| /* |
| * Copyright 2020 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/SkCanvas.h" |
| #include "include/core/SkImage.h" |
| #include "include/gpu/GrDirectContext.h" |
| #include "include/gpu/GrRecordingContext.h" |
| #include "src/core/SkCompressedDataUtils.h" |
| #include "src/gpu/GrCaps.h" |
| #include "src/gpu/GrRecordingContextPriv.h" |
| #include "src/image/SkImage_Base.h" |
| #include "src/image/SkImage_GpuBase.h" |
| |
| constexpr int kImgWidth = 16; |
| constexpr int kImgHeight = 8; |
| constexpr int kPad = 4; |
| |
| struct BC1Block { |
| uint16_t fColor0; |
| uint16_t fColor1; |
| uint32_t fIndices; |
| }; |
| |
| static int num_4x4_blocks(int size) { |
| return ((size + 3) & ~3) >> 2; |
| } |
| |
| static uint16_t to565(SkColor col) { |
| int r5 = SkMulDiv255Round(31, SkColorGetR(col)); |
| int g6 = SkMulDiv255Round(63, SkColorGetG(col)); |
| int b5 = SkMulDiv255Round(31, SkColorGetB(col)); |
| |
| return (r5 << 11) | (g6 << 5) | b5; |
| } |
| |
| // BC1 has per-block transparency. If, taken as ints, |
| // fColor0 < fColor1 -> the block has transparency (& it is in color3) |
| // fColor1 > fColor0 -> the block is opaque |
| // |
| // This method can create two blocks to test out BC1's behavior. If BC1 |
| // behaves as expected (i.e., w/ per-block transparency) then, for RGBA textures, |
| // the transparent block(s) should appear as: |
| // opaque black, medium grey, transparent black, white. |
| // and the opaque block(s) should appear as: |
| // opaque black, dark grey, light grey, white |
| // |
| // For RGB textures, however, the transparent block(s) should appear as: |
| // opaque black, medium grey, _opaque_ black, white |
| // and the opaque block(s) should appear as: |
| // opaque black, dark grey, light grey, white. |
| static void create_BC1_block(BC1Block* block, bool transparent) { |
| unsigned int byte; |
| |
| if (transparent) { |
| block->fColor0 = to565(SK_ColorBLACK); |
| block->fColor1 = to565(SK_ColorWHITE); |
| SkASSERT(block->fColor0 <= block->fColor1); // this signals a transparent block |
| // opaque black (col0), medium grey (col2), transparent black (col3), white (col1). |
| byte = (0x0 << 0) | (0x2 << 2) | (0x3 << 4) | (0x1 << 6); |
| } else { |
| block->fColor0 = to565(SK_ColorWHITE); |
| block->fColor1 = to565(SK_ColorBLACK); |
| SkASSERT(block->fColor0 > block->fColor1); // this signals an opaque block |
| // opaque black (col1), dark grey (col3), light grey (col2), white (col0) |
| byte = (0x1 << 0) | (0x3 << 2) | (0x2 << 4) | (0x0 << 6); |
| } |
| |
| block->fIndices = (byte << 24) | (byte << 16) | (byte << 8) | byte; |
| } |
| |
| // This makes a 16x8 BC1 texture which has the top 4 rows be officially transparent |
| // and the bottom 4 rows be officially opaque. |
| static sk_sp<SkData> make_compressed_data() { |
| SkISize dim{ kImgWidth, kImgHeight }; |
| |
| size_t totalSize = SkCompressedDataSize(SkImage::CompressionType::kBC1_RGB8_UNORM, dim, |
| nullptr, false); |
| |
| sk_sp<SkData> tmp = SkData::MakeUninitialized(totalSize); |
| BC1Block* dstBlocks = reinterpret_cast<BC1Block*>(tmp->writable_data()); |
| |
| BC1Block transBlock, opaqueBlock; |
| create_BC1_block(&transBlock, true); |
| create_BC1_block(&opaqueBlock, false); |
| |
| int numXBlocks = num_4x4_blocks(kImgWidth); |
| int numYBlocks = num_4x4_blocks(kImgHeight); |
| |
| for (int y = 0; y < numYBlocks; ++y) { |
| for (int x = 0; x < numXBlocks; ++x) { |
| dstBlocks[y*numXBlocks + x] = (y < numYBlocks/2) ? transBlock : opaqueBlock; |
| } |
| } |
| |
| return tmp; |
| } |
| |
| static sk_sp<SkImage> data_to_img(GrDirectContext *direct, sk_sp<SkData> data, |
| SkImage::CompressionType compression) { |
| if (direct) { |
| return SkImage::MakeTextureFromCompressed(direct, std::move(data), |
| kImgWidth, |
| kImgHeight, |
| compression, |
| GrMipmapped::kNo); |
| } else { |
| return SkImage::MakeRasterFromCompressed(std::move(data), |
| kImgWidth, |
| kImgHeight, |
| compression); |
| } |
| } |
| |
| static void draw_image(SkCanvas* canvas, sk_sp<SkImage> image, int x, int y) { |
| |
| bool isCompressed = false; |
| if (image && image->isTextureBacked()) { |
| GrRecordingContext* rContext = ((SkImage_GpuBase*) image.get())->context(); |
| const GrCaps* caps = rContext->priv().caps(); |
| |
| GrTextureProxy* proxy = as_IB(image)->peekProxy(); |
| isCompressed = caps->isFormatCompressed(proxy->backendFormat()); |
| } |
| |
| canvas->drawImage(image, x, y); |
| |
| if (!isCompressed) { |
| SkRect r = SkRect::MakeXYWH(x, y, kImgWidth, kImgHeight); |
| r.outset(1.0f, 1.0f); |
| |
| SkPaint redStroke; |
| redStroke.setColor(SK_ColorRED); |
| redStroke.setStyle(SkPaint::kStroke_Style); |
| redStroke.setStrokeWidth(2.0f); |
| |
| canvas->drawRect(r, redStroke); |
| } |
| } |
| |
| namespace skiagm { |
| |
| // This GM draws the BC1 compressed texture filled with "make_compressed_data"s data twice. |
| // |
| // It is drawn once (on the top) as a kBC1_RGB8_UNORM texture and then again (on the bottom) |
| // as a kBC1_RGBA8_UNORM texture. |
| // |
| // If BC1 behaves as expected we should see: |
| // |
| // RGB8 Black MidGrey Black* White ... |
| // Black DrkGrey LtGrey White ... |
| // |
| // RGBA8 Black MidGrey Green+ White ... |
| // Black DrkGrey LtGrey White ... |
| // |
| // * We expect this to be black bc the transparent black will be forced to opaque. If BC1 were |
| // treating it as an opaque block then it would be LtGrey - not black. |
| // + This is just the background showing through the transparent black |
| class BC1TransparencyGM : public GM { |
| public: |
| BC1TransparencyGM() { |
| this->setBGColor(SK_ColorGREEN); |
| } |
| |
| protected: |
| |
| SkString onShortName() override { |
| return SkString("bc1_transparency"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(kImgWidth + 2 * kPad, 2 * kImgHeight + 3 * kPad); |
| } |
| |
| DrawResult onGpuSetup(GrDirectContext* dContext, SkString* errorMsg) override { |
| if (dContext && dContext->abandoned()) { |
| // This isn't a GpuGM so a null 'context' is okay but an abandoned context |
| // if forbidden. |
| return DrawResult::kSkip; |
| } |
| |
| sk_sp<SkData> bc1Data = make_compressed_data(); |
| |
| fRGBImage = data_to_img(dContext, bc1Data, SkImage::CompressionType::kBC1_RGB8_UNORM); |
| fRGBAImage = data_to_img(dContext, std::move(bc1Data), |
| SkImage::CompressionType::kBC1_RGBA8_UNORM); |
| if (!fRGBImage || !fRGBAImage) { |
| *errorMsg = "Failed to create BC1 images."; |
| return DrawResult::kFail; |
| } |
| |
| return DrawResult::kOk; |
| } |
| |
| void onGpuTeardown() override { |
| fRGBImage = nullptr; |
| fRGBAImage = nullptr; |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| draw_image(canvas, fRGBImage, kPad, kPad); |
| draw_image(canvas, fRGBAImage, kPad, 2 * kPad + kImgHeight); |
| } |
| |
| private: |
| sk_sp<SkImage> fRGBImage; |
| sk_sp<SkImage> fRGBAImage; |
| |
| using INHERITED = GM; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM(return new BC1TransparencyGM;) |
| } // namespace skiagm |