54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
// Copyright 2020 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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REG_FIDDLE(UnpremulBugs, 400, 400, false, 6) {
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void fill(SkBitmap & b, SkColor c, int n) {
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for (int y = 0; y < n; y++) {
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for (int x = 0; x < n; x++) {
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*(b.getAddr32(x, y)) = c;
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}
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}
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}
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void doCell(SkCanvas* canvas, float x, float y, SkAlphaType at, SkColor c, int n) {
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SkImageInfo info = SkImageInfo::MakeS32(n, n, at);
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SkBitmap bmp;
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bmp.allocPixels(info);
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fill(bmp, c, n);
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sk_sp<SkImage> img = bmp.asImage();
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SkPaint paint;
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const SkTileMode tile = SkTileMode::kRepeat;
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paint.setShader(img->makeShader(tile, tile, SkSamplingOptions()));
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canvas->drawRect(SkRect::MakeXYWH(x, y, 50, 50), paint);
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}
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void draw(SkCanvas* canvas) {
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canvas->clear(SK_ColorBLACK);
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doCell(canvas, 0, 0, kPremul_SkAlphaType, 0x80404040, 2);
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doCell(canvas, 0, 50, kUnpremul_SkAlphaType, 0x80808080, 2);
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doCell(canvas, 50, 0, kPremul_SkAlphaType, 0x80808080, 2);
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doCell(canvas, 50, 50, kUnpremul_SkAlphaType, 0x80FFFFFF, 2);
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doCell(canvas, 110, 0, kPremul_SkAlphaType, 0x80404040, 1);
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doCell(canvas, 110, 50, kUnpremul_SkAlphaType, 0x80808080, 1);
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doCell(canvas, 160, 0, kPremul_SkAlphaType, 0x80808080, 1);
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doCell(canvas, 160, 50, kUnpremul_SkAlphaType, 0x80FFFFFF, 1);
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SkFont font(nullptr, 12);
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SkPaint paint;
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paint.setColor(SK_ColorWHITE);
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canvas->drawString("Premul", 220, 20, font, paint);
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canvas->drawString("Unpremul", 220, 70, font, paint);
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canvas->drawString("Gray", 5, 120, font, paint);
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canvas->drawString("White", 55, 120, font, paint);
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canvas->drawString("Gray", 115, 120, font, paint);
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canvas->drawString("White", 165, 120, font, paint);
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canvas->drawString("2x2", 40, 150, font, paint);
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canvas->drawString("1x1", 150, 150, font, paint);
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}
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} // END FIDDLE
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