29 lines
1.2 KiB
C++
29 lines
1.2 KiB
C++
// Copyright 2019 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#include "tools/fiddle/examples.h"
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// HASH=b2cbbbbcffb618865d8aae3bc04b2a62
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REG_FIDDLE(Bitmap_readPixels, 256, 128, false, 0) {
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void draw(SkCanvas* canvas) {
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const int width = 256;
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const int height = 64;
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SkImageInfo srcInfo = SkImageInfo::MakeN32Premul(width, height);
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SkColor gradColors[] = { 0xFFAA3300, 0x7F881122 };
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SkPoint gradPoints[] = { { 0, 0 }, { 256, 0 } };
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SkPaint paint;
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paint.setShader(SkGradientShader::MakeLinear(gradPoints, gradColors, nullptr,
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SK_ARRAY_COUNT(gradColors), SkTileMode::kClamp));
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SkBitmap bitmap;
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bitmap.allocPixels(srcInfo);
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SkCanvas srcCanvas(bitmap);
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srcCanvas.drawRect(SkRect::MakeWH(width, height), paint);
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canvas->drawImage(bitmap.asImage(), 0, 0);
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SkImageInfo dstInfo = srcInfo.makeColorType(kARGB_4444_SkColorType);
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std::vector<int16_t> dstPixels;
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dstPixels.resize(height * width);
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bitmap.readPixels(dstInfo, &dstPixels.front(), width * 2, 0, 0);
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SkPixmap dstPixmap(dstInfo, &dstPixels.front(), width * 2);
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bitmap.installPixels(dstPixmap);
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canvas->drawImage(bitmap.asImage(), 0, 64);
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}
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} // END FIDDLE
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