for // each of major/minor/revision. E.g: v2.5.7 is 0x020507. -WEBP_EXTERN(int) WebPGetEncoderVersion(void); +WEBP_EXTERN int WebPGetEncoderVersion(void); //------------------------------------------------------------------------------ // One-stop-shop call! No questions asked: @@ -46,37 +46,37 @@ WEBP_EXTERN(int) WebPGetEncoderVersion(void); // These functions compress using the lossy format, and the quality_factor // can go from 0 (smaller output, lower quality) to 100 (best quality, // larger output). -WEBP_EXTERN(size_t) WebPEncodeRGB(const uint8_t* rgb, +WEBP_EXTERN size_t WebPEncodeRGB(const uint8_t* rgb, + int width, int height, int stride, + float quality_factor, uint8_t** output); +WEBP_EXTERN size_t WebPEncodeBGR(const uint8_t* bgr, + int width, int height, int stride, + float quality_factor, uint8_t** output); +WEBP_EXTERN size_t WebPEncodeRGBA(const uint8_t* rgba, int width, int height, int stride, float quality_factor, uint8_t** output); -WEBP_EXTERN(size_t) WebPEncodeBGR(const uint8_t* bgr, +WEBP_EXTERN size_t WebPEncodeBGRA(const uint8_t* bgra, int width, int height, int stride, float quality_factor, uint8_t** output); -WEBP_EXTERN(size_t) WebPEncodeRGBA(const uint8_t* rgba, - int width, int height, int stride, - float quality_factor, uint8_t** output); -WEBP_EXTERN(size_t) WebPEncodeBGRA(const uint8_t* bgra, - int width, int height, int stride, - float quality_factor, uint8_t** output); // These functions are the equivalent of the above, but compressing in a // lossless manner. Files are usually larger than lossy format, but will // not suffer any compression loss. -WEBP_EXTERN(size_t) WebPEncodeLosslessRGB(const uint8_t* rgb, +WEBP_EXTERN size_t WebPEncodeLosslessRGB(const uint8_t* rgb, + int width, int height, int stride, + uint8_t** output); +WEBP_EXTERN size_t WebPEncodeLosslessBGR(const uint8_t* bgr, + int width, int height, int stride, + uint8_t** output); +WEBP_EXTERN size_t WebPEncodeLosslessRGBA(const uint8_t* rgba, int width, int height, int stride, uint8_t** output); -WEBP_EXTERN(size_t) WebPEncodeLosslessBGR(const uint8_t* bgr, +WEBP_EXTERN size_t WebPEncodeLosslessBGRA(const uint8_t* bgra, int width, int height, int stride, uint8_t** output); -WEBP_EXTERN(size_t) WebPEncodeLosslessRGBA(const uint8_t* rgba, - int width, int height, int stride, - uint8_t** output); -WEBP_EXTERN(size_t) WebPEncodeLosslessBGRA(const uint8_t* bgra, - int width, int height, int stride, - uint8_t** output); // Releases memory returned by the WebPEncode*() functions above. -WEBP_EXTERN(void) WebPFree(void* ptr); +WEBP_EXTERN void WebPFree(void* ptr); //------------------------------------------------------------------------------ // Coding parameters @@ -93,12 +93,15 @@ typedef enum WebPImageHint { // Compression parameters. struct WebPConfig { int lossless; // Lossless encoding (0=lossy(default), 1=lossless). - float quality; // between 0 (smallest file) and 100 (biggest) + float quality; // between 0 and 100. For lossy, 0 gives the smallest + // size and 100 the largest. For lossless, this + // parameter is the amount of effort put into the + // compression: 0 is the fastest but gives larger + // files compared to the slowest, but best, 100. int method; // quality/speed trade-off (0=fast, 6=slower-better) WebPImageHint image_hint; // Hint for image type (lossless only for now). - // Parameters related to lossy compression only: int target_size; // if non-zero, set the desired target size in bytes. // Takes precedence over the 'compression' parameter. float target_PSNR; // if non-zero, specifies the minimal distortion to @@ -159,7 +162,7 @@ typedef enum WebPPreset { } WebPPreset; // Internal, version-checked, entry point -WEBP_EXTERN(int) WebPConfigInitInternal(WebPConfig*, WebPPreset, float, int); +WEBP_EXTERN int WebPConfigInitInternal(WebPConfig*, WebPPreset, float, int); // Should always be called, to initialize a fresh WebPConfig structure before // modification. Returns false in case of version mismatch. WebPConfigInit() @@ -186,15 +189,15 @@ static WEBP_INLINE int WebPConfigPreset(WebPConfig* config, // speed and final compressed size. // This function will overwrite several fields from config: 'method', 'quality' // and 'lossless'. Returns false in case of parameter error. -WEBP_EXTERN(int) WebPConfigLosslessPreset(WebPConfig* config, int level); +WEBP_EXTERN int WebPConfigLosslessPreset(WebPConfig* config, int level); // Returns true if 'config' is non-NULL and all configuration parameters are // within their valid ranges. -WEBP_EXTERN(int) WebPValidateConfig(const WebPConfig* config); +WEBP_EXTERN int WebPValidateConfig(const WebPConfig* config); //------------------------------------------------------------------------------ // Input / Output -// Structure for storing auxiliary statistics (mostly for lossy encoding). +// Structure for storing auxiliary statistics. struct WebPAuxStats { int coded_size; // final size @@ -242,16 +245,16 @@ struct WebPMemoryWriter { }; // The following must be called first before any use. -WEBP_EXTERN(void) WebPMemoryWriterInit(WebPMemoryWriter* writer); +WEBP_EXTERN void WebPMemoryWriterInit(WebPMemoryWriter* writer); // The following must be called to deallocate writer->mem memory. The 'writer' // object itself is not deallocated. -WEBP_EXTERN(void) WebPMemoryWriterClear(WebPMemoryWriter* writer); +WEBP_EXTERN void WebPMemoryWriterClear(WebPMemoryWriter* writer); // The custom writer to be used with WebPMemoryWriter as custom_ptr. Upon // completion, writer.mem and writer.size will hold the coded data. // writer.mem must be freed by calling WebPMemoryWriterClear. -WEBP_EXTERN(int) WebPMemoryWrite(const uint8_t* data, size_t data_size, - const WebPPicture* picture); +WEBP_EXTERN int WebPMemoryWrite(const uint8_t* data, size_t data_size, + const WebPPicture* picture); // Progress hook, called from time to time to report progress. It can return // false to request an abort of the encoding process, or true otherwise if @@ -354,7 +357,7 @@ struct WebPPicture { }; // Internal, version-checked, entry point -WEBP_EXTERN(int) WebPPictureInitInternal(WebPPicture*, int); +WEBP_EXTERN int WebPPictureInitInternal(WebPPicture*, int); // Should always be called, to initialize the structure. Returns false in case // of version mismatch. WebPPictureInit() must have succeeded before using the @@ -371,20 +374,20 @@ static WEBP_INLINE int WebPPictureInit(WebPPicture* picture) { // Allocate y/u/v buffers as per colorspace/width/height specification. // Note! This function will free the previous buffer if needed. // Returns false in case of memory error. -WEBP_EXTERN(int) WebPPictureAlloc(WebPPicture* picture); +WEBP_EXTERN int WebPPictureAlloc(WebPPicture* picture); // Release the memory allocated by WebPPictureAlloc() or WebPPictureImport*(). // Note that this function does _not_ free the memory used by the 'picture' // object itself. // Besides memory (which is reclaimed) all other fields of 'picture' are // preserved. -WEBP_EXTERN(void) WebPPictureFree(WebPPicture* picture); +WEBP_EXTERN void WebPPictureFree(WebPPicture* picture); // Copy the pixels of *src into *dst, using WebPPictureAlloc. Upon return, *dst // will fully own the copied pixels (this is not a view). The 'dst' picture need // not be initialized as its content is overwritten. // Returns false in case of memory allocation error. -WEBP_EXTERN(int) WebPPictureCopy(const WebPPicture* src, WebPPicture* dst); +WEBP_EXTERN int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst); // Compute the single distortion for packed planes of samples. // 'src' will be compared to 'ref', and the raw distortion stored into @@ -393,19 +396,19 @@ WEBP_EXTERN(int) WebPPictureCopy(const WebPPicture* src, WebPPicture* dst); // 'x_step' is the horizontal stride (in bytes) between samples. // 'src/ref_stride' is the byte distance between rows. // Returns false in case of error (bad parameter, memory allocation error, ...). -WEBP_EXTERN(int) WebPPlaneDistortion(const uint8_t* src, size_t src_stride, - const uint8_t* ref, size_t ref_stride, - int width, int height, - size_t x_step, - int type, // 0 = PSNR, 1 = SSIM, 2 = LSIM - float* distortion, float* result); +WEBP_EXTERN int WebPPlaneDistortion(const uint8_t* src, size_t src_stride, + const uint8_t* ref, size_t ref_stride, + int width, int height, + size_t x_step, + int type, // 0 = PSNR, 1 = SSIM, 2 = LSIM + float* distortion, float* result); // Compute PSNR, SSIM or LSIM distortion metric between two pictures. Results // are in dB, stored in result[] in the B/G/R/A/All order. The distortion is // always performed using ARGB samples. Hence if the input is YUV(A), the // picture will be internally converted to ARGB (just for the measurement). // Warning: this function is rather CPU-intensive. -WEBP_EXTERN(int) WebPPictureDistortion( +WEBP_EXTERN int WebPPictureDistortion( const WebPPicture* src, const WebPPicture* ref, int metric_type, // 0 = PSNR, 1 = SSIM, 2 = LSIM float result[5]); @@ -418,8 +421,8 @@ WEBP_EXTERN(int) WebPPictureDistortion( // must be fully be comprised inside the 'src' source picture. If the source // picture uses the YUV420 colorspace, the top and left coordinates will be // snapped to even values. -WEBP_EXTERN(int) WebPPictureCrop(WebPPicture* picture, - int left, int top, int width, int height); +WEBP_EXTERN int WebPPictureCrop(WebPPicture* picture, + int left, int top, int width, int height); // Extracts a view from 'src' picture into 'dst'. The rectangle for the view // is defined by the top-left corner pixel coordinates (left, top) as well @@ -432,42 +435,42 @@ WEBP_EXTERN(int) WebPPictureCrop(WebPPicture* picture, // with WebPPictureInit() if it is different from 'src', since its content will // be overwritten. // Returns false in case of memory allocation error or invalid parameters. -WEBP_EXTERN(int) WebPPictureView(const WebPPicture* src, - int left, int top, int width, int height, - WebPPicture* dst); +WEBP_EXTERN int WebPPictureView(const WebPPicture* src, + int left, int top, int width, int height, + WebPPicture* dst); // Returns true if the 'picture' is actually a view and therefore does // not own the memory for pixels. -WEBP_EXTERN(int) WebPPictureIsView(const WebPPicture* picture); +WEBP_EXTERN int WebPPictureIsView(const WebPPicture* picture); // Rescale a picture to new dimension width x height. // If either 'width' or 'height' (but not both) is 0 the corresponding // dimension will be calculated preserving the aspect ratio. // No gamma correction is applied. // Returns false in case of error (invalid parameter or insufficient memory). -WEBP_EXTERN(int) WebPPictureRescale(WebPPicture* pic, int width, int height); +WEBP_EXTERN int WebPPictureRescale(WebPPicture* pic, int width, int height); // Colorspace conversion function to import RGB samples. // Previous buffer will be free'd, if any. // *rgb buffer should have a size of at least height * rgb_stride. // Returns false in case of memory error. -WEBP_EXTERN(int) WebPPictureImportRGB( +WEBP_EXTERN int WebPPictureImportRGB( WebPPicture* picture, const uint8_t* rgb, int rgb_stride); // Same, but for RGBA buffer. -WEBP_EXTERN(int) WebPPictureImportRGBA( +WEBP_EXTERN int WebPPictureImportRGBA( WebPPicture* picture, const uint8_t* rgba, int rgba_stride); // Same, but for RGBA buffer. Imports the RGB direct from the 32-bit format // input buffer ignoring the alpha channel. Avoids needing to copy the data // to a temporary 24-bit RGB buffer to import the RGB only. -WEBP_EXTERN(int) WebPPictureImportRGBX( +WEBP_EXTERN int WebPPictureImportRGBX( WebPPicture* picture, const uint8_t* rgbx, int rgbx_stride); // Variants of the above, but taking BGR(A|X) input. -WEBP_EXTERN(int) WebPPictureImportBGR( +WEBP_EXTERN int WebPPictureImportBGR( WebPPicture* picture, const uint8_t* bgr, int bgr_stride); -WEBP_EXTERN(int) WebPPictureImportBGRA( +WEBP_EXTERN int WebPPictureImportBGRA( WebPPicture* picture, const uint8_t* bgra, int bgra_stride); -WEBP_EXTERN(int) WebPPictureImportBGRX( +WEBP_EXTERN int WebPPictureImportBGRX( WebPPicture* picture, const uint8_t* bgrx, int bgrx_stride); // Converts picture->argb data to the YUV420A format. The 'colorspace' @@ -476,14 +479,14 @@ WEBP_EXTERN(int) WebPPictureImportBGRX( // non-opaque transparent values is detected, and 'colorspace' will be // adjusted accordingly. Note that this method is lossy. // Returns false in case of error. -WEBP_EXTERN(int) WebPPictureARGBToYUVA(WebPPicture* picture, - WebPEncCSP /*colorspace = WEBP_YUV420*/); +WEBP_EXTERN int WebPPictureARGBToYUVA(WebPPicture* picture, + WebPEncCSP /*colorspace = WEBP_YUV420*/); // Same as WebPPictureARGBToYUVA(), but the conversion is done using // pseudo-random dithering with a strength 'dithering' between // 0.0 (no dithering) and 1.0 (maximum dithering). This is useful // for photographic picture. -WEBP_EXTERN(int) WebPPictureARGBToYUVADithered( +WEBP_EXTERN int WebPPictureARGBToYUVADithered( WebPPicture* picture, WebPEncCSP colorspace, float dithering); // Performs 'sharp' RGBA->YUVA420 downsampling and colorspace conversion. @@ -491,9 +494,9 @@ WEBP_EXTERN(int) WebPPictureARGBToYUVADithered( // method is roughly 2x slower than WebPPictureARGBToYUVA() but produces better // and sharper YUV representation. // Returns false in case of error. -WEBP_EXTERN(int) WebPPictureSharpARGBToYUVA(WebPPicture* picture); +WEBP_EXTERN int WebPPictureSharpARGBToYUVA(WebPPicture* picture); // kept for backward compatibility: -WEBP_EXTERN(int) WebPPictureSmartARGBToYUVA(WebPPicture* picture); +WEBP_EXTERN int WebPPictureSmartARGBToYUVA(WebPPicture* picture); // Converts picture->yuv to picture->argb and sets picture->use_argb to true. // The input format must be YUV_420 or YUV_420A. The conversion from YUV420 to @@ -501,22 +504,22 @@ WEBP_EXTERN(int) WebPPictureSmartARGBToYUVA(WebPPicture* picture); // Note that the use of this colorspace is discouraged if one has access to the // raw ARGB samples, since using YUV420 is comparatively lossy. // Returns false in case of error. -WEBP_EXTERN(int) WebPPictureYUVAToARGB(WebPPicture* picture); +WEBP_EXTERN int WebPPictureYUVAToARGB(WebPPicture* picture); // Helper function: given a width x height plane of RGBA or YUV(A) samples -// clean-up the YUV or RGB samples under fully transparent area, to help -// compressibility (no guarantee, though). -WEBP_EXTERN(void) WebPCleanupTransparentArea(WebPPicture* picture); +// clean-up or smoothen the YUV or RGB samples under fully transparent area, +// to help compressibility (no guarantee, though). +WEBP_EXTERN void WebPCleanupTransparentArea(WebPPicture* picture); // Scan the picture 'picture' for the presence of non fully opaque alpha values. // Returns true in such case. Otherwise returns false (indicating that the // alpha plane can be ignored altogether e.g.). -WEBP_EXTERN(int) WebPPictureHasTransparency(const WebPPicture* picture); +WEBP_EXTERN int WebPPictureHasTransparency(const WebPPicture* picture); // Remove the transparency information (if present) by blending the color with // the background color 'background_rgb' (specified as 24bit RGB triplet). // After this call, all alpha values are reset to 0xff. -WEBP_EXTERN(void) WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb); +WEBP_EXTERN void WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb); //------------------------------------------------------------------------------ // Main call @@ -531,7 +534,7 @@ WEBP_EXTERN(void) WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb); // the former for lossy encoding, and the latter for lossless encoding // (when config.lossless is true). Automatic conversion from one format to // another is provided but they both incur some loss. -WEBP_EXTERN(int) WebPEncode(const WebPConfig* config, WebPPicture* picture); +WEBP_EXTERN int WebPEncode(const WebPConfig* config, WebPPicture* picture); //------------------------------------------------------------------------------ |