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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorPriv.h"
#include "include/core/SkImage.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkPaint.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypes.h"
/**
* This GM checks that bitmap pixels are unpremultiplied before being exported
* to other formats. If unpremultiplication is implemented properly, this
* GM should come out completely white. If not, this GM looks like a row of two
* greyscale gradients above a row of grey lines.
* This tests both the ARGB4444 and ARGB8888 bitmap configurations.
*/
constexpr int SLIDE_SIZE = 256;
static void init_bitmap(SkColorType ct, SkBitmap* bitmap) {
bitmap->allocPixels(SkImageInfo::Make(SLIDE_SIZE, SLIDE_SIZE, ct,
kPremul_SkAlphaType));
bitmap->eraseColor(SK_ColorWHITE);
}
static sk_sp<SkImage> make_argb8888_gradient() {
SkBitmap bitmap;
init_bitmap(kN32_SkColorType, &bitmap);
for (int y = 0; y < SLIDE_SIZE; y++) {
uint32_t* dst = bitmap.getAddr32(0, y);
for (int x = 0; x < SLIDE_SIZE; x++) {
dst[x] = SkPackARGB32(y, y, y, y);
}
}
return bitmap.asImage();
}
static sk_sp<SkImage> make_argb4444_gradient() {
SkBitmap bitmap;
init_bitmap(kARGB_4444_SkColorType, &bitmap);
// Using draw rather than readPixels to suppress dither
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
SkCanvas{ bitmap }.drawImage(make_argb8888_gradient(), 0, 0, SkSamplingOptions(), &paint);
return bitmap.asImage();
}
static sk_sp<SkImage> make_argb8888_stripes() {
SkBitmap bitmap;
init_bitmap(kN32_SkColorType, &bitmap);
uint8_t rowColor = 0;
for (int y = 0; y < SLIDE_SIZE; y++) {
uint32_t* dst = bitmap.getAddr32(0, y);
for (int x = 0; x < SLIDE_SIZE; x++) {
dst[x] = SkPackARGB32(rowColor, rowColor,
rowColor, rowColor);
}
if (rowColor == 0) {
rowColor = 255;
} else {
rowColor = 0;
}
}
return bitmap.asImage();
}
static sk_sp<SkImage> make_argb4444_stripes() {
SkBitmap bitmap;
init_bitmap(kARGB_4444_SkColorType, &bitmap);
// Using draw rather than readPixels to suppress dither
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
SkCanvas{ bitmap }.drawImage(make_argb8888_stripes(), 0, 0, SkSamplingOptions(), &paint);
return bitmap.asImage();
}
namespace skiagm {
class BitmapPremulGM : public GM {
public:
BitmapPremulGM() {
this->setBGColor(SK_ColorWHITE);
}
protected:
SkString getName() const override { return SkString("bitmap_premul"); }
SkISize getISize() override { return SkISize::Make(SLIDE_SIZE * 2, SLIDE_SIZE * 2); }
void onDraw(SkCanvas* canvas) override {
SkScalar slideSize = SkIntToScalar(SLIDE_SIZE);
canvas->drawImage(make_argb8888_gradient(), 0, 0);
canvas->drawImage(make_argb4444_gradient(), slideSize, 0);
canvas->drawImage(make_argb8888_stripes(), 0, slideSize);
canvas->drawImage(make_argb4444_stripes(), slideSize, slideSize);
}
private:
using INHERITED = GM;
};
DEF_GM( return new BitmapPremulGM; )
} // namespace skiagm
static constexpr int kBoxSize = 31;
static constexpr int kPadding = 5;
static sk_sp<SkImage> make_out_of_gamut_image(SkColorType ct) {
SkBitmap bmp;
// Odd dimensions so that we hit the different implementation in the SIMD tail handling
bmp.allocPixels(SkImageInfo::Make(kBoxSize, kBoxSize, ct, kPremul_SkAlphaType));
for (int y = 0; y < kBoxSize; ++y) {
for (int x = 0; x < kBoxSize; ++x) {
*bmp.getAddr32(x, y) = (0x40000000 | ((x * 8) << 8) | ((y * 8) << 0));
}
}
return bmp.asImage();
}
DEF_SIMPLE_GM(image_out_of_gamut, canvas, 2 * kBoxSize + 3 * kPadding, kBoxSize + 2 * kPadding) {
// This GM draws an image with out-of-gamut colors (RGB > A). Historically, Skia assumed this
// was impossible, and contained numerous asserts and optimizations that would break if the
// rule were violated. With color spaces and/or SkSL shaders (among other things), it's no
// longer reasonable to make this claim. To catch issues with legacy blitters, this draws both
// RGBA and BGRA. (This ensures that we always hit the N32 -> N32 case).
canvas->clear(SK_ColorGRAY);
auto rgba = make_out_of_gamut_image(kRGBA_8888_SkColorType),
bgra = make_out_of_gamut_image(kBGRA_8888_SkColorType);
canvas->translate(kPadding, kPadding);
canvas->drawImage(rgba, 0, 0);
canvas->translate(kBoxSize + kPadding, 0);
canvas->drawImage(bgra, 0, 0);
}