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Unified Diff: skia/images/SkImageDecoder_libjpeg.cpp

Issue 113827: Remove the remainder of the skia source code from the Chromium repo.... (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 11 years, 7 months ago
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Index: skia/images/SkImageDecoder_libjpeg.cpp
===================================================================
--- skia/images/SkImageDecoder_libjpeg.cpp (revision 16859)
+++ skia/images/SkImageDecoder_libjpeg.cpp (working copy)
@@ -1,811 +0,0 @@
-/*
- * Copyright 2007, The Android Open Source Project
- *
- * 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 <stdio.h>
-extern "C" {
- #include "jpeglib.h"
- #include "jerror.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) {
- static const char gHeader[] = { 0xFF, 0xD8, 0xFF };
- static const size_t HEADER_SIZE = sizeof(gHeader);
-
- char buffer[HEADER_SIZE];
- size_t len = stream->read(buffer, HEADER_SIZE);
-
- if (len != HEADER_SIZE) {
- return NULL; // can't read enough
- }
-
- if (memcmp(buffer, gHeader, HEADER_SIZE)) {
- return NULL;
- }
-
- 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, SkImageDecoder* decoder);
-
- SkStream* fStream;
- const void* fMemoryBase;
- size_t fMemoryBaseSize;
- SkImageDecoder* fDecoder;
- 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;
- if (src->fDecoder != NULL && src->fDecoder->shouldCancelDecode()) {
- return FALSE;
- }
- 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) {
- 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 bytesToSkip = num_bytes - src->bytes_in_buffer;
-
- // check if the skip amount exceeds the current buffer
- if (bytesToSkip > 0) {
- size_t bytes = src->fStream->skip(bytesToSkip);
- if (bytes != (size_t)bytesToSkip) {
-// SkDebugf("xxxxxxxxxxxxxx failure to skip request %d actual %d\n", bytesToSkip, bytes);
- 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()) {
- SkDebugf("xxxxxxxxxxxxxx failure to rewind\n");
- cinfo->err->error_exit((j_common_ptr)cinfo);
- return FALSE;
- }
- src->next_input_byte = (const JOCTET*)src->fBuffer;
- src->bytes_in_buffer = 0;
- return TRUE;
-}
-
-static void sk_term_source(j_decompress_ptr /*cinfo*/) {}
-
-///////////////////////////////////////////////////////////////////////////////
-
-static void skmem_init_source(j_decompress_ptr cinfo) {
- sk_source_mgr* src = (sk_source_mgr*)cinfo->src;
- src->next_input_byte = (const JOCTET*)src->fMemoryBase;
- src->bytes_in_buffer = src->fMemoryBaseSize;
-}
-
-static boolean skmem_fill_input_buffer(j_decompress_ptr cinfo) {
- SkDebugf("xxxxxxxxxxxxxx skmem_fill_input_buffer called\n");
- return FALSE;
-}
-
-static void skmem_skip_input_data(j_decompress_ptr cinfo, long num_bytes) {
- sk_source_mgr* src = (sk_source_mgr*)cinfo->src;
-// SkDebugf("xxxxxxxxxxxxxx skmem_skip_input_data called %d\n", num_bytes);
- src->next_input_byte = (const JOCTET*)((const char*)src->next_input_byte + num_bytes);
- src->bytes_in_buffer -= num_bytes;
-}
-
-static boolean skmem_resync_to_restart(j_decompress_ptr cinfo, int desired) {
- SkDebugf("xxxxxxxxxxxxxx skmem_resync_to_restart called\n");
- return TRUE;
-}
-
-static void skmem_term_source(j_decompress_ptr /*cinfo*/) {}
-
-///////////////////////////////////////////////////////////////////////////////
-
-sk_source_mgr::sk_source_mgr(SkStream* stream, SkImageDecoder* decoder) : fStream(stream) {
- fDecoder = decoder;
- const void* baseAddr = stream->getMemoryBase();
- if (baseAddr && false) {
- fMemoryBase = baseAddr;
- fMemoryBaseSize = stream->getLength();
-
- init_source = skmem_init_source;
- fill_input_buffer = skmem_fill_input_buffer;
- skip_input_data = skmem_skip_input_data;
- resync_to_restart = skmem_resync_to_restart;
- term_source = skmem_term_source;
- } else {
- fMemoryBase = NULL;
- fMemoryBaseSize = 0;
-
- 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;
- }
-// SkDebugf("**************** use memorybase %p %d\n", fMemoryBase, fMemoryBaseSize);
-}
-
-#include <setjmp.h>
-
-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 bool 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);
- if (row_count != 1) {
- return false;
- }
- }
- return true;
-}
-
-// This guy exists just to aid in debugging, as it allows debuggers to just
-// set a break-point in one place to see all error exists.
-static bool return_false(const jpeg_decompress_struct& cinfo,
- const SkBitmap& bm, const char msg[]) {
-#if 0
- SkDebugf("libjpeg error %d <%s> from %s [%d %d]", cinfo.err->msg_code,
- cinfo.err->jpeg_message_table[cinfo.err->msg_code], msg,
- bm.width(), bm.height());
-#endif
- return false; // must always return false
-}
-
-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, this);
-
- 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 return_false(cinfo, *bm, "setjmp");
- }
-
- jpeg_create_decompress(&cinfo);
- autoClean.set(&cinfo);
-
- //jpeg_stdio_src(&cinfo, file);
- cinfo.src = &sk_stream;
-
- int status = jpeg_read_header(&cinfo, true);
- if (status != JPEG_HEADER_OK) {
- return return_false(cinfo, *bm, "read_header");
- }
-
- /* 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;
-
- /* this gives about 30% performance improvement. In theory it may
- reduce the visual quality, in practice I'm not seeing a difference
- */
- cinfo.do_fancy_upsampling = 0;
-
- /* this gives another few percents */
- cinfo.do_block_smoothing = 0;
-
- /* default format is RGB */
- cinfo.out_color_space = JCS_RGB;
-
- 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;
- }
-
-#ifdef ANDROID_RGB
- cinfo.dither_mode = JDITHER_NONE;
- if (config == SkBitmap::kARGB_8888_Config) {
- cinfo.out_color_space = JCS_RGBA_8888;
- } else if (config == SkBitmap::kRGB_565_Config) {
- if (sampleSize == 1) {
- // SkScaledBitmapSampler can't handle RGB_565 yet,
- // so don't even try.
- cinfo.out_color_space = JCS_RGB_565;
- if (this->getDitherImage()) {
- cinfo.dither_mode = JDITHER_ORDERED;
- }
- }
- }
-#endif
-
- /* 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.
- */
- if (!jpeg_start_decompress(&cinfo)) {
- return return_false(cinfo, *bm, "start_decompress");
- }
-
- /* 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;
-
-
- // should we allow the Chooser (if present) to pick a config for us???
- if (!this->chooseFromOneChoice(config, cinfo.output_width,
- cinfo.output_height)) {
- return return_false(cinfo, *bm, "chooseFromOneChoice");
- }
-
-#ifdef ANDROID_RGB
- /* short-circuit the SkScaledBitmapSampler when possible, as this gives
- a significant performance boost.
- */
- if (sampleSize == 1 &&
- ((config == SkBitmap::kARGB_8888_Config &&
- cinfo.out_color_space == JCS_RGBA_8888) ||
- (config == SkBitmap::kRGB_565_Config &&
- cinfo.out_color_space == JCS_RGB_565)))
- {
- bm->setConfig(config, cinfo.output_width, cinfo.output_height);
- bm->setIsOpaque(true);
- if (SkImageDecoder::kDecodeBounds_Mode == mode) {
- return true;
- }
- if (!this->allocPixelRef(bm, NULL)) {
- return return_false(cinfo, *bm, "allocPixelRef");
- }
- SkAutoLockPixels alp(*bm);
- JSAMPLE* rowptr = (JSAMPLE*)bm->getPixels();
- INT32 const bpr = bm->rowBytes();
-
- while (cinfo.output_scanline < cinfo.output_height) {
- int row_count = jpeg_read_scanlines(&cinfo, &rowptr, 1);
- // if row_count == 0, then we didn't get a scanline, so abort.
- // if we supported partial images, we might return true in this case
- if (0 == row_count) {
- return return_false(cinfo, *bm, "read_scanlines");
- }
- if (this->shouldCancelDecode()) {
- return return_false(cinfo, *bm, "shouldCancelDecode");
- }
- rowptr += bpr;
- }
- jpeg_finish_decompress(&cinfo);
- return true;
- }
-#endif
-
- // check for supported formats
- SkScaledBitmapSampler::SrcConfig sc;
- if (3 == cinfo.out_color_components && JCS_RGB == cinfo.out_color_space) {
- sc = SkScaledBitmapSampler::kRGB;
-#ifdef ANDROID_RGB
- } else if (JCS_RGBA_8888 == cinfo.out_color_space) {
- sc = SkScaledBitmapSampler::kRGBX;
- //} else if (JCS_RGB_565 == cinfo.out_color_space) {
- // sc = SkScaledBitmapSampler::kRGB_565;
-#endif
- } else if (1 == cinfo.out_color_components &&
- JCS_GRAYSCALE == cinfo.out_color_space) {
- sc = SkScaledBitmapSampler::kGray;
- } else {
- return return_false(cinfo, *bm, "jpeg colorspace");
- }
-
- 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 return_false(cinfo, *bm, "allocPixelRef");
- }
-
- SkAutoLockPixels alp(*bm);
- if (!sampler.begin(bm, sc, this->getDitherImage())) {
- return return_false(cinfo, *bm, "sampler.begin");
- }
-
- uint8_t* srcRow = (uint8_t*)srcStorage.alloc(cinfo.output_width * 4);
-
- // Possibly skip initial rows [sampler.srcY0]
- if (!skip_src_rows(&cinfo, srcRow, sampler.srcY0())) {
- return return_false(cinfo, *bm, "skip rows");
- }
-
- // now loop through scanlines until y == bm->height() - 1
- for (int y = 0;; y++) {
- JSAMPLE* rowptr = (JSAMPLE*)srcRow;
- int row_count = jpeg_read_scanlines(&cinfo, &rowptr, 1);
- if (0 == row_count) {
- return return_false(cinfo, *bm, "read_scanlines");
- }
- if (this->shouldCancelDecode()) {
- return return_false(cinfo, *bm, "shouldCancelDecode");
- }
-
- sampler.next(srcRow);
- if (bm->height() - 1 == y) {
- // we're done
- break;
- }
-
- if (!skip_src_rows(&cinfo, srcRow, sampler.srcDY() - 1)) {
- return return_false(cinfo, *bm, "skip rows");
- }
- }
-
- // we formally skip the rest, so we don't get a complaint from libjpeg
- if (!skip_src_rows(&cinfo, srcRow,
- cinfo.output_height - cinfo.output_scanline)) {
- return return_false(cinfo, *bm, "skip rows");
- }
- jpeg_finish_decompress(&cinfo);
-
-// SkDebugf("------------------- bm2 size %d [%d %d] %d\n", bm->getSize(), bm->width(), bm->height(), bm->config());
- 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)) {
- ERREXIT(cinfo, JERR_FILE_WRITE);
- return false;
- }
-
- 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)) {
- ERREXIT(cinfo, JERR_FILE_WRITE);
- return;
- }
- }
- 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 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);
-
- // allocate these before set call setjmp
- SkAutoMalloc oneRow;
- SkAutoLockColors ctLocker;
-
- 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();
- uint8_t* oneRowP = (uint8_t*)oneRow.alloc(width * 3);
-
- const SkPMColor* colors = ctLocker.lockColors(bm);
- 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
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