Permalink
Cannot retrieve contributors at this time
Join GitHub today
GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.
Sign up| // | |
| // 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); | |
| } |