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YYWebImage/Demo/YYWebImageDemo/YYBPGCoder.m
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| // | |
| // YYBPGCoder.m | |
| // YYKitExample | |
| // | |
| // Created by ibireme on 15/8/13. | |
| // Copyright (c) 2015 ibireme. All rights reserved. | |
| // | |
| #import "YYBPGCoder.h" | |
| #import <ImageIO/ImageIO.h> | |
| #import <Accelerate/Accelerate.h> | |
| #import <bpg/libbpg.h> | |
| #define YY_FOUR_CC(c1,c2,c3,c4) ((uint32_t)(((c4) << 24) | ((c3) << 16) | ((c2) << 8) | (c1))) | |
| /// Returns byte-aligned size. | |
| static inline size_t _YYImageByteAlign(size_t size, size_t alignment) { | |
| return ((size + (alignment - 1)) / alignment) * alignment; | |
| } | |
| /** | |
| A callback used in CGDataProviderCreateWithData() to release data. | |
| Example: | |
| void *data = malloc(size); | |
| CGDataProviderRef provider = CGDataProviderCreateWithData(data, data, size, YYCGDataProviderReleaseDataCallback); | |
| */ | |
| static void _YYCGDataProviderReleaseDataCallback(void *info, const void *data, size_t size) { | |
| free(info); | |
| } | |
| CGImageRef YYCGImageCreateWithBPGData(CFDataRef bpgData, BOOL decodeForDisplay) { | |
| BPGDecoderContext *decoderContext = NULL; | |
| BPGImageInfo imageInfo = {0}; | |
| size_t width, height, lineSize, stride, size; | |
| uint8_t *rgbaLine = NULL, *rgbaBuffer = NULL; | |
| CGDataProviderRef dataProvider = NULL; | |
| CGImageRef cgImage = NULL; | |
| CGBitmapInfo bitmapInfo; | |
| if (!bpgData || CFDataGetLength(bpgData) == 0) return NULL; | |
| decoderContext = bpg_decoder_open(); | |
| if (!decoderContext) return NULL; | |
| if (bpg_decoder_decode(decoderContext, CFDataGetBytePtr(bpgData), (int)CFDataGetLength(bpgData)) < 0) goto fail; | |
| if (bpg_decoder_get_info(decoderContext, &imageInfo) < 0) goto fail; | |
| width = imageInfo.width; | |
| height = imageInfo.height; | |
| lineSize = 4 * width; | |
| stride = _YYImageByteAlign(lineSize, 32); | |
| size = stride * height; | |
| if (width == 0 || height == 0) goto fail; | |
| rgbaLine = malloc(lineSize); | |
| if (!rgbaLine) goto fail; | |
| rgbaBuffer = malloc(size); | |
| if (!rgbaBuffer) goto fail; | |
| if (bpg_decoder_start(decoderContext, BPG_OUTPUT_FORMAT_RGBA32) < 0) goto fail; | |
| for (int y = 0; y < height; y++) { | |
| if (bpg_decoder_get_line(decoderContext, rgbaLine) < 0) goto fail; | |
| memcpy(rgbaBuffer + (y * stride), rgbaLine, lineSize); | |
| } | |
| free(rgbaLine); | |
| rgbaLine = NULL; | |
| bpg_decoder_close(decoderContext); | |
| decoderContext = NULL; | |
| if (decodeForDisplay) { | |
| vImage_Buffer src; | |
| src.data = rgbaBuffer; | |
| src.width = width; | |
| src.height = height; | |
| src.rowBytes = stride; | |
| vImage_Error error; | |
| // premultiply RGBA | |
| error = vImagePremultiplyData_RGBA8888(&src, &src, kvImageNoFlags); | |
| if (error != kvImageNoError) goto fail; | |
| // convert to bgrA | |
| uint8_t map[4] = {2,1,0,3}; | |
| error = vImagePermuteChannels_ARGB8888(&src, &src, map, kvImageNoFlags); | |
| if (error != kvImageNoError) goto fail; | |
| bitmapInfo = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host; | |
| } else { | |
| bitmapInfo = kCGImageAlphaLast | kCGBitmapByteOrderDefault; | |
| } | |
| dataProvider = CGDataProviderCreateWithData(rgbaBuffer, rgbaBuffer, size, _YYCGDataProviderReleaseDataCallback); | |
| if (!dataProvider) goto fail; | |
| rgbaBuffer = NULL; // hold by provider | |
| cgImage = CGImageCreate(width, height, 8, 32, stride, YYCGColorSpaceGetDeviceRGB(), | |
| bitmapInfo, dataProvider, NULL, NO, | |
| kCGRenderingIntentDefault); | |
| CGDataProviderRelease(dataProvider); | |
| return cgImage; | |
| fail: | |
| if (decoderContext) bpg_decoder_close(decoderContext); | |
| if (rgbaLine) free(rgbaLine); | |
| if (rgbaBuffer) free(rgbaBuffer); | |
| return NULL; | |
| } | |
| CGImageRef YYCGImageCreateFrameWithBPGData(CFDataRef bpgData, NSUInteger frameIndex, BOOL decodeForDisplay) { | |
| BPGDecoderContext *decoderContext = NULL; | |
| BPGImageInfo imageInfo = {0}; | |
| size_t width, height, lineSize, stride, size; | |
| uint8_t *rgbaLine = NULL, *rgbaBuffer = NULL; | |
| CGDataProviderRef dataProvider = NULL; | |
| CGImageRef cgImage = NULL; | |
| CGBitmapInfo bitmapInfo; | |
| if (!bpgData || CFDataGetLength(bpgData) == 0) return NULL; | |
| decoderContext = bpg_decoder_open(); | |
| if (!decoderContext) return NULL; | |
| if (bpg_decoder_decode(decoderContext, CFDataGetBytePtr(bpgData), (int)CFDataGetLength(bpgData)) < 0) goto fail; | |
| if (bpg_decoder_get_info(decoderContext, &imageInfo) < 0) goto fail; | |
| width = imageInfo.width; | |
| height = imageInfo.height; | |
| lineSize = 4 * width; | |
| stride = _YYImageByteAlign(lineSize, 32); | |
| size = stride * height; | |
| if (width == 0 || height == 0) goto fail; | |
| rgbaLine = malloc(lineSize); | |
| if (!rgbaLine) goto fail; | |
| rgbaBuffer = malloc(size); | |
| if (!rgbaBuffer) goto fail; | |
| for (NSUInteger i = 0; i <= frameIndex; i++) { | |
| if (bpg_decoder_start(decoderContext, BPG_OUTPUT_FORMAT_RGBA32) < 0) goto fail; | |
| } | |
| for (int y = 0; y < height; y++) { | |
| if (bpg_decoder_get_line(decoderContext, rgbaLine) < 0) goto fail; | |
| memcpy(rgbaBuffer + (y * stride), rgbaLine, lineSize); | |
| } | |
| free(rgbaLine); | |
| rgbaLine = NULL; | |
| bpg_decoder_close(decoderContext); | |
| decoderContext = NULL; | |
| if (decodeForDisplay) { | |
| vImage_Buffer src; | |
| src.data = rgbaBuffer; | |
| src.width = width; | |
| src.height = height; | |
| src.rowBytes = stride; | |
| vImage_Error error; | |
| // premultiply RGBA | |
| error = vImagePremultiplyData_RGBA8888(&src, &src, kvImageNoFlags); | |
| if (error != kvImageNoError) goto fail; | |
| // convert to BGRA | |
| uint8_t map[4] = {2,1,0,3}; | |
| error = vImagePermuteChannels_ARGB8888(&src, &src, map, kvImageNoFlags); | |
| if (error != kvImageNoError) goto fail; | |
| bitmapInfo = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host; | |
| } else { | |
| bitmapInfo = kCGImageAlphaLast | kCGBitmapByteOrderDefault; | |
| } | |
| dataProvider = CGDataProviderCreateWithData(rgbaBuffer, rgbaBuffer, size, _YYCGDataProviderReleaseDataCallback); | |
| if (!dataProvider) goto fail; | |
| rgbaBuffer = NULL; // hold by provider | |
| cgImage = CGImageCreate(width, height, 8, 32, stride, YYCGColorSpaceGetDeviceRGB(), | |
| bitmapInfo, dataProvider, NULL, NO, | |
| kCGRenderingIntentDefault); | |
| CGDataProviderRelease(dataProvider); | |
| return cgImage; | |
| fail: | |
| if (decoderContext) bpg_decoder_close(decoderContext); | |
| if (rgbaLine) free(rgbaLine); | |
| if (rgbaBuffer) free(rgbaBuffer); | |
| return NULL; | |
| } | |
| void YYCGImageDecodeAllFrameInBPGData(CFDataRef bpgData, BOOL decodeForDisplay) { | |
| BPGDecoderContext *decoderContext = NULL; | |
| BPGImageInfo imageInfo = {0}; | |
| size_t width, height, lineSize, stride, size; | |
| uint8_t *rgbaLine = NULL, *rgbaBuffer = NULL; | |
| CGDataProviderRef dataProvider = NULL; | |
| CGImageRef cgImage = NULL; | |
| CGBitmapInfo bitmapInfo; | |
| if (!bpgData || CFDataGetLength(bpgData) == 0) return; | |
| decoderContext = bpg_decoder_open(); | |
| if (!decoderContext) return; | |
| if (bpg_decoder_decode(decoderContext, CFDataGetBytePtr(bpgData), (int)CFDataGetLength(bpgData)) < 0) goto end; | |
| if (bpg_decoder_get_info(decoderContext, &imageInfo) < 0) goto end; | |
| width = imageInfo.width; | |
| height = imageInfo.height; | |
| lineSize = 4 * width; | |
| stride = _YYImageByteAlign(lineSize, 32); | |
| size = stride * height; | |
| for (;;) { | |
| if (bpg_decoder_start(decoderContext, BPG_OUTPUT_FORMAT_RGBA32) < 0) goto end; | |
| if (width == 0 || height == 0) goto end; | |
| rgbaLine = malloc(lineSize); | |
| if (!rgbaLine) goto end; | |
| rgbaBuffer = malloc(size); | |
| if (!rgbaBuffer) goto end; | |
| for (int y = 0; y < height; y++) { | |
| if (bpg_decoder_get_line(decoderContext, rgbaLine) < 0) goto end; | |
| memcpy(rgbaBuffer + (y * stride), rgbaLine, lineSize); | |
| } | |
| free(rgbaLine); | |
| rgbaLine = NULL; | |
| if (decodeForDisplay) { | |
| vImage_Buffer src; | |
| src.data = rgbaBuffer; | |
| src.width = width; | |
| src.height = height; | |
| src.rowBytes = stride; | |
| vImage_Error error; | |
| // premultiply RGBA | |
| error = vImagePremultiplyData_RGBA8888(&src, &src, kvImageNoFlags); | |
| if (error != kvImageNoError) goto end; | |
| // convert to BGRA | |
| uint8_t map[4] = {2,1,0,3}; | |
| error = vImagePermuteChannels_ARGB8888(&src, &src, map, kvImageNoFlags); | |
| if (error != kvImageNoError) goto end; | |
| bitmapInfo = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host; | |
| } else { | |
| bitmapInfo = kCGImageAlphaLast | kCGBitmapByteOrderDefault; | |
| } | |
| dataProvider = CGDataProviderCreateWithData(rgbaBuffer, rgbaBuffer, size, _YYCGDataProviderReleaseDataCallback); | |
| if (!dataProvider) goto end; | |
| rgbaBuffer = NULL; // hold by provider | |
| cgImage = CGImageCreate(width, height, 8, 32, stride, YYCGColorSpaceGetDeviceRGB(), | |
| bitmapInfo, dataProvider, NULL, NO, | |
| kCGRenderingIntentDefault); | |
| CGDataProviderRelease(dataProvider); | |
| if (cgImage) CFRelease(cgImage); | |
| } | |
| return; | |
| end: | |
| if (decoderContext) bpg_decoder_close(decoderContext); | |
| if (rgbaLine) free(rgbaLine); | |
| if (rgbaBuffer) free(rgbaBuffer); | |
| return; | |
| } | |
| BOOL YYImageIsBPGData(CFDataRef data) { | |
| if (!data || CFDataGetLength(data) < 8) return NO; | |
| const uint8_t *bytes = CFDataGetBytePtr(data); | |
| uint32_t magic = *((uint32_t *)bytes); | |
| return magic == YY_FOUR_CC('B', 'P', 'G', 0xFB); | |
| } |