| /* |
| * 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); |
| } |