| /* |
| * Copyright 2017 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" |
| |
| #if SK_SUPPORT_ATLAS_TEXT |
| #include "GrContext.h" |
| |
| #include "SkAtlasTextContext.h" |
| #include "SkAtlasTextFont.h" |
| #include "SkAtlasTextTarget.h" |
| #include "SkBitmap.h" |
| #include "SkCanvas.h" |
| #include "SkFont.h" |
| #include "SkTypeface.h" |
| #include "SkUTF.h" |
| #include "ToolUtils.h" |
| #include "gpu/TestContext.h" |
| #include "gpu/atlastext/GLTestAtlasTextRenderer.h" |
| #include "gpu/atlastext/TestAtlasTextRenderer.h" |
| |
| // GM that draws text using the Atlas Text interface offscreen and then blits that to the canvas. |
| |
| static SkScalar draw_string(SkAtlasTextTarget* target, const SkString& text, SkScalar x, SkScalar y, |
| uint32_t color, sk_sp<SkTypeface> typeface, float size) { |
| if (!text.size()) { |
| return x; |
| } |
| auto atlas_font = SkAtlasTextFont::Make(typeface, size); |
| int cnt = SkUTF::CountUTF8(text.c_str(), text.size()); |
| std::unique_ptr<SkGlyphID[]> glyphs(new SkGlyphID[cnt]); |
| typeface->charsToGlyphs(text.c_str(), SkTypeface::Encoding::kUTF8_Encoding, glyphs.get(), cnt); |
| |
| // Using a paint to get the positions for each glyph. |
| SkFont font; |
| font.setSize(size); |
| font.setTypeface(std::move(typeface)); |
| std::unique_ptr<SkScalar[]> widths(new SkScalar[cnt]); |
| font.getWidths(glyphs.get(), cnt, widths.get()); |
| |
| std::unique_ptr<SkPoint[]> positions(new SkPoint[cnt]); |
| positions[0] = {x, y}; |
| for (int i = 1; i < cnt; ++i) { |
| positions[i] = {positions[i - 1].fX + widths[i - 1], y}; |
| } |
| |
| target->drawText(glyphs.get(), positions.get(), cnt, color, *atlas_font); |
| |
| // Return the width of the of draw. |
| return positions[cnt - 1].fX + widths[cnt - 1] - positions[0].fX; |
| } |
| |
| class AtlasTextGM : public skiagm::GM { |
| public: |
| AtlasTextGM() = default; |
| |
| protected: |
| SkString onShortName() override { return SkString("atlastext"); } |
| |
| SkISize onISize() override { return SkISize::Make(kSize, kSize); } |
| |
| void onOnceBeforeDraw() override { |
| fRenderer = sk_gpu_test::MakeGLTestAtlasTextRenderer(); |
| if (!fRenderer) { |
| return; |
| } |
| fContext = SkAtlasTextContext::Make(fRenderer); |
| auto targetHandle = fRenderer->makeTargetHandle(kSize, kSize); |
| if (!targetHandle) { |
| return; |
| } |
| |
| fTarget = SkAtlasTextTarget::Make(fContext, kSize, kSize, targetHandle); |
| |
| fTypefaces[0] = ToolUtils::create_portable_typeface("serif", SkFontStyle::Italic()); |
| fTypefaces[1] = ToolUtils::create_portable_typeface("sans-serif", SkFontStyle::Italic()); |
| fTypefaces[2] = ToolUtils::create_portable_typeface("serif", SkFontStyle::Normal()); |
| fTypefaces[3] = ToolUtils::create_portable_typeface("sans-serif", SkFontStyle::Normal()); |
| fTypefaces[4] = ToolUtils::create_portable_typeface("serif", SkFontStyle::Bold()); |
| fTypefaces[5] = ToolUtils::create_portable_typeface("sans-serif", SkFontStyle::Bold()); |
| } |
| |
| DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override { |
| if (!fRenderer || !fTarget || !fTarget->handle()) { |
| *errorMsg = "No renderer and/or target."; |
| return DrawResult::kFail; |
| } |
| fRenderer->clearTarget(fTarget->handle(), 0xFF808080); |
| auto bmp = this->drawText(); |
| SkPaint paint; |
| paint.setBlendMode(SkBlendMode::kSrc); |
| canvas->drawBitmap(bmp, 0, 0); |
| return DrawResult::kOk; |
| } |
| |
| private: |
| SkBitmap drawText() { |
| static const int kSizes[] = {8, 13, 18, 23, 30}; |
| |
| static const SkString kTexts[] = {SkString("ABCDEFGHIJKLMNOPQRSTUVWXYZ"), |
| SkString("abcdefghijklmnopqrstuvwxyz"), |
| SkString("0123456789"), |
| SkString("!@#$%^&*()<>[]{}")}; |
| SkScalar x = 0; |
| SkScalar y = 10; |
| |
| SkRandom random; |
| do { |
| for (auto s : kSizes) { |
| auto size = 2 * s; |
| for (const auto& typeface : fTypefaces) { |
| for (const auto& text : kTexts) { |
| // Choose a random color but don't let alpha be too small to see. |
| uint32_t color = random.nextU() | 0x40000000; |
| fTarget->save(); |
| // Randomly add a little bit of perspective |
| if (random.nextBool()) { |
| SkMatrix persp; |
| persp.reset(); |
| persp.setPerspY(0.0005f); |
| persp.preTranslate(-x, -y + s); |
| persp.postTranslate(x, y - s); |
| fTarget->concat(persp); |
| } |
| // Randomly switch between positioning with a matrix vs x, y passed to draw. |
| SkScalar drawX = x, drawY = y; |
| if (random.nextBool()) { |
| fTarget->translate(x, y); |
| drawX = drawY = 0; |
| } |
| x += size + |
| draw_string(fTarget.get(), text, drawX, drawY, color, typeface, size); |
| x = SkScalarCeilToScalar(x); |
| fTarget->restore(); |
| // Flush periodically to test continued drawing after a flush. |
| if ((random.nextU() % 8) == 0) { |
| fTarget->flush(); |
| } |
| if (x + 100 > kSize) { |
| x = 0; |
| y += SkScalarCeilToScalar(size + 3); |
| if (y > kSize) { |
| fTarget->flush(); |
| return fRenderer->readTargetHandle(fTarget->handle()); |
| } |
| } |
| } |
| } |
| } |
| } while (true); |
| } |
| |
| static constexpr int kSize = 1280; |
| |
| sk_sp<SkTypeface> fTypefaces[6]; |
| sk_sp<sk_gpu_test::TestAtlasTextRenderer> fRenderer; |
| std::unique_ptr<SkAtlasTextTarget> fTarget; |
| sk_sp<SkAtlasTextContext> fContext; |
| |
| typedef GM INHERITED; |
| }; |
| |
| constexpr int AtlasTextGM::kSize; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM(return new AtlasTextGM;) |
| |
| #endif |