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