blob: 8264a29b78125f0613cc44a92815001fa78ae523 [file] [log] [blame]
/*
* 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;)