// Copyright 2019 Google LLC. // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. #include "include/codec/SkCodec.h" #include "include/core/SkBitmap.h" #include "include/encode/SkPngEncoder.h" #include "src/core/SkOSFile.h" static void update(SkBitmap* maxBitmap, SkBitmap* minBitmap, const SkBitmap& bm) { SkASSERT(!bm.drawsNothing()); SkASSERT(4 == bm.bytesPerPixel()); if (maxBitmap->drawsNothing()) { maxBitmap->allocPixels(bm.info()); maxBitmap->eraseColor(0x00000000); minBitmap->allocPixels(bm.info()); minBitmap->eraseColor(0xFFFFFFFF); } SkASSERT_RELEASE(maxBitmap->info() == bm.info()); const SkPixmap& pmin = minBitmap->pixmap(); const SkPixmap& pmax = maxBitmap->pixmap(); const SkPixmap& pm = bm.pixmap(); for (int y = 0; y < pm.height(); ++y) { for (int x = 0; x < pm.width(); ++x) { uint32_t* minPtr = pmin.writable_addr32(x, y); uint32_t* maxPtr = pmax.writable_addr32(x, y); uint8_t minColor[4], maxColor[4], color[4]; memcpy(minColor, minPtr, 4); memcpy(maxColor, maxPtr, 4); memcpy(color, pm.addr32(x, y), 4); for (unsigned i = 0; i < 4; ++i) { minColor[i] = std::min(minColor[i], color[i]); maxColor[i] = std::max(maxColor[i], color[i]); } memcpy(minPtr, minColor, 4); memcpy(maxPtr, maxColor, 4); } } } static SkBitmap decode_to_srgb_8888_unpremul(const char* path) { SkBitmap dst; if (auto codec = SkCodec::MakeFromData(SkData::MakeFromFileName(path))) { SkISize size = codec->getInfo().dimensions(); SkASSERT(!size.isEmpty()); dst.allocPixels(SkImageInfo::Make( size.width(), size.height(), kRGBA_8888_SkColorType, kUnpremul_SkAlphaType, SkColorSpace::MakeSRGB())); if (SkCodec::kSuccess != codec->getPixels(dst.pixmap())) { dst.reset(); } } return dst; } bool encode_png(const char* path, const SkPixmap& pixmap) { if (!pixmap.addr()) { return false; } SkPngEncoder::Options encOpts; encOpts.fZLibLevel = 9; // slow encode; SkFILEWStream o(path); return o.isValid() && SkPngEncoder::Encode(&o, pixmap, encOpts); } int main(int argc, char** argv) { SkASSERT_RELEASE(argc > 2); const char* src_dir = argv[1]; const char* dst_dir = argv[2]; SkBitmap maxBitmap, minBitmap; SkOSFile::Iter iter(src_dir); SkString name; while (iter.next(&name)) { name.prependf("%s/", src_dir); SkBitmap bm = decode_to_srgb_8888_unpremul(name.c_str()); if (!bm.drawsNothing()) { update(&maxBitmap, &minBitmap, bm); } } SkASSERT_RELEASE(sk_mkdir(dst_dir)); encode_png(SkStringPrintf("%s/min.png", dst_dir).c_str(), minBitmap.pixmap()); encode_png(SkStringPrintf("%s/max.png", dst_dir).c_str(), maxBitmap.pixmap()); }