15c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* 25c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Copyright (c) 2010, Google Inc. All rights reserved. 35c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 45c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Redistribution and use in source and binary forms, with or without 55c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * modification, are permitted provided that the following conditions are 65c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * met: 75c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 85c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * * Redistributions of source code must retain the above copyright 95c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * notice, this list of conditions and the following disclaimer. 105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * * Redistributions in binary form must reproduce the above 115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * copyright notice, this list of conditions and the following disclaimer 125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * in the documentation and/or other materials provided with the 135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * distribution. 145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * * Neither the name of Google Inc. nor the names of its 155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * contributors may be used to endorse or promote products derived from 165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * this software without specific prior written permission. 175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 295c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) */ 305c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#include "config.h" 32a854de003a23bf3c7f95ec0f8154ada64092ff5cTorne (Richard Coles)#include "platform/image-encoders/skia/PNGImageEncoder.h" 335c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 345c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#include "SkBitmap.h" 355c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#include "SkColorPriv.h" 365c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#include "SkUnPreMultiply.h" 371e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)#include "platform/geometry/IntSize.h" 38a854de003a23bf3c7f95ec0f8154ada64092ff5cTorne (Richard Coles)#include "platform/graphics/ImageBuffer.h" 395c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)extern "C" { 405c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#include "png.h" 415c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 43c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)namespace blink { 445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)static void writeOutput(png_structp png, png_bytep data, png_size_t size) 465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static_cast<Vector<unsigned char>*>(png_get_io_ptr(png))->append(data, size); 485c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)static void preMultipliedBGRAtoRGBA(const void* pixels, int pixelCount, unsigned char* output) 515c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 525c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) static const SkUnPreMultiply::Scale* scale = SkUnPreMultiply::GetScaleTable(); 535c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const SkPMColor* input = static_cast<const SkPMColor*>(pixels); 545c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 555c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) for (; pixelCount-- > 0; ++input) { 565c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const unsigned alpha = SkGetPackedA32(*input); 575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if ((alpha != 0) && (alpha != 255)) { 585c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *output++ = SkUnPreMultiply::ApplyScale(scale[alpha], SkGetPackedR32(*input)); 595c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *output++ = SkUnPreMultiply::ApplyScale(scale[alpha], SkGetPackedG32(*input)); 605c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *output++ = SkUnPreMultiply::ApplyScale(scale[alpha], SkGetPackedB32(*input)); 615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *output++ = alpha; 625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } else { 635c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *output++ = SkGetPackedR32(*input); 645c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *output++ = SkGetPackedG32(*input); 655c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *output++ = SkGetPackedB32(*input); 665c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) *output++ = alpha; 675c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 685c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 695c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 705c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 715c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)static bool encodePixels(IntSize imageSize, unsigned char* inputPixels, bool premultiplied, Vector<unsigned char>* output) 725c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 735c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) imageSize.clampNegativeToZero(); 745c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Vector<unsigned char> row; 755c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 765c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_struct* png = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0); 775c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_info* info = png_create_info_struct(png); 785c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (!png || !info || setjmp(png_jmpbuf(png))) { 795c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_destroy_write_struct(png ? &png : 0, info ? &info : 0); 805c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return false; 815c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 825c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 835c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Optimize compression for speed. 845c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // The parameters are the same as what libpng uses by default for RGB and RGBA images, except: 855c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // - the zlib compression level is 3 instead of 6, to avoid the lazy Ziv-Lempel match searching; 865c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // - the delta filter is 1 ("sub") instead of 5 ("all"), to reduce the filter computations. 875c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // The zlib memory level (8) and strategy (Z_FILTERED) will be set inside libpng. 885c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // 895c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Avoid the zlib strategies Z_HUFFMAN_ONLY or Z_RLE. 905c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Although they are the fastest for poorly-compressible images (e.g. photographs), 915c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // they are very slow for highly-compressible images (e.g. text, drawings or business graphics). 925c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_set_compression_level(png, 3); 935c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_set_filter(png, PNG_FILTER_TYPE_BASE, PNG_FILTER_SUB); 945c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 955c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_set_write_fn(png, output, writeOutput, 0); 965c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_set_IHDR(png, info, imageSize.width(), imageSize.height(), 975c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 8, PNG_COLOR_TYPE_RGB_ALPHA, 0, 0, 0); 985c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_write_info(png, info); 995c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1005c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) unsigned char* pixels = inputPixels; 1015c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) row.resize(imageSize.width() * sizeof(SkPMColor)); 1025c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) const size_t pixelRowStride = imageSize.width() * 4; 1035c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) for (int y = 0; y < imageSize.height(); ++y) { 1045c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (premultiplied) { 1055c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) preMultipliedBGRAtoRGBA(pixels, imageSize.width(), row.data()); 1065c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_write_row(png, row.data()); 1075c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } else 1085c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_write_row(png, pixels); 1095c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) pixels += pixelRowStride; 1105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 1115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_write_end(png, info); 1135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) png_destroy_write_struct(&png, &info); 1145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return true; 1155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 1165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)bool PNGImageEncoder::encode(const SkBitmap& bitmap, Vector<unsigned char>* output) 1185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 1195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) SkAutoLockPixels bitmapLock(bitmap); 1205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 121197021e6b966cfb06891637935ef33fff06433d1Ben Murdoch if (bitmap.colorType() != kN32_SkColorType || !bitmap.getPixels()) 1225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return false; // Only support 32 bit/pixel skia bitmaps. 1235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 1245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return encodePixels(IntSize(bitmap.width(), bitmap.height()), static_cast<unsigned char*>(bitmap.getPixels()), true, output); 1255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 1265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 12751b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles)bool PNGImageEncoder::encode(const ImageDataBuffer& imageData, Vector<unsigned char>* output) 1285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 12951b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles) return encodePixels(imageData.size(), imageData.data(), false, output); 1305c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 1315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 132c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)} // namespace blink 133