| /* |
| * Copyright 2019 Google LLC |
| * |
| * 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/SkColor.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkSurface.h" |
| #include "include/gpu/GrContext.h" |
| #include "src/core/SkAutoPixmapStorage.h" |
| #include "src/core/SkConvertPixels.h" |
| #include "tools/Resources.h" |
| #include "tools/ToolUtils.h" |
| |
| // Draws the image to a surface, does a asyncRescaleAndReadPixels of the image, and then sticks |
| // the result in a raster image. |
| static sk_sp<SkImage> do_read_and_scale( |
| SkImage* image, const SkIRect& srcRect, const SkImageInfo& ii, |
| SkSurface::RescaleGamma rescaleGamma, SkFilterQuality quality, |
| std::function<sk_sp<SkSurface>(const SkImageInfo&)> makeSurface) { |
| SkBitmap bmp; |
| bmp.allocPixels(ii); |
| // Turn the image into a surface in order to call the read and rescale API |
| auto surf = makeSurface(image->imageInfo().makeWH(image->width(), image->height())); |
| if (!surf) { |
| return nullptr; |
| } |
| SkPaint paint; |
| paint.setBlendMode(SkBlendMode::kSrc); |
| surf->getCanvas()->drawImage(image, 0, 0, &paint); |
| struct Context { |
| SkPixmap fPixmap; |
| bool fCalled = false; |
| } context; |
| SkAssertResult(bmp.peekPixels(&context.fPixmap)); |
| auto callback = [](void* c, const void* data, size_t rowBytes) { |
| auto context = reinterpret_cast<Context*>(c); |
| context->fCalled = true; |
| if (!data) { |
| context->fPixmap.reset(); |
| return; |
| } |
| SkRectMemcpy(context->fPixmap.writable_addr(), context->fPixmap.rowBytes(), data, rowBytes, |
| context->fPixmap.info().minRowBytes(), context->fPixmap.height()); |
| }; |
| surf->asyncRescaleAndReadPixels(ii, srcRect, rescaleGamma, quality, callback, &context); |
| while (!context.fCalled) { |
| // Only GPU should actually be asynchronous. |
| SkASSERT(surf->getCanvas()->getGrContext()); |
| surf->getCanvas()->getGrContext()->checkAsyncWorkCompletion(); |
| } |
| return SkImage::MakeFromBitmap(bmp); |
| } |
| |
| // Draws a grid of rescales. The columns are none, low, and high filter quality. The rows are |
| // rescale in src gamma and rescale in linear gamma. |
| static skiagm::DrawResult do_rescale_grid(SkCanvas* canvas, const char* imageFile, |
| const SkIRect& srcRect, int newW, int newH, |
| SkString* errorMsg) { |
| if (canvas->imageInfo().colorType() == kUnknown_SkColorType) { |
| *errorMsg = "Not supported on recording/vector backends."; |
| return skiagm::DrawResult::kSkip; |
| } |
| auto image = GetResourceAsImage(imageFile); |
| if (!image) { |
| errorMsg->printf("Could not load image file %s.", imageFile); |
| return skiagm::DrawResult::kFail; |
| } |
| const auto ii = canvas->imageInfo().makeWH(newW, newH); |
| auto makeSurface = [canvas](const SkImageInfo& info) { return canvas->makeSurface(info); }; |
| |
| canvas->save(); |
| for (auto linear : {SkSurface::RescaleGamma::kSrc, SkSurface::RescaleGamma::kLinear}) { |
| canvas->save(); |
| for (auto quality : {kNone_SkFilterQuality, kLow_SkFilterQuality, kHigh_SkFilterQuality}) { |
| auto rescaled = |
| do_read_and_scale(image.get(), srcRect, ii, linear, quality, makeSurface); |
| canvas->drawImage(rescaled, 0, 0); |
| canvas->translate(newW, 0); |
| } |
| canvas->restore(); |
| canvas->translate(0, newH); |
| } |
| canvas->restore(); |
| return skiagm::DrawResult::kOk; |
| } |
| |
| #define DEF_RESCALE_AND_READ_GM(IMAGE_FILE, TAG, SRC_RECT, W, H) \ |
| DEF_SIMPLE_GM_CAN_FAIL(async_rescale_and_read_##TAG, canvas, errorMsg, 3 * W, 2 * H) { \ |
| ToolUtils::draw_checkerboard(canvas, SK_ColorDKGRAY, SK_ColorLTGRAY, 25); \ |
| return do_rescale_grid(canvas, #IMAGE_FILE, SRC_RECT, W, H, errorMsg); \ |
| } |
| |
| DEF_RESCALE_AND_READ_GM(images/yellow_rose.webp, rose, SkIRect::MakeXYWH(100, 20, 100, 100), |
| 410, 410) |
| |
| DEF_RESCALE_AND_READ_GM(images/dog.jpg, dog_down, SkIRect::MakeXYWH(0, 10, 180, 150), 45, 45) |
| DEF_RESCALE_AND_READ_GM(images/dog.jpg, dog_up, SkIRect::MakeWH(180, 180), 680, 400) |
| |
| DEF_RESCALE_AND_READ_GM(images/text.png, text_down, SkIRect::MakeWH(637, 105), (int)(0.7 * 637), |
| (int)(0.7 * 105)) |
| DEF_RESCALE_AND_READ_GM(images/text.png, text_up, SkIRect::MakeWH(637, 105), (int)(1.2 * 637), |
| (int)(1.2 * 105)) |
| DEF_RESCALE_AND_READ_GM(images/text.png, text_up_large, SkIRect::MakeXYWH(300, 0, 300, 105), |
| (int)(2.4 * 300), (int)(2.4 * 105)) |