| /* |
| * Copyright 2019 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/SkColor.h" |
| #include "include/core/SkColorFilter.h" |
| #include "include/core/SkFont.h" |
| #include "include/core/SkFontTypes.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkOverdrawCanvas.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkSurface.h" |
| #include "include/core/SkTypes.h" |
| #include "include/effects/SkOverdrawColorFilter.h" |
| |
| #define WIDTH 500 |
| #define HEIGHT 500 |
| |
| static const SkColor kOverdrawColors[6] = { |
| 0x00000000, 0x5fff0000, 0x2f0000ff, 0x2f00ff00, 0x3fff0000, 0x7fff0000, |
| }; |
| |
| |
| DEF_SIMPLE_GM_BG(overdraw_canvas, canvas, WIDTH, HEIGHT, SK_ColorWHITE) { |
| // Set up the overdraw canvas. |
| SkImageInfo offscreenInfo = SkImageInfo::MakeA8(WIDTH, HEIGHT); |
| sk_sp<SkSurface> offscreen = SkSurfaces::Raster(offscreenInfo); |
| auto c = offscreen->getCanvas(); |
| |
| SkOverdrawCanvas overdrawCanvas(c); |
| |
| overdrawCanvas.drawRect(SkRect::MakeLTRB(10, 10, 200, 200), SkPaint()); |
| overdrawCanvas.drawRect(SkRect::MakeLTRB(20, 20, 190, 190), SkPaint()); |
| overdrawCanvas.drawRect(SkRect::MakeLTRB(30, 30, 180, 180), SkPaint()); |
| overdrawCanvas.drawRect(SkRect::MakeLTRB(40, 40, 170, 170), SkPaint()); |
| overdrawCanvas.drawRect(SkRect::MakeLTRB(50, 50, 160, 160), SkPaint()); |
| overdrawCanvas.drawRect(SkRect::MakeLTRB(60, 60, 150, 150), SkPaint()); |
| |
| char text[] = "Ae_p"; |
| overdrawCanvas.drawSimpleText(text, 4, SkTextEncoding::kUTF8, 300, 300, SkFont(), SkPaint()); |
| |
| sk_sp<SkImage> counts = offscreen->makeImageSnapshot(); |
| |
| // Draw overdraw colors to the canvas. The color filter will convert counts to colors. |
| SkPaint paint; |
| paint.setColorFilter(SkOverdrawColorFilter::MakeWithSkColors(kOverdrawColors)); |
| canvas->drawImage(counts.get(), 0.0f, 0.0f, SkSamplingOptions(), &paint); |
| canvas->drawString("This is some text:", 180, 300, SkFont(), SkPaint()); |
| } |
| |
| static sk_sp<SkImage> overdraw_text_grid(bool useCTM) { |
| auto surface = SkSurfaces::Raster(SkImageInfo::MakeA8(256, 512)); |
| auto canvas = SkOverdrawCanvas(surface->getCanvas()); |
| |
| SkPaint paint; |
| paint.setColor(SK_ColorWHITE); |
| |
| for (int n = 1; n <= 20; n++) { |
| const float x = 10.0f; |
| const float y = n * 20.0f; |
| |
| for (int i = 0; i < n * 10; i++) { |
| const char* text = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
| if (useCTM) { |
| canvas.save(); |
| canvas.translate(x, y); |
| canvas.drawString(text, 0, 0, SkFont(), paint); |
| canvas.restore(); |
| } else { |
| canvas.drawString(text, x, y, SkFont(), paint); |
| } |
| } |
| } |
| return surface->makeImageSnapshot(); |
| } |
| |
| // This GM tests the underlying problem from skbug.com/13732. Text drawn through an overdraw |
| // canvas would have the CTM applied twice. If everything is working, both images generated should |
| // look identical. When the bug was present, the second image would have the lines "double spaced", |
| // because the translations were applied twice. |
| DEF_SIMPLE_GM_BG(overdraw_text_xform, canvas, 512, 512, SK_ColorBLACK) { |
| SkPaint imgPaint; |
| imgPaint.setColor(SK_ColorWHITE); |
| canvas->drawImage(overdraw_text_grid(false), 0, 0, SkSamplingOptions{}, &imgPaint); |
| canvas->drawImage(overdraw_text_grid( true), 256, 0, SkSamplingOptions{}, &imgPaint); |
| } |