120 lines
3.6 KiB
C++
120 lines
3.6 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkBitmap.h"
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#include "include/core/SkBlendMode.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkColorPriv.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkImageInfo.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkString.h"
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#include "include/core/SkTypes.h"
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/**
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* This GM checks that bitmap pixels are unpremultiplied before being exported
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* to other formats. If unpremultiplication is implemented properly, this
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* GM should come out completely white. If not, this GM looks like a row of two
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* greyscale gradients above a row of grey lines.
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* This tests both the ARGB4444 and ARGB8888 bitmap configurations.
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*/
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constexpr int SLIDE_SIZE = 256;
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static void init_bitmap(SkColorType ct, SkBitmap* bitmap) {
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bitmap->allocPixels(SkImageInfo::Make(SLIDE_SIZE, SLIDE_SIZE, ct,
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kPremul_SkAlphaType));
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bitmap->eraseColor(SK_ColorWHITE);
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}
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static sk_sp<SkImage> make_argb8888_gradient() {
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SkBitmap bitmap;
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init_bitmap(kN32_SkColorType, &bitmap);
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for (int y = 0; y < SLIDE_SIZE; y++) {
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uint32_t* dst = bitmap.getAddr32(0, y);
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for (int x = 0; x < SLIDE_SIZE; x++) {
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dst[x] = SkPackARGB32(y, y, y, y);
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}
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}
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return bitmap.asImage();
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}
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static sk_sp<SkImage> make_argb4444_gradient() {
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SkBitmap bitmap;
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init_bitmap(kARGB_4444_SkColorType, &bitmap);
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// Using draw rather than readPixels to suppress dither
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SkPaint paint;
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paint.setBlendMode(SkBlendMode::kSrc);
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SkCanvas{ bitmap }.drawImage(make_argb8888_gradient(), 0, 0, SkSamplingOptions(), &paint);
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return bitmap.asImage();
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}
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static sk_sp<SkImage> make_argb8888_stripes() {
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SkBitmap bitmap;
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init_bitmap(kN32_SkColorType, &bitmap);
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uint8_t rowColor = 0;
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for (int y = 0; y < SLIDE_SIZE; y++) {
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uint32_t* dst = bitmap.getAddr32(0, y);
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for (int x = 0; x < SLIDE_SIZE; x++) {
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dst[x] = SkPackARGB32(rowColor, rowColor,
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rowColor, rowColor);
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}
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if (rowColor == 0) {
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rowColor = 255;
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} else {
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rowColor = 0;
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}
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}
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return bitmap.asImage();
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}
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static sk_sp<SkImage> make_argb4444_stripes() {
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SkBitmap bitmap;
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init_bitmap(kARGB_4444_SkColorType, &bitmap);
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// Using draw rather than readPixels to suppress dither
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SkPaint paint;
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paint.setBlendMode(SkBlendMode::kSrc);
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SkCanvas{ bitmap }.drawImage(make_argb8888_stripes(), 0, 0, SkSamplingOptions(), &paint);
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return bitmap.asImage();
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}
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namespace skiagm {
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class BitmapPremulGM : public GM {
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public:
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BitmapPremulGM() {
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this->setBGColor(SK_ColorWHITE);
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}
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protected:
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SkString onShortName() override {
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return SkString("bitmap_premul");
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}
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SkISize onISize() override {
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return SkISize::Make(SLIDE_SIZE * 2, SLIDE_SIZE * 2);
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}
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void onDraw(SkCanvas* canvas) override {
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SkScalar slideSize = SkIntToScalar(SLIDE_SIZE);
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canvas->drawImage(make_argb8888_gradient(), 0, 0);
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canvas->drawImage(make_argb4444_gradient(), slideSize, 0);
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canvas->drawImage(make_argb8888_stripes(), 0, slideSize);
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canvas->drawImage(make_argb4444_stripes(), slideSize, slideSize);
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}
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private:
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using INHERITED = GM;
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};
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DEF_GM( return new BitmapPremulGM; )
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} // namespace skiagm
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