| /* |
| * Copyright 2011 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/SkFont.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTypeface.h" |
| #include "include/core/SkTypes.h" |
| |
| class LcdTextGM : public skiagm::GM { |
| static constexpr SkScalar kTextHeight = 36; |
| SkScalar fY = kTextHeight; |
| |
| SkString onShortName() override { return SkString("lcdtext"); } |
| |
| SkISize onISize() override { return {640, 480}; } |
| |
| void onDraw(SkCanvas* canvas) override { |
| fY = kTextHeight; |
| drawText(canvas, SkString("TEXT: SubpixelTrue LCDRenderTrue"), |
| true, true); |
| drawText(canvas, SkString("TEXT: SubpixelTrue LCDRenderFalse"), |
| true, false); |
| drawText(canvas, SkString("TEXT: SubpixelFalse LCDRenderTrue"), |
| false, true); |
| drawText(canvas, SkString("TEXT: SubpixelFalse LCDRenderFalse"), |
| false, false); |
| } |
| |
| void drawText(SkCanvas* canvas, const SkString& string, |
| bool subpixelTextEnabled, bool lcdRenderTextEnabled) { |
| SkPaint paint; |
| paint.setColor(SK_ColorBLACK); |
| paint.setDither(true); |
| SkFont font(nullptr, kTextHeight); |
| if (subpixelTextEnabled) { |
| font.setSubpixel(true); |
| } |
| if (lcdRenderTextEnabled) { |
| font.setEdging(SkFont::Edging::kSubpixelAntiAlias); |
| } |
| canvas->drawString(string, 0, fY, font, paint); |
| fY += kTextHeight; |
| } |
| }; |
| |
| /* |
| * Skia will automatically disable LCD requests if the total size exceeds some limit |
| * (hard coded in this test for now, as it is now avaiable as an API) |
| * |
| * Test this both by changing "textsize" and by changing the computed size (textsize * CTM) |
| */ |
| class LcdTextSizeGM : public skiagm::GM { |
| static void ScaleAbout(SkCanvas* canvas, SkScalar sx, SkScalar sy, SkScalar px, SkScalar py) { |
| SkMatrix m; |
| m.setScale(sx, sy, px, py); |
| canvas->concat(m); |
| } |
| |
| SkString onShortName() override { return SkString("lcdtextsize"); } |
| |
| SkISize onISize() override { return {320, 120}; } |
| |
| void onDraw(SkCanvas* canvas) override { |
| const char* lcd_text = "LCD"; |
| const char* gray_text = "GRAY"; |
| |
| constexpr static float kLCDTextSizeLimit = 48; |
| |
| const struct { |
| SkPoint fLoc; |
| SkScalar fTextSize; |
| SkScalar fScale; |
| const char* fText; |
| } rec[] = { |
| { { 10, 50 }, kLCDTextSizeLimit - 1, 1, lcd_text }, |
| { { 160, 50 }, kLCDTextSizeLimit + 1, 1, gray_text }, |
| { { 10, 100 }, kLCDTextSizeLimit / 2, 1.99f, lcd_text }, |
| { { 160, 100 }, kLCDTextSizeLimit / 2, 2.01f, gray_text }, |
| }; |
| |
| for (size_t i = 0; i < std::size(rec); ++i) { |
| const SkPoint loc = rec[i].fLoc; |
| SkAutoCanvasRestore acr(canvas, true); |
| |
| SkFont font(nullptr, rec[i].fTextSize); |
| font.setEdging(SkFont::Edging::kSubpixelAntiAlias); |
| |
| ScaleAbout(canvas, rec[i].fScale, rec[i].fScale, loc.x(), loc.y()); |
| canvas->drawString(rec[i].fText, loc.x(), loc.y(), font, SkPaint()); |
| } |
| } |
| }; |
| |
| class SaveLayerPreserveLCDTextGM : public skiagm::GM { |
| static constexpr SkScalar kTextHeight = 36; |
| |
| SkString onShortName() override { return SkString("savelayerpreservelcdtext"); } |
| |
| SkISize onISize() override { return {620, 300}; } |
| |
| void onDraw(SkCanvas* canvas) override { |
| drawText(canvas, SkString("SaveLayer PreserveLCDText"), 50, |
| SkCanvas::kPreserveLCDText_SaveLayerFlag); |
| drawText(canvas, SkString("SaveLayer Default (LCDText not preserved)"), 150, 0); |
| } |
| |
| void drawText(SkCanvas* canvas, |
| const SkString& string, |
| int y, |
| SkCanvas::SaveLayerFlags saveLayerFlags) { |
| SkCanvas::SaveLayerRec rec(nullptr, nullptr, saveLayerFlags); |
| canvas->saveLayer(rec); |
| SkPaint paint; |
| paint.setColor(SK_ColorWHITE); |
| canvas->drawRect(SkRect::MakeXYWH(0, y - 10, 640, kTextHeight + 20), paint); |
| paint.setColor(SK_ColorBLACK); |
| SkFont font(nullptr, kTextHeight); |
| font.setEdging(SkFont::Edging::kSubpixelAntiAlias); |
| canvas->drawString(string, 10, y, font, paint); |
| canvas->restore(); |
| } |
| }; |
| |
| DEF_GM(return new LcdTextGM;) |
| DEF_GM(return new LcdTextSizeGM;) |
| DEF_GM(return new SaveLayerPreserveLCDTextGM;) |