111 lines
3.7 KiB
C++
111 lines
3.7 KiB
C++
/*
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* Copyright 2020 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/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkRSXform.h"
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#include "include/core/SkShader.h"
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#include "include/core/SkSurface.h"
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#include "include/core/SkTextBlob.h"
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#include "tools/ToolUtils.h"
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// Exercises RSX text blobs + shader with various local matrix combinations.
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// Yellow grid should stay aligned for text vs. background.
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class RSXShaderGM : public skiagm::GM {
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public:
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private:
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SkString onShortName() override {
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return SkString("rsx_blob_shader");
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}
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SkISize onISize() override {
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return SkISize::Make(kSZ*kScale*2.1f, kSZ*kScale*2.1f);
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}
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void onOnceBeforeDraw() override {
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const SkFontStyle style(SkFontStyle::kExtraBlack_Weight,
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SkFontStyle::kNormal_Width,
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SkFontStyle::kUpright_Slant);
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SkFont font(ToolUtils::create_portable_typeface(nullptr, style), kFontSZ);
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font.setEdging(SkFont::Edging::kAntiAlias);
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static constexpr char txt[] = "TEST";
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SkGlyphID glyphs[16];
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float widths[16];
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const auto glyph_count = font.textToGlyphs(txt, strlen(txt), SkTextEncoding::kUTF8,
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glyphs, SK_ARRAY_COUNT(glyphs));
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font.getWidths(glyphs, glyph_count, widths);
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SkTextBlobBuilder builder;
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const auto& buf = builder.allocRunRSXform(font, glyph_count);
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std::copy(glyphs, glyphs + glyph_count, buf.glyphs);
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float x = 0;
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for (int i = 0; i < glyph_count; ++i) {
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buf.xforms()[i] = {
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1, 0,
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x, 0,
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};
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x += widths[i];
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}
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fBlob = builder.make();
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}
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void onDraw(SkCanvas* canvas) override {
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canvas->scale(kScale, kScale);
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this->draw_one(canvas,
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{0, 0}, SkMatrix::I(), SkMatrix::I());
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this->draw_one(canvas,
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{kSZ*1.1f, 0}, SkMatrix::Scale(2, 2), SkMatrix::I());
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this->draw_one(canvas,
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{0, kSZ*1.1f}, SkMatrix::I(), SkMatrix::RotateDeg(45));
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this->draw_one(canvas,
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{kSZ*1.1f, kSZ*1.1f}, SkMatrix::Scale(2, 2), SkMatrix::RotateDeg(45));
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}
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void draw_one(SkCanvas* canvas, SkPoint pos, const SkMatrix& lm,
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const SkMatrix& outer_lm) const {
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SkAutoCanvasRestore acr(canvas, true);
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canvas->translate(pos.fX, pos.fY);
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SkPaint p;
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p.setShader(make_shader(lm, outer_lm));
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p.setAlphaf(0.75f);
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canvas->drawRect(SkRect::MakeWH(kSZ, kSZ), p);
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p.setAlphaf(1);
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canvas->drawTextBlob(fBlob, 0, kFontSZ*1, p);
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canvas->drawTextBlob(fBlob, 0, kFontSZ*2, p);
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}
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static sk_sp<SkShader> make_shader(const SkMatrix& lm, const SkMatrix& outer_lm) {
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static constexpr SkISize kTileSize = { 30, 30 };
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auto surface = SkSurface::MakeRasterN32Premul(kTileSize.width(), kTileSize.height());
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SkPaint p;
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p.setColor(0xffffff00);
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surface->getCanvas()->drawPaint(p);
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p.setColor(0xff008000);
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surface->getCanvas()
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->drawRect({0, 0, kTileSize.width()*0.9f, kTileSize.height()*0.9f}, p);
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return surface->makeImageSnapshot()
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->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
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SkSamplingOptions(SkFilterMode::kLinear), &lm)
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->makeWithLocalMatrix(outer_lm);
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}
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inline static constexpr float kSZ = 300,
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kFontSZ = kSZ * 0.38,
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kScale = 1.4f;
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sk_sp<SkTextBlob> fBlob;
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};
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DEF_GM(return new RSXShaderGM;)
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