| /* |
| * 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 "SkColorPriv.h" |
| #include "SkColorSpace_Base.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; } |
| |
| jmp_buf& jmpBuf() { return fErrMgr.fJmpBuf; } |
| |
| 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; |
| } |
| |
| // Note that kRespect mode is only supported with sRGB or linear transfer functions. |
| // The legacy code path is incidentally correct when the transfer function is linear. |
| const bool isSRGBTransferFn = srcInfo.gammaCloseToSRGB() && |
| (SkTransferFunctionBehavior::kRespect == options.fBlendBehavior); |
| if (isSRGBTransferFn) { |
| return transform_scanline_to_premul_linear; |
| } else { |
| 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() || !srcInfo.colorSpace()->gammaIsLinear() || |
| SkTransferFunctionBehavior::kRespect != options.fBlendBehavior) { |
| 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, options.fBlendBehavior)) { |
| return nullptr; |
| } |
| |
| std::unique_ptr<SkJpegEncoderMgr> encoderMgr = SkJpegEncoderMgr::Make(dst); |
| if (setjmp(encoderMgr->jmpBuf())) { |
| 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) { |
| if (setjmp(fEncoderMgr->jmpBuf())) { |
| 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 |