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/*
* Copyright 2007 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkImageEncoderPriv.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkDither.h"
#include "SkJPEGWriteUtility.h"
#include "SkRect.h"
#include "SkStream.h"
#include "SkTemplates.h"
#include "SkTime.h"
#include "SkUtils.h"
#include <stdio.h>
extern "C" {
#include "jpeglib.h"
#include "jerror.h"
}
// These enable timing code that report milliseconds for an encoding
//#define TIME_ENCODE
typedef void (*WriteScanline)(uint8_t* SK_RESTRICT dst,
const void* SK_RESTRICT src, int width,
const SkPMColor* SK_RESTRICT ctable);
static void Write_32_RGB(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) {
uint32_t c = *src++;
dst[0] = SkGetPackedR32(c);
dst[1] = SkGetPackedG32(c);
dst[2] = SkGetPackedB32(c);
dst += 3;
}
}
static void Write_4444_RGB(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) {
SkPMColor16 c = *src++;
dst[0] = SkPacked4444ToR32(c);
dst[1] = SkPacked4444ToG32(c);
dst[2] = SkPacked4444ToB32(c);
dst += 3;
}
}
static void Write_16_RGB(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) {
uint16_t c = *src++;
dst[0] = SkPacked16ToR32(c);
dst[1] = SkPacked16ToG32(c);
dst[2] = SkPacked16ToB32(c);
dst += 3;
}
}
static void Write_Index_RGB(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) {
uint32_t c = ctable[*src++];
dst[0] = SkGetPackedR32(c);
dst[1] = SkGetPackedG32(c);
dst[2] = SkGetPackedB32(c);
dst += 3;
}
}
static WriteScanline ChooseWriter(const SkBitmap& bm) {
switch (bm.colorType()) {
case kN32_SkColorType:
return Write_32_RGB;
case kRGB_565_SkColorType:
return Write_16_RGB;
case kARGB_4444_SkColorType:
return Write_4444_RGB;
case kIndex_8_SkColorType:
return Write_Index_RGB;
default:
return nullptr;
}
}
class SkJPEGImageEncoder : public SkImageEncoder {
protected:
virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) {
#ifdef TIME_ENCODE
SkAutoTime atm("JPEG Encode");
#endif
SkAutoLockPixels alp(bm);
if (nullptr == bm.getPixels()) {
return false;
}
jpeg_compress_struct cinfo;
skjpeg_error_mgr sk_err;
skjpeg_destination_mgr sk_wstream(stream);
// allocate these before set call setjmp
SkAutoTMalloc<uint8_t> oneRow;
cinfo.err = jpeg_std_error(&sk_err);
sk_err.error_exit = skjpeg_error_exit;
if (setjmp(sk_err.fJmpBuf)) {
return false;
}
// Keep after setjmp or mark volatile.
const WriteScanline writer = ChooseWriter(bm);
if (nullptr == writer) {
return false;
}
jpeg_create_compress(&cinfo);
cinfo.dest = &sk_wstream;
cinfo.image_width = bm.width();
cinfo.image_height = bm.height();
cinfo.input_components = 3;
// FIXME: Can we take advantage of other in_color_spaces in libjpeg-turbo?
cinfo.in_color_space = JCS_RGB;
// The gamma value is ignored by libjpeg-turbo.
cinfo.input_gamma = 1;
jpeg_set_defaults(&cinfo);
// Tells libjpeg-turbo to compute optimal Huffman coding tables
// for the image. This improves compression at the cost of
// slower encode performance.
cinfo.optimize_coding = TRUE;
jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
jpeg_start_compress(&cinfo, TRUE);
const int width = bm.width();
uint8_t* oneRowP = oneRow.reset(width * 3);
const SkPMColor* colors = bm.getColorTable() ? bm.getColorTable()->readColors() : nullptr;
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;
}
};
///////////////////////////////////////////////////////////////////////////////
DEFINE_ENCODER_CREATOR(JPEGImageEncoder);
///////////////////////////////////////////////////////////////////////////////
static SkImageEncoder* sk_libjpeg_efactory(SkImageEncoder::Type t) {
return (SkEncodedImageFormat::kJPEG == (SkEncodedImageFormat)t) ? new SkJPEGImageEncoder : nullptr;
}
static SkImageEncoder_EncodeReg gEReg(sk_libjpeg_efactory);
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