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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkCanvas.h"
#include "SkPath.h"
#include "SkTypeface.h"
#include "SkRandom.h"
/**
* Draws text with random parameters. The text draws each get their own clip rect. It is also
* used as a bench to measure how well the GPU backend batches text draws.
*/
class VariedTextGM : public skiagm::GM {
public:
VariedTextGM(bool effectiveClip, bool lcd)
: fEffectiveClip(effectiveClip)
, fLCD(lcd) {
}
protected:
SkString onShortName() override {
SkString name("varied_text");
if (fEffectiveClip) {
name.append("_clipped");
} else {
name.append("_ignorable_clip");
}
if (fLCD) {
name.append("_lcd");
} else {
name.append("_no_lcd");
}
return name;
}
SkISize onISize() override {
return SkISize::Make(640, 480);
}
void onOnceBeforeDraw() override {
fPaint.setAntiAlias(true);
fPaint.setLCDRenderText(fLCD);
SkISize size = this->getISize();
SkScalar w = SkIntToScalar(size.fWidth);
SkScalar h = SkIntToScalar(size.fHeight);
static_assert(4 == SK_ARRAY_COUNT(fTypefaces), "typeface_cnt");
fTypefaces[0] = sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle());
fTypefaces[1] = sk_tool_utils::create_portable_typeface("sans-serif",
SkFontStyle::FromOldStyle(SkTypeface::kBold));
fTypefaces[2] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle());
fTypefaces[3] = sk_tool_utils::create_portable_typeface("serif",
SkFontStyle::FromOldStyle(SkTypeface::kBold));
SkRandom random;
for (int i = 0; i < kCnt; ++i) {
int length = random.nextRangeU(kMinLength, kMaxLength);
char text[kMaxLength];
for (int j = 0; j < length; ++j) {
text[j] = (char)random.nextRangeU('!', 'z');
}
fStrings[i].set(text, length);
fColors[i] = random.nextU();
fColors[i] |= 0xFF000000;
fColors[i] = sk_tool_utils::color_to_565(fColors[i]);
static const SkScalar kMinPtSize = 8.f;
static const SkScalar kMaxPtSize = 32.f;
fPtSizes[i] = random.nextRangeScalar(kMinPtSize, kMaxPtSize);
fTypefaceIndices[i] = random.nextULessThan(SK_ARRAY_COUNT(fTypefaces));
SkRect r;
fPaint.setColor(fColors[i]);
fPaint.setTypeface(fTypefaces[fTypefaceIndices[i]]);
fPaint.setTextSize(fPtSizes[i]);
fPaint.measureText(fStrings[i].c_str(), fStrings[i].size(), &r);
// safeRect is set of x,y positions where we can draw the string without hitting
// the GM's border.
SkRect safeRect = SkRect::MakeLTRB(-r.fLeft, -r.fTop, w - r.fRight, h - r.fBottom);
if (safeRect.isEmpty()) {
// If we don't fit then just don't worry about how we get cliped to the device
// border.
safeRect = SkRect::MakeWH(w, h);
}
fPositions[i].fX = random.nextRangeScalar(safeRect.fLeft, safeRect.fRight);
fPositions[i].fY = random.nextRangeScalar(safeRect.fTop, safeRect.fBottom);
fClipRects[i] = r;
fClipRects[i].offset(fPositions[i].fX, fPositions[i].fY);
fClipRects[i].outset(2.f, 2.f);
if (fEffectiveClip) {
fClipRects[i].fRight -= 0.25f * fClipRects[i].width();
}
}
}
void onDraw(SkCanvas* canvas) override {
for (int i = 0; i < kCnt; ++i) {
fPaint.setColor(fColors[i]);
fPaint.setTextSize(fPtSizes[i]);
fPaint.setTypeface(fTypefaces[fTypefaceIndices[i]]);
canvas->save();
canvas->clipRect(fClipRects[i]);
canvas->translate(fPositions[i].fX, fPositions[i].fY);
canvas->drawText(fStrings[i].c_str(), fStrings[i].size(), 0, 0, fPaint);
canvas->restore();
}
// Visualize the clips, but not in bench mode.
if (kBench_Mode != this->getMode()) {
SkPaint wirePaint;
wirePaint.setAntiAlias(true);
wirePaint.setStrokeWidth(0);
wirePaint.setStyle(SkPaint::kStroke_Style);
for (int i = 0; i < kCnt; ++i) {
canvas->drawRect(fClipRects[i], wirePaint);
}
}
}
bool runAsBench() const override { return true; }
private:
static const int kCnt = 30;
static const int kMinLength = 15;
static const int kMaxLength = 40;
bool fEffectiveClip;
bool fLCD;
sk_sp<SkTypeface> fTypefaces[4];
SkPaint fPaint;
// precomputed for each text draw
SkString fStrings[kCnt];
SkColor fColors[kCnt];
SkScalar fPtSizes[kCnt];
int fTypefaceIndices[kCnt];
SkPoint fPositions[kCnt];
SkRect fClipRects[kCnt];
typedef skiagm::GM INHERITED;
};
DEF_GM(return new VariedTextGM(false, false);)
DEF_GM(return new VariedTextGM(true, false);)
DEF_GM(return new VariedTextGM(false, true);)
DEF_GM(return new VariedTextGM(true, true);)
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