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skia2/gm/textbloblooper.cpp
Ben Wagner 51e15a69ce Use SkTextEncoding enum instead of macros. 
Change-Id: I4b6259590fa0693ee0522b4999a1c0fe250b173d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/212504
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2019-05-07 20:54:16 +00:00

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/*
* 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/gm.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkBlurTypes.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkDrawLooper.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkMaskFilter.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkPathEffect.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTextBlob.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/Sk2DPathEffect.h"
#include "include/effects/SkColorMatrixFilter.h"
#include "include/effects/SkGradientShader.h"
#include "include/effects/SkLayerDrawLooper.h"
#include "include/private/SkTArray.h"
#include "include/private/SkTDArray.h"
#include "src/core/SkBlurMask.h"
#include "tools/ToolUtils.h"
#include <string.h>
namespace skiagm {
constexpr int kWidth = 1250;
constexpr int kHeight = 700;
// Unlike the variant in ToolUtils, this version positions the glyphs on a diagonal
static void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkFont& font,
SkScalar x, SkScalar y) {
SkTDArray<uint16_t> glyphs;
size_t len = strlen(text);
glyphs.append(font.countText(text, len, SkTextEncoding::kUTF8));
font.textToGlyphs(text, len, SkTextEncoding::kUTF8, glyphs.begin(), glyphs.count());
const SkScalar advanceX = font.getSize() * 0.85f;
const SkScalar advanceY = font.getSize() * 1.5f;
SkTDArray<SkScalar> pos;
for (unsigned i = 0; i < len; ++i) {
*pos.append() = x + i * advanceX;
*pos.append() = y + i * (advanceY / len);
}
const SkTextBlobBuilder::RunBuffer& run = builder->allocRunPos(font, 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 {
SkBlendMode fMode;
SkColor fColor;
SkPaint::Style fStyle;
SkScalar fWidth;
SkScalar fOffset;
SkScalar fSkewX;
bool fEffect;
};
static void mask_filter(SkPaint* paint) {
paint->setMaskFilter(SkMaskFilter::MakeBlur(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),
SkTileMode::kClamp);
}
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 = SkBlendMode::kSrc;
for (size_t i = 0; i < size; i++) {
info.fOffset.set(settings[i].fOffset, settings[i].fOffset);
SkPaint* paint = looperBuilder.addLayer(info);
paint->setBlendMode(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
SkFont font;
font.setSize(32);
const char* text = "The quick brown fox jumps over the lazy dog";
font.setSubpixel(true);
font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
font.setTypeface(ToolUtils::create_portable_typeface());
add_to_text_blob(&builder, text, font, 0, 0);
fBlob = builder.make();
// create a looper which sandwhiches an effect in two normal draws
LooperSettings looperSandwhich[] = {
{ SkBlendMode::kSrc, SK_ColorMAGENTA, SkPaint::kFill_Style, 0, 0, 0, false },
{ SkBlendMode::kSrcOver, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true },
{ SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false },
};
LooperSettings compound[] = {
{ SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
{ SkBlendMode::kSrc, SK_ColorRED, SkPaint::kStroke_Style, 4.f, 0, 0, false },
{ SkBlendMode::kSrc, SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0, false },
{ SkBlendMode::kSrcOver, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true }
};
LooperSettings xfermode[] = {
{ SkBlendMode::kDifference, SK_ColorWHITE, SkPaint::kFill_Style, 0, 0, 0, false },
{ SkBlendMode::kSrcOver, 0xFF000000, SkPaint::kFill_Style, 0, 1.f, 0, true },
{ SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 2.f, 0, false },
};
// NOTE, this should be ignored by textblobs
LooperSettings skew[] = {
{ SkBlendMode::kSrc, SK_ColorRED, SkPaint::kFill_Style, 0, 0, -1.f, false },
{ SkBlendMode::kSrc, SK_ColorGREEN, SkPaint::kFill_Style, 0, 10.f, -1.f, false },
{ SkBlendMode::kSrc, SK_ColorBLUE, SkPaint::kFill_Style, 0, 20.f, -1.f, false },
};
LooperSettings kitchenSink[] = {
{ SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
{ SkBlendMode::kSrc, SK_ColorBLACK, SkPaint::kFill_Style, 0, 0, 0, false },
{ SkBlendMode::kDifference, SK_ColorWHITE, SkPaint::kFill_Style, 1.f, 10.f, 0, false },
{ SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kFill_Style, 0, 10.f, 0, true },
{ SkBlendMode::kSrcOver, 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_ColorGRAY);
SkPaint paint;
canvas->translate(10, 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:
sk_sp<SkTextBlob> fBlob;
SkTArray<sk_sp<SkDrawLooper>> fLoopers;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new TextBlobLooperGM;)
}
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