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