From ae2c20f398933a9e86c387dcc465ec0f71065ffc Mon Sep 17 00:00:00 2001 From: "initial.commit" Date: Sun, 27 Jul 2008 00:09:42 +0000 Subject: Add skia to the repository. git-svn-id: svn://svn.chromium.org/chrome/trunk/src@16 0039d316-1c4b-4281-b951-d872f2087c98 --- skia/images/SkImageDecoder_libjpeg.cpp | 654 +++++++++++++++++++++++++++++++++ 1 file changed, 654 insertions(+) create mode 100644 skia/images/SkImageDecoder_libjpeg.cpp (limited to 'skia/images/SkImageDecoder_libjpeg.cpp') diff --git a/skia/images/SkImageDecoder_libjpeg.cpp b/skia/images/SkImageDecoder_libjpeg.cpp new file mode 100644 index 0000000..0d8da7ef --- /dev/null +++ b/skia/images/SkImageDecoder_libjpeg.cpp @@ -0,0 +1,654 @@ +/* + * Copyright 2007, Google Inc. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "SkImageDecoder.h" +#include "SkColorPriv.h" +#include "SkDither.h" +#include "SkScaledBitmapSampler.h" +#include "SkStream.h" +#include "SkTemplates.h" +#include "SkUtils.h" + +#include +extern "C" { + #include "jpeglib.h" +} + +// this enables timing code to report milliseconds for an encode +//#define TIME_ENCODE +//#define TIME_DECODE + +// this enables our rgb->yuv code, which is faster than libjpeg on ARM +// disable for the moment, as we have some glitches when width != multiple of 4 +#define WE_CONVERT_TO_YUV + +////////////////////////////////////////////////////////////////////////// +////////////////////////////////////////////////////////////////////////// + +class SkJPEGImageDecoder : public SkImageDecoder { +public: + virtual Format getFormat() const { + return kJPEG_Format; + } + +protected: + virtual bool onDecode(SkStream* stream, SkBitmap* bm, + SkBitmap::Config pref, Mode); +}; + +SkImageDecoder* SkImageDecoder_JPEG_Factory(SkStream* stream) { + // !!! unimplemented; rely on PNG test first for now + return SkNEW(SkJPEGImageDecoder); +} + +////////////////////////////////////////////////////////////////////////// + +#include "SkTime.h" + +class AutoTimeMillis { +public: + AutoTimeMillis(const char label[]) : fLabel(label) { + if (!fLabel) { + fLabel = ""; + } + fNow = SkTime::GetMSecs(); + } + ~AutoTimeMillis() { + SkDebugf("---- Time (ms): %s %d\n", fLabel, SkTime::GetMSecs() - fNow); + } +private: + const char* fLabel; + SkMSec fNow; +}; + +/* our source struct for directing jpeg to our stream object +*/ +struct sk_source_mgr : jpeg_source_mgr { + sk_source_mgr(SkStream* stream); + + SkStream* fStream; + + enum { + kBufferSize = 1024 + }; + char fBuffer[kBufferSize]; +}; + +/* Automatically clean up after throwing an exception */ +class JPEGAutoClean { +public: + JPEGAutoClean(): cinfo_ptr(NULL) {} + ~JPEGAutoClean() { + if (cinfo_ptr) { + jpeg_destroy_decompress(cinfo_ptr); + } + } + void set(jpeg_decompress_struct* info) { + cinfo_ptr = info; + } +private: + jpeg_decompress_struct* cinfo_ptr; +}; + +static void sk_init_source(j_decompress_ptr cinfo) { + sk_source_mgr* src = (sk_source_mgr*)cinfo->src; + src->next_input_byte = (const JOCTET*)src->fBuffer; + src->bytes_in_buffer = 0; +} + +static boolean sk_fill_input_buffer(j_decompress_ptr cinfo) { + sk_source_mgr* src = (sk_source_mgr*)cinfo->src; + size_t bytes = src->fStream->read(src->fBuffer, sk_source_mgr::kBufferSize); + // note that JPEG is happy with less than the full read, + // as long as the result is non-zero + if (bytes == 0) { + cinfo->err->error_exit((j_common_ptr)cinfo); + return FALSE; + } + + src->next_input_byte = (const JOCTET*)src->fBuffer; + src->bytes_in_buffer = bytes; + return TRUE; +} + +static void sk_skip_input_data(j_decompress_ptr cinfo, long num_bytes) { + SkASSERT(num_bytes > 0); + + sk_source_mgr* src = (sk_source_mgr*)cinfo->src; + + long skip = num_bytes - src->bytes_in_buffer; + + if (skip > 0) { + size_t bytes = src->fStream->read(NULL, skip); + if (bytes != (size_t)skip) { + cinfo->err->error_exit((j_common_ptr)cinfo); + } + src->next_input_byte = (const JOCTET*)src->fBuffer; + src->bytes_in_buffer = 0; + } else { + src->next_input_byte += num_bytes; + src->bytes_in_buffer -= num_bytes; + } +} + +static boolean sk_resync_to_restart(j_decompress_ptr cinfo, int desired) { + sk_source_mgr* src = (sk_source_mgr*)cinfo->src; + + // what is the desired param for??? + + if (!src->fStream->rewind()) { + printf("------------- sk_resync_to_restart: stream->rewind() failed\n"); + cinfo->err->error_exit((j_common_ptr)cinfo); + return FALSE; + } + return TRUE; +} + +static void sk_term_source(j_decompress_ptr /*cinfo*/) {} + +sk_source_mgr::sk_source_mgr(SkStream* stream) + : fStream(stream) { + init_source = sk_init_source; + fill_input_buffer = sk_fill_input_buffer; + skip_input_data = sk_skip_input_data; + resync_to_restart = sk_resync_to_restart; + term_source = sk_term_source; +} + +#include + +struct sk_error_mgr : jpeg_error_mgr { + jmp_buf fJmpBuf; +}; + +static void sk_error_exit(j_common_ptr cinfo) { + sk_error_mgr* error = (sk_error_mgr*)cinfo->err; + + (*error->output_message) (cinfo); + + /* Let the memory manager delete any temp files before we die */ + jpeg_destroy(cinfo); + + longjmp(error->fJmpBuf, -1); +} + +/////////////////////////////////////////////////////////////////////////////// + +static void skip_src_rows(jpeg_decompress_struct* cinfo, void* buffer, + int count) { + for (int i = 0; i < count; i++) { + JSAMPLE* rowptr = (JSAMPLE*)buffer; + int row_count = jpeg_read_scanlines(cinfo, &rowptr, 1); + SkASSERT(row_count == 1); + } +} + +bool SkJPEGImageDecoder::onDecode(SkStream* stream, SkBitmap* bm, + SkBitmap::Config prefConfig, Mode mode) { +#ifdef TIME_DECODE + AutoTimeMillis atm("JPEG Decode"); +#endif + + SkAutoMalloc srcStorage; + JPEGAutoClean autoClean; + + jpeg_decompress_struct cinfo; + sk_error_mgr sk_err; + sk_source_mgr sk_stream(stream); + + cinfo.err = jpeg_std_error(&sk_err); + sk_err.error_exit = sk_error_exit; + + // All objects need to be instantiated before this setjmp call so that + // they will be cleaned up properly if an error occurs. + if (setjmp(sk_err.fJmpBuf)) { + return false; + } + + jpeg_create_decompress(&cinfo); + autoClean.set(&cinfo); + + //jpeg_stdio_src(&cinfo, file); + cinfo.src = &sk_stream; + + jpeg_read_header(&cinfo, true); + + /* Try to fulfill the requested sampleSize. Since jpeg can do it (when it + can) much faster that we, just use their num/denom api to approximate + the size. + */ + int sampleSize = this->getSampleSize(); + + cinfo.dct_method = JDCT_IFAST; + cinfo.scale_num = 1; + cinfo.scale_denom = sampleSize; + + /* image_width and image_height are the original dimensions, available + after jpeg_read_header(). To see the scaled dimensions, we have to call + jpeg_start_decompress(), and then read output_width and output_height. + */ + jpeg_start_decompress(&cinfo); + + /* If we need to better match the request, we might examine the image and + output dimensions, and determine if the downsampling jpeg provided is + not sufficient. If so, we can recompute a modified sampleSize value to + make up the difference. + + To skip this additional scaling, just set sampleSize = 1; below. + */ + sampleSize = sampleSize * cinfo.output_width / cinfo.image_width; + + // check for supported formats + bool isRGB; // as opposed to gray8 + if (3 == cinfo.num_components && JCS_RGB == cinfo.out_color_space) { + isRGB = true; + } else if (1 == cinfo.num_components && + JCS_GRAYSCALE == cinfo.out_color_space) { + isRGB = false; // could use Index8 config if we want... + } else { + SkDEBUGF(("SkJPEGImageDecoder: unsupported jpeg colorspace %d with %d components\n", + cinfo.jpeg_color_space, cinfo.num_components)); + return false; + } + + SkBitmap::Config config = prefConfig; + // if no user preference, see what the device recommends + if (config == SkBitmap::kNo_Config) + config = SkImageDecoder::GetDeviceConfig(); + + // only these make sense for jpegs + if (config != SkBitmap::kARGB_8888_Config && + config != SkBitmap::kARGB_4444_Config && + config != SkBitmap::kRGB_565_Config) { + config = SkBitmap::kARGB_8888_Config; + } + + // should we allow the Chooser (if present) to pick a config for us??? + if (!this->chooseFromOneChoice(config, cinfo.output_width, + cinfo.output_height)) { + return false; + } + + SkScaledBitmapSampler sampler(cinfo.output_width, cinfo.output_height, + sampleSize); + + bm->setConfig(config, sampler.scaledWidth(), sampler.scaledHeight()); + // jpegs are always opauqe (i.e. have no per-pixel alpha) + bm->setIsOpaque(true); + + if (SkImageDecoder::kDecodeBounds_Mode == mode) { + return true; + } + if (!this->allocPixelRef(bm, NULL)) { + return false; + } + + SkAutoLockPixels alp(*bm); + + if (!sampler.begin(bm, + isRGB ? SkScaledBitmapSampler::kRGB : + SkScaledBitmapSampler::kGray, + this->getDitherImage())) { + return false; + } + + uint8_t* srcRow = (uint8_t*)srcStorage.alloc(cinfo.output_width * 3); + + skip_src_rows(&cinfo, srcRow, sampler.srcY0()); + for (int y = 0;; y++) { + JSAMPLE* rowptr = (JSAMPLE*)srcRow; + int row_count = jpeg_read_scanlines(&cinfo, &rowptr, 1); + SkASSERT(row_count == 1); + + sampler.next(srcRow); + if (bm->height() - 1 == y) { + break; + } + skip_src_rows(&cinfo, srcRow, sampler.srcDY() - 1); + } + + // ??? If I don't do this, I get an error from finish_decompress + skip_src_rows(&cinfo, srcRow, cinfo.output_height - cinfo.output_scanline); + + jpeg_finish_decompress(&cinfo); + + return true; +} + +/////////////////////////////////////////////////////////////////////////////// + +#ifdef SK_SUPPORT_IMAGE_ENCODE + +#include "SkColorPriv.h" + +// taken from jcolor.c in libjpeg +#if 0 // 16bit - precise but slow + #define CYR 19595 // 0.299 + #define CYG 38470 // 0.587 + #define CYB 7471 // 0.114 + + #define CUR -11059 // -0.16874 + #define CUG -21709 // -0.33126 + #define CUB 32768 // 0.5 + + #define CVR 32768 // 0.5 + #define CVG -27439 // -0.41869 + #define CVB -5329 // -0.08131 + + #define CSHIFT 16 +#else // 8bit - fast, slightly less precise + #define CYR 77 // 0.299 + #define CYG 150 // 0.587 + #define CYB 29 // 0.114 + + #define CUR -43 // -0.16874 + #define CUG -85 // -0.33126 + #define CUB 128 // 0.5 + + #define CVR 128 // 0.5 + #define CVG -107 // -0.41869 + #define CVB -21 // -0.08131 + + #define CSHIFT 8 +#endif + +static void rgb2yuv_32(uint8_t dst[], SkPMColor c) { + int r = SkGetPackedR32(c); + int g = SkGetPackedG32(c); + int b = SkGetPackedB32(c); + + int y = ( CYR*r + CYG*g + CYB*b ) >> CSHIFT; + int u = ( CUR*r + CUG*g + CUB*b ) >> CSHIFT; + int v = ( CVR*r + CVG*g + CVB*b ) >> CSHIFT; + + dst[0] = SkToU8(y); + dst[1] = SkToU8(u + 128); + dst[2] = SkToU8(v + 128); +} + +static void rgb2yuv_4444(uint8_t dst[], U16CPU c) { + int r = SkGetPackedR4444(c); + int g = SkGetPackedG4444(c); + int b = SkGetPackedB4444(c); + + int y = ( CYR*r + CYG*g + CYB*b ) >> (CSHIFT - 4); + int u = ( CUR*r + CUG*g + CUB*b ) >> (CSHIFT - 4); + int v = ( CVR*r + CVG*g + CVB*b ) >> (CSHIFT - 4); + + dst[0] = SkToU8(y); + dst[1] = SkToU8(u + 128); + dst[2] = SkToU8(v + 128); +} + +static void rgb2yuv_16(uint8_t dst[], U16CPU c) { + int r = SkGetPackedR16(c); + int g = SkGetPackedG16(c); + int b = SkGetPackedB16(c); + + int y = ( 2*CYR*r + CYG*g + 2*CYB*b ) >> (CSHIFT - 2); + int u = ( 2*CUR*r + CUG*g + 2*CUB*b ) >> (CSHIFT - 2); + int v = ( 2*CVR*r + CVG*g + 2*CVB*b ) >> (CSHIFT - 2); + + dst[0] = SkToU8(y); + dst[1] = SkToU8(u + 128); + dst[2] = SkToU8(v + 128); +} + +/////////////////////////////////////////////////////////////////////////////// + +typedef void (*WriteScanline)(uint8_t* SK_RESTRICT dst, + const void* SK_RESTRICT src, int width, + const SkPMColor* SK_RESTRICT ctable); + +static void Write_32_YUV(uint8_t* SK_RESTRICT dst, + const void* SK_RESTRICT srcRow, int width, + const SkPMColor*) { + const uint32_t* SK_RESTRICT src = (const uint32_t*)srcRow; + while (--width >= 0) { +#ifdef WE_CONVERT_TO_YUV + rgb2yuv_32(dst, *src++); +#else + uint32_t c = *src++; + dst[0] = SkGetPackedR32(c); + dst[1] = SkGetPackedG32(c); + dst[2] = SkGetPackedB32(c); +#endif + dst += 3; + } +} + +static void Write_4444_YUV(uint8_t* SK_RESTRICT dst, + const void* SK_RESTRICT srcRow, int width, + const SkPMColor*) { + const SkPMColor16* SK_RESTRICT src = (const SkPMColor16*)srcRow; + while (--width >= 0) { +#ifdef WE_CONVERT_TO_YUV + rgb2yuv_4444(dst, *src++); +#else + SkPMColor16 c = *src++; + dst[0] = SkPacked4444ToR32(c); + dst[1] = SkPacked4444ToG32(c); + dst[2] = SkPacked4444ToB32(c); +#endif + dst += 3; + } +} + +static void Write_16_YUV(uint8_t* SK_RESTRICT dst, + const void* SK_RESTRICT srcRow, int width, + const SkPMColor*) { + const uint16_t* SK_RESTRICT src = (const uint16_t*)srcRow; + while (--width >= 0) { +#ifdef WE_CONVERT_TO_YUV + rgb2yuv_16(dst, *src++); +#else + uint16_t c = *src++; + dst[0] = SkPacked16ToR32(c); + dst[1] = SkPacked16ToG32(c); + dst[2] = SkPacked16ToB32(c); +#endif + dst += 3; + } +} + +static void Write_Index_YUV(uint8_t* SK_RESTRICT dst, + const void* SK_RESTRICT srcRow, int width, + const SkPMColor* SK_RESTRICT ctable) { + const uint8_t* SK_RESTRICT src = (const uint8_t*)srcRow; + while (--width >= 0) { +#ifdef WE_CONVERT_TO_YUV + rgb2yuv_32(dst, ctable[*src++]); +#else + uint32_t c = ctable[*src++]; + dst[0] = SkGetPackedR32(c); + dst[1] = SkGetPackedG32(c); + dst[2] = SkGetPackedB32(c); +#endif + dst += 3; + } +} + +static WriteScanline ChooseWriter(const SkBitmap& bm) { + switch (bm.config()) { + case SkBitmap::kARGB_8888_Config: + return Write_32_YUV; + case SkBitmap::kRGB_565_Config: + return Write_16_YUV; + case SkBitmap::kARGB_4444_Config: + return Write_4444_YUV; + case SkBitmap::kIndex8_Config: + return Write_Index_YUV; + default: + return NULL; + } +} + +struct sk_destination_mgr : jpeg_destination_mgr { + sk_destination_mgr(SkWStream* stream); + + SkWStream* fStream; + + enum { + kBufferSize = 1024 + }; + uint8_t fBuffer[kBufferSize]; +}; + +static void sk_init_destination(j_compress_ptr cinfo) { + sk_destination_mgr* dest = (sk_destination_mgr*)cinfo->dest; + + dest->next_output_byte = dest->fBuffer; + dest->free_in_buffer = sk_destination_mgr::kBufferSize; +} + +static boolean sk_empty_output_buffer(j_compress_ptr cinfo) { + sk_destination_mgr* dest = (sk_destination_mgr*)cinfo->dest; + +// if (!dest->fStream->write(dest->fBuffer, sk_destination_mgr::kBufferSize - dest->free_in_buffer)) + if (!dest->fStream->write(dest->fBuffer, sk_destination_mgr::kBufferSize)) { + sk_throw(); + } + // ERREXIT(cinfo, JERR_FILE_WRITE); + + dest->next_output_byte = dest->fBuffer; + dest->free_in_buffer = sk_destination_mgr::kBufferSize; + return TRUE; +} + +static void sk_term_destination (j_compress_ptr cinfo) { + sk_destination_mgr* dest = (sk_destination_mgr*)cinfo->dest; + + size_t size = sk_destination_mgr::kBufferSize - dest->free_in_buffer; + if (size > 0) { + if (!dest->fStream->write(dest->fBuffer, size)) { + sk_throw(); + } + } + dest->fStream->flush(); +} + +sk_destination_mgr::sk_destination_mgr(SkWStream* stream) + : fStream(stream) { + this->init_destination = sk_init_destination; + this->empty_output_buffer = sk_empty_output_buffer; + this->term_destination = sk_term_destination; +} + +class SkAutoLockColors : public SkNoncopyable { +public: + SkAutoLockColors(const SkBitmap& bm) { + fCTable = bm.getColorTable(); + fColors = fCTable ? fCTable->lockColors() : NULL; + } + ~SkAutoLockColors() { + if (fCTable) { + fCTable->unlockColors(false); + } + } + const SkPMColor* colors() const { return fColors; } +private: + SkColorTable* fCTable; + const SkPMColor* fColors; +}; + +class SkJPEGImageEncoder : public SkImageEncoder { +protected: + virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) { +#ifdef TIME_ENCODE + AutoTimeMillis atm("JPEG Encode"); +#endif + + const WriteScanline writer = ChooseWriter(bm); + if (NULL == writer) { + return false; + } + + SkAutoLockPixels alp(bm); + if (NULL == bm.getPixels()) { + return false; + } + + jpeg_compress_struct cinfo; + sk_error_mgr sk_err; + sk_destination_mgr sk_wstream(stream); + + cinfo.err = jpeg_std_error(&sk_err); + sk_err.error_exit = sk_error_exit; + if (setjmp(sk_err.fJmpBuf)) { + return false; + } + jpeg_create_compress(&cinfo); + + cinfo.dest = &sk_wstream; + cinfo.image_width = bm.width(); + cinfo.image_height = bm.height(); + cinfo.input_components = 3; +#ifdef WE_CONVERT_TO_YUV + cinfo.in_color_space = JCS_YCbCr; +#else + cinfo.in_color_space = JCS_RGB; +#endif + cinfo.input_gamma = 1; + + jpeg_set_defaults(&cinfo); + jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */); + cinfo.dct_method = JDCT_IFAST; + + jpeg_start_compress(&cinfo, TRUE); + + const int width = bm.width(); + SkAutoMalloc oneRow(width * 3); + uint8_t* oneRowP = (uint8_t*)oneRow.get(); + + SkAutoLockColors alc(bm); + const SkPMColor* colors = alc.colors(); + const void* srcRow = bm.getPixels(); + + while (cinfo.next_scanline < cinfo.image_height) { + JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */ + + writer(oneRowP, srcRow, width, colors); + row_pointer[0] = oneRowP; + (void) jpeg_write_scanlines(&cinfo, row_pointer, 1); + srcRow = (const void*)((const char*)srcRow + bm.rowBytes()); + } + + jpeg_finish_compress(&cinfo); + jpeg_destroy_compress(&cinfo); + + return true; + } +}; + +SkImageEncoder* SkImageEncoder_JPEG_Factory(); +SkImageEncoder* SkImageEncoder_JPEG_Factory() { + return SkNEW(SkJPEGImageEncoder); +} + +#endif /* SK_SUPPORT_IMAGE_ENCODE */ + +////////////////////////////////////////////////////////////////////////// +////////////////////////////////////////////////////////////////////////// + +#ifdef SK_DEBUG + +void SkImageDecoder::UnitTest() { + SkBitmap bm; + + (void)SkImageDecoder::DecodeFile("logo.jpg", &bm); +} + +#endif -- cgit v1.1