1 // Copyright 2019 Google LLC. 2 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. 3 #include "tools/fiddle/examples.h" 4 REG_FIDDLE(Pixmap_readPixels, 256, 128, false, 0) { draw(SkCanvas * canvas)5 void draw(SkCanvas* canvas) { 6 std::vector<int32_t> pixels; 7 const int width = 256; 8 const int height = 64; 9 pixels.resize(height * width * 4); 10 SkImageInfo srcInfo = SkImageInfo::MakeN32Premul(width, height); 11 SkPixmap srcPixmap(srcInfo, (const void*) &pixels.front(), width * 4); 12 SkColor gradColors[] = { 0xFFAA3300, 0x7F881122 }; 13 SkPoint gradPoints[] = { { 0, 0 }, { 256, 0 } }; 14 SkPaint paint; 15 paint.setShader(SkGradientShader::MakeLinear(gradPoints, gradColors, nullptr, 16 std::size(gradColors), SkTileMode::kClamp)); 17 SkBitmap bitmap; 18 bitmap.installPixels(srcPixmap); 19 SkCanvas srcCanvas(bitmap); 20 srcCanvas.drawRect(SkRect::MakeWH(width, height), paint); 21 canvas->drawImage(bitmap.asImage(), 0, 0); 22 std::vector<int32_t> dstPixels; 23 dstPixels.resize(height * width * 2); 24 SkImageInfo dstInfo = srcInfo.makeColorType(kARGB_4444_SkColorType); 25 srcPixmap.readPixels(dstInfo, &dstPixels.front(), width * 2); 26 SkPixmap dstPixmap(dstInfo, &dstPixels.front(), width * 2); 27 bitmap.installPixels(dstPixmap); 28 canvas->drawImage(bitmap.asImage(), 0, 128); 29 } 30 } // END FIDDLE 31