AuroraMiddleware/skia2
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
653212c37e
skia2/gm/textbloblooper.cpp
mtklein dbfd7ab108 Replace a lot of 'static const' with 'constexpr' or 'const'. 
'static const' means, there must be at most one of these, and initialize it at
compile time if possible or runtime if necessary.  This leads to unexpected
code execution, and TSAN* will complain about races on the guard variables.

Generally 'constexpr' or 'const' are better choices.  Neither can cause races:
they're either intialized at compile time (constexpr) or intialized each time
independently (const).

This CL prefers constexpr where possible, and uses const where not.  It even
prefers constexpr over const where they don't make a difference... I want to have
lots of examples of constexpr for people to see and mimic.

The scoped-to-class static has nothing to do with any of this, and is not changed.

* Not yet on the bots, which use an older TSAN.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2300623005

Review-Url: https://codereview.chromium.org/2300623005
2016-09-01 11:24:54 -07:00

258 lines
9.5 KiB
C++
Raw Blame History

/*
* Copyright 2013 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 "Sk2DPathEffect.h"
#include "SkBlurMask.h"
#include "SkBlurMaskFilter.h"
#include "SkColorMatrixFilter.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkLayerDrawLooper.h"
#include "SkRandom.h"
#include "SkTextBlob.h"
namespace skiagm {
constexpr int kWidth = 1250;
constexpr int kHeight = 700;
// Unlike the variant in sk_tool_utils, this version positions the glyphs on a diagonal
static void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkPaint& origPaint,
SkScalar x, SkScalar y) {
SkPaint paint(origPaint);
SkTDArray<uint16_t> glyphs;
size_t len = strlen(text);
glyphs.append(paint.textToGlyphs(text, len, nullptr));
paint.textToGlyphs(text, len, glyphs.begin());
const SkScalar advanceX = paint.getTextSize() * 0.85f;
const SkScalar advanceY = paint.getTextSize() * 1.5f;
SkTDArray<SkScalar> pos;
for (unsigned i = 0; i < len; ++i) {
*pos.append() = x + i * advanceX;
*pos.append() = y + i * (advanceY / len);
}
paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
const SkTextBlobBuilder::RunBuffer& run = builder->allocRunPos(paint, glyphs.count());
memcpy(run.glyphs, glyphs.begin(), glyphs.count() * sizeof(uint16_t));
memcpy(run.pos, pos.begin(), len * sizeof(SkScalar) * 2);
}
typedef void (*LooperProc)(SkPaint*);
struct LooperSettings {
SkXfermode::Mode fMode;
SkColor fColor;
SkPaint::Style fStyle;
SkScalar fWidth;
SkScalar fOffset;
SkScalar fSkewX;
bool fEffect;
};
static void mask_filter(SkPaint* paint) {
paint->setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
SkBlurMask::ConvertRadiusToSigma(3.f)));
}
static sk_sp<SkPathEffect> make_tile_effect() {
SkMatrix m;
m.setScale(1.f, 1.f);
SkPath path;
path.addCircle(0, 0, SkIntToScalar(5));
return SkPath2DPathEffect::Make(m, path);
}
static void path_effect(SkPaint* paint) {
paint->setPathEffect(make_tile_effect());
}
static sk_sp<SkShader> make_shader(const SkRect& bounds) {
const SkPoint pts[] = {
{ bounds.left(), bounds.top() },
{ bounds.right(), bounds.bottom() },
};
const SkColor colors[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorBLACK,
SK_ColorCYAN, SK_ColorMAGENTA, SK_ColorYELLOW,
};
return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
SkShader::kClamp_TileMode);
}
static void color_filter(SkPaint* paint) {
SkRect r;
r.setWH(SkIntToScalar(kWidth), 50);
paint->setShader(make_shader(r));
paint->setColorFilter(SkColorMatrixFilter::MakeLightingFilter(0xF0F0F0, 0));
}
static void kitchen_sink(SkPaint* paint) {
color_filter(paint);
path_effect(paint);
mask_filter(paint);
}
static sk_sp<SkDrawLooper> setupLooper(SkLayerDrawLooper::BitFlags bits,
LooperProc proc,
const LooperSettings settings[],
size_t size) {
SkLayerDrawLooper::Builder looperBuilder;
SkLayerDrawLooper::LayerInfo info;
info.fPaintBits = bits;
info.fColorMode = SkXfermode::kSrc_Mode;
for (size_t i = 0; i < size; i++) {
info.fOffset.set(settings[i].fOffset, settings[i].fOffset);
SkPaint* paint = looperBuilder.addLayer(info);
paint->setXfermodeMode(settings[i].fMode);
paint->setColor(settings[i].fColor);
paint->setStyle(settings[i].fStyle);
paint->setStrokeWidth(settings[i].fWidth);
if (settings[i].fEffect) {
(*proc)(paint);
}
}
return looperBuilder.detach();
}
class TextBlobLooperGM : public GM {
public:
TextBlobLooperGM() {}
protected:
void onOnceBeforeDraw() override {
SkTextBlobBuilder builder;
// LCD
SkPaint paint;
paint.setTextSize(32);
const char* text = "The quick brown fox jumps over the lazy dog";
paint.setSubpixelText(true);
paint.setLCDRenderText(true);
paint.setAntiAlias(true);
sk_tool_utils::set_portable_typeface(&paint);
add_to_text_blob(&builder, text, paint, 0, 0);
fBlob.reset(builder.build());
// create a looper which sandwhiches an effect in two normal draws
LooperSettings looperSandwhich[] = {
{ SkXfermode::kSrc_Mode, SK_ColorMAGENTA, SkPaint::kFill_Style, 0, 0, 0, false },
{ SkXfermode::kSrcOver_Mode, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true },
{ SkXfermode::kSrcOver_Mode, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false },
};
LooperSettings compound[] = {
{ SkXfermode::kSrc_Mode, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
{ SkXfermode::kSrc_Mode, SK_ColorRED, SkPaint::kStroke_Style, 4.f, 0, 0, false },
{ SkXfermode::kSrc_Mode, SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0, false },
{ SkXfermode::kSrcOver_Mode, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true }
};
LooperSettings xfermode[] = {
{ SkXfermode::kDifference_Mode, SK_ColorWHITE, SkPaint::kFill_Style, 0, 0, 0, false },
{ SkXfermode::kSrcOver_Mode, 0xFF000000, SkPaint::kFill_Style, 0, 1.f, 0, true },
{ SkXfermode::kSrcOver_Mode, 0x50FF00FF, SkPaint::kFill_Style, 0, 2.f, 0, false },
};
// NOTE, this should be ignored by textblobs
LooperSettings skew[] = {
{ SkXfermode::kSrc_Mode, SK_ColorRED, SkPaint::kFill_Style, 0, 0, -1.f, false },
{ SkXfermode::kSrc_Mode, SK_ColorGREEN, SkPaint::kFill_Style, 0, 10.f, -1.f, false },
{ SkXfermode::kSrc_Mode, SK_ColorBLUE, SkPaint::kFill_Style, 0, 20.f, -1.f, false },
};
LooperSettings kitchenSink[] = {
{ SkXfermode::kSrc_Mode, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
{ SkXfermode::kSrc_Mode, SK_ColorBLACK, SkPaint::kFill_Style, 0, 0, 0, false },
{ SkXfermode::kDifference_Mode, SK_ColorWHITE, SkPaint::kFill_Style, 1.f, 10.f, 0, false },
{ SkXfermode::kSrc_Mode, SK_ColorWHITE, SkPaint::kFill_Style, 0, 10.f, 0, true },
{ SkXfermode::kSrcOver_Mode, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false },
};
fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit |
SkLayerDrawLooper::kXfermode_Bit |
SkLayerDrawLooper::kStyle_Bit, &mask_filter,
compound, SK_ARRAY_COUNT(compound)));
fLoopers.push_back(setupLooper(SkLayerDrawLooper::kPathEffect_Bit |
SkLayerDrawLooper::kXfermode_Bit, &path_effect,
looperSandwhich, SK_ARRAY_COUNT(looperSandwhich)));
fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit |
SkLayerDrawLooper::kColorFilter_Bit |
SkLayerDrawLooper::kXfermode_Bit, &color_filter,
looperSandwhich, SK_ARRAY_COUNT(looperSandwhich)));
fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit |
SkLayerDrawLooper::kColorFilter_Bit |
SkLayerDrawLooper::kXfermode_Bit, &color_filter,
xfermode, SK_ARRAY_COUNT(xfermode)));
fLoopers.push_back(setupLooper(0, nullptr, skew, SK_ARRAY_COUNT(skew)));
fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit |
SkLayerDrawLooper::kShader_Bit |
SkLayerDrawLooper::kColorFilter_Bit |
SkLayerDrawLooper::kPathEffect_Bit |
SkLayerDrawLooper::kStyle_Bit |
SkLayerDrawLooper::kXfermode_Bit, &kitchen_sink,
kitchenSink, SK_ARRAY_COUNT(kitchenSink)));
// Test we respect overrides
fLoopers.push_back(setupLooper(0, &kitchen_sink,
kitchenSink, SK_ARRAY_COUNT(kitchenSink)));
}
SkString onShortName() override {
return SkString("textbloblooper");
}
SkISize onISize() override {
return SkISize::Make(kWidth, kHeight);
}
void onDraw(SkCanvas* canvas) override {
canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
SkPaint paint;
canvas->translate(10, 40);
paint.setTextSize(40);
SkRect bounds = fBlob->bounds();
int y = 0;
for (int looper = 0; looper < fLoopers.count(); looper++) {
paint.setLooper(fLoopers[looper]);
canvas->save();
canvas->translate(0, SkIntToScalar(y));
canvas->drawTextBlob(fBlob, 0, 0, paint);
canvas->restore();
y += SkScalarFloorToInt(bounds.height());
}
}
private:
SkAutoTUnref<const SkTextBlob> fBlob;
SkTArray<sk_sp<SkDrawLooper>, true> fLoopers;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new TextBlobLooperGM;)
}
Reference in New Issue View Git Blame Copy Permalink