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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); | |
} |