41 lines
1.3 KiB
C++
41 lines
1.3 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=a7ac9c21bbabcdeeca00f72a61cd0f3e
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REG_FIDDLE(Canvas_accessTopLayerPixels_b, 256, 256, false, 0) {
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void draw(SkCanvas* canvas) {
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SkPaint paint;
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SkFont font(nullptr, 100);
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canvas->drawString("ABC", 20, 160, font, paint);
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SkRect layerBounds = SkRect::MakeXYWH(32, 32, 192, 192);
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canvas->saveLayerAlpha(&layerBounds, 128);
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canvas->clear(SK_ColorWHITE);
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canvas->drawString("DEF", 20, 160, font, paint);
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SkImageInfo imageInfo;
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size_t rowBytes;
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SkIPoint origin;
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uint32_t* access = (uint32_t*) canvas->accessTopLayerPixels(&imageInfo, &rowBytes, &origin);
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if (access) {
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int h = imageInfo.height();
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int v = imageInfo.width();
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int rowWords = rowBytes / sizeof(uint32_t);
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for (int y = 0; y < h; ++y) {
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int newY = (y - h / 2) * 2 + h / 2;
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if (newY < 0 || newY >= h) {
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continue;
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}
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for (int x = 0; x < v; ++x) {
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int newX = (x - v / 2) * 2 + v / 2;
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if (newX < 0 || newX >= v) {
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continue;
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}
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if (access[y * rowWords + x] == SK_ColorBLACK) {
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access[newY * rowWords + newX] = SK_ColorGRAY;
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}
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}
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}
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}
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canvas->restore();
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}
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} // END FIDDLE
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