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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"
#ifdef SK_HAS_JPEG_LIBRARY
#include "SkColorData.h"
#include "SkImageEncoderFns.h"
#include "SkImageInfoPriv.h"
#include "SkJpegEncoder.h"
#include "SkJPEGWriteUtility.h"
#include "SkStream.h"
#include "SkTemplates.h"
#include <stdio.h>
extern "C" {
#include "jpeglib.h"
#include "jerror.h"
}
class SkJpegEncoderMgr final : SkNoncopyable {
public:
/*
* Create the decode manager
* Does not take ownership of stream
*/
static std::unique_ptr<SkJpegEncoderMgr> Make(SkWStream* stream) {
return std::unique_ptr<SkJpegEncoderMgr>(new SkJpegEncoderMgr(stream));
}
bool setParams(const SkImageInfo& srcInfo, const SkJpegEncoder::Options& options);
jpeg_compress_struct* cinfo() { return &fCInfo; }
skjpeg_error_mgr* errorMgr() { return &fErrMgr; }
transform_scanline_proc proc() const { return fProc; }
~SkJpegEncoderMgr() {
jpeg_destroy_compress(&fCInfo);
}
private:
SkJpegEncoderMgr(SkWStream* stream)
: fDstMgr(stream)
, fProc(nullptr)
{
fCInfo.err = jpeg_std_error(&fErrMgr);
fErrMgr.error_exit = skjpeg_error_exit;
jpeg_create_compress(&fCInfo);
fCInfo.dest = &fDstMgr;
}
jpeg_compress_struct fCInfo;
skjpeg_error_mgr fErrMgr;
skjpeg_destination_mgr fDstMgr;
transform_scanline_proc fProc;
};
bool SkJpegEncoderMgr::setParams(const SkImageInfo& srcInfo, const SkJpegEncoder::Options& options)
{
auto chooseProc8888 = [&]() {
if (kUnpremul_SkAlphaType != srcInfo.alphaType() ||
SkJpegEncoder::AlphaOption::kIgnore == options.fAlphaOption)
{
return (transform_scanline_proc) nullptr;
}
return transform_scanline_to_premul_legacy;
};
J_COLOR_SPACE jpegColorType = JCS_EXT_RGBA;
int numComponents = 0;
switch (srcInfo.colorType()) {
case kRGBA_8888_SkColorType:
fProc = chooseProc8888();
jpegColorType = JCS_EXT_RGBA;
numComponents = 4;
break;
case kBGRA_8888_SkColorType:
fProc = chooseProc8888();
jpegColorType = JCS_EXT_BGRA;
numComponents = 4;
break;
case kRGB_565_SkColorType:
fProc = transform_scanline_565;
jpegColorType = JCS_RGB;
numComponents = 3;
break;
case kARGB_4444_SkColorType:
if (SkJpegEncoder::AlphaOption::kBlendOnBlack == options.fAlphaOption) {
return false;
}
fProc = transform_scanline_444;
jpegColorType = JCS_RGB;
numComponents = 3;
break;
case kGray_8_SkColorType:
SkASSERT(srcInfo.isOpaque());
jpegColorType = JCS_GRAYSCALE;
numComponents = 1;
break;
case kRGBA_F16_SkColorType:
if (!srcInfo.colorSpace()) {
return false;
}
if (kUnpremul_SkAlphaType != srcInfo.alphaType() ||
SkJpegEncoder::AlphaOption::kIgnore == options.fAlphaOption)
{
fProc = transform_scanline_F16_to_8888;
} else {
fProc = transform_scanline_F16_to_premul_8888;
}
jpegColorType = JCS_EXT_RGBA;
numComponents = 4;
break;
default:
return false;
}
fCInfo.image_width = srcInfo.width();
fCInfo.image_height = srcInfo.height();
fCInfo.in_color_space = jpegColorType;
fCInfo.input_components = numComponents;
jpeg_set_defaults(&fCInfo);
if (kGray_8_SkColorType != srcInfo.colorType()) {
switch (options.fDownsample) {
case SkJpegEncoder::Downsample::k420:
SkASSERT(2 == fCInfo.comp_info[0].h_samp_factor);
SkASSERT(2 == fCInfo.comp_info[0].v_samp_factor);
SkASSERT(1 == fCInfo.comp_info[1].h_samp_factor);
SkASSERT(1 == fCInfo.comp_info[1].v_samp_factor);
SkASSERT(1 == fCInfo.comp_info[2].h_samp_factor);
SkASSERT(1 == fCInfo.comp_info[2].v_samp_factor);
break;
case SkJpegEncoder::Downsample::k422:
fCInfo.comp_info[0].h_samp_factor = 2;
fCInfo.comp_info[0].v_samp_factor = 1;
fCInfo.comp_info[1].h_samp_factor = 1;
fCInfo.comp_info[1].v_samp_factor = 1;
fCInfo.comp_info[2].h_samp_factor = 1;
fCInfo.comp_info[2].v_samp_factor = 1;
break;
case SkJpegEncoder::Downsample::k444:
fCInfo.comp_info[0].h_samp_factor = 1;
fCInfo.comp_info[0].v_samp_factor = 1;
fCInfo.comp_info[1].h_samp_factor = 1;
fCInfo.comp_info[1].v_samp_factor = 1;
fCInfo.comp_info[2].h_samp_factor = 1;
fCInfo.comp_info[2].v_samp_factor = 1;
break;
}
}
// Tells libjpeg-turbo to compute optimal Huffman coding tables
// for the image. This improves compression at the cost of
// slower encode performance.
fCInfo.optimize_coding = TRUE;
return true;
}
std::unique_ptr<SkEncoder> SkJpegEncoder::Make(SkWStream* dst, const SkPixmap& src,
const Options& options) {
if (!SkPixmapIsValid(src)) {
return nullptr;
}
std::unique_ptr<SkJpegEncoderMgr> encoderMgr = SkJpegEncoderMgr::Make(dst);
skjpeg_error_mgr::AutoPushJmpBuf jmp(encoderMgr->errorMgr());
if (setjmp(jmp)) {
return nullptr;
}
if (!encoderMgr->setParams(src.info(), options)) {
return nullptr;
}
jpeg_set_quality(encoderMgr->cinfo(), options.fQuality, TRUE);
jpeg_start_compress(encoderMgr->cinfo(), TRUE);
sk_sp<SkData> icc = icc_from_color_space(src.info());
if (icc) {
// Create a contiguous block of memory with the icc signature followed by the profile.
sk_sp<SkData> markerData =
SkData::MakeUninitialized(kICCMarkerHeaderSize + icc->size());
uint8_t* ptr = (uint8_t*) markerData->writable_data();
memcpy(ptr, kICCSig, sizeof(kICCSig));
ptr += sizeof(kICCSig);
*ptr++ = 1; // This is the first marker.
*ptr++ = 1; // Out of one total markers.
memcpy(ptr, icc->data(), icc->size());
jpeg_write_marker(encoderMgr->cinfo(), kICCMarker, markerData->bytes(), markerData->size());
}
return std::unique_ptr<SkJpegEncoder>(new SkJpegEncoder(std::move(encoderMgr), src));
}
SkJpegEncoder::SkJpegEncoder(std::unique_ptr<SkJpegEncoderMgr> encoderMgr, const SkPixmap& src)
: INHERITED(src, encoderMgr->proc() ? encoderMgr->cinfo()->input_components*src.width() : 0)
, fEncoderMgr(std::move(encoderMgr))
{}
SkJpegEncoder::~SkJpegEncoder() {}
bool SkJpegEncoder::onEncodeRows(int numRows) {
skjpeg_error_mgr::AutoPushJmpBuf jmp(fEncoderMgr->errorMgr());
if (setjmp(jmp)) {
return false;
}
const void* srcRow = fSrc.addr(0, fCurrRow);
for (int i = 0; i < numRows; i++) {
JSAMPLE* jpegSrcRow = (JSAMPLE*) srcRow;
if (fEncoderMgr->proc()) {
fEncoderMgr->proc()((char*)fStorage.get(), (const char*)srcRow, fSrc.width(),
fEncoderMgr->cinfo()->input_components, nullptr);
jpegSrcRow = fStorage.get();
}
jpeg_write_scanlines(fEncoderMgr->cinfo(), &jpegSrcRow, 1);
srcRow = SkTAddOffset<const void>(srcRow, fSrc.rowBytes());
}
fCurrRow += numRows;
if (fCurrRow == fSrc.height()) {
jpeg_finish_compress(fEncoderMgr->cinfo());
}
return true;
}
bool SkJpegEncoder::Encode(SkWStream* dst, const SkPixmap& src, const Options& options) {
auto encoder = SkJpegEncoder::Make(dst, src, options);
return encoder.get() && encoder->encodeRows(src.height());
}
#endif
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