/* * Copyright 2015 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/SkCanvas.h" #include "include/core/SkColor.h" #include "include/core/SkFont.h" #include "include/core/SkFontTypes.h" #include "include/core/SkPaint.h" #include "include/core/SkRect.h" #include "include/core/SkRefCnt.h" #include "include/core/SkScalar.h" #include "include/core/SkSize.h" #include "include/core/SkString.h" #include "include/core/SkTextBlob.h" #include "include/core/SkTypeface.h" #include "tools/ToolUtils.h" #include namespace skiagm { class TextBlobTransforms : public GM { public: // This gm tests that textblobs can be translated, rotated, and scaled TextBlobTransforms() {} protected: void onOnceBeforeDraw() override { SkTextBlobBuilder builder; // make textblob. To stress distance fields, we choose sizes appropriately SkFont font(ToolUtils::create_portable_typeface(), 162); font.setEdging(SkFont::Edging::kAlias); const char* text = "A"; SkRect bounds; font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds); ToolUtils::add_to_text_blob(&builder, text, font, 0, 0); // Medium SkScalar xOffset = bounds.width() + 5; font.setSize(72); text = "B"; ToolUtils::add_to_text_blob(&builder, text, font, xOffset, 0); font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds); SkScalar yOffset = bounds.height(); // Small font.setSize(32); text = "C"; ToolUtils::add_to_text_blob(&builder, text, font, xOffset, -yOffset - 10); // build fBlob = builder.make(); } SkString onShortName() override { return SkString("textblobtransforms"); } SkISize onISize() override { return SkISize::Make(kWidth, kHeight); } void onDraw(SkCanvas* canvas) override { canvas->drawColor(SK_ColorGRAY); SkPaint paint; SkRect bounds = fBlob->bounds(); canvas->translate(20, 20); // Colors were chosen to map to pairs of canonical colors. The GPU Backend will cache A8 // Texture Blobs based on the canonical color they map to. Canonical colors are used to // create masks. For A8 there are 8 of them. //SkColor colors[] = {SK_ColorCYAN, SK_ColorLTGRAY, SK_ColorYELLOW, SK_ColorWHITE}; SkScalar xOffset = SkScalarCeilToScalar(bounds.width()); SkScalar yOffset = SkScalarCeilToScalar(bounds.height()); // first translate canvas->translate(xOffset, 2 * yOffset); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->translate(-xOffset, 0); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->translate(2 * xOffset, 0); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->translate(-xOffset, -yOffset); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->translate(0, 2 * yOffset); canvas->drawTextBlob(fBlob, 0, 0, paint); // now rotate canvas->translate(4 * xOffset, -yOffset); canvas->rotate(180.f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->rotate(-180.f); canvas->translate(0, -yOffset); canvas->rotate(-180.f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->rotate(270.f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->rotate(-90.f); canvas->translate(-xOffset, yOffset); canvas->rotate(-90.f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->rotate(90.f); // and scales canvas->translate(- 3 * xOffset, 3 * yOffset); canvas->scale(1.5f, 1.5f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->translate(xOffset, 0); canvas->scale(.25f, .25f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->translate(xOffset, 0); canvas->scale(3.f, 2.f); canvas->drawTextBlob(fBlob, 0, 0, paint); // finally rotates, scales, and translates together canvas->translate(xOffset, 0); canvas->rotate(23.f); canvas->scale(.33f, .5f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->rotate(-46.f); canvas->translate(xOffset, 0); canvas->scale(1.2f, 1.1f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->rotate(46.f); canvas->translate(xOffset, 0); canvas->scale(1.1f, 1.2f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->rotate(46.f); canvas->translate(xOffset, 0); canvas->scale(.95f, 1.1f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->rotate(46.f); canvas->translate(xOffset, 0); canvas->scale(1.3f, .7f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->rotate(46.f); canvas->translate(xOffset, 0); canvas->scale(.8f, 1.1f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->rotate(10.f); canvas->translate(xOffset, 0); canvas->scale(1.f, 5.f); canvas->drawTextBlob(fBlob, 0, 0, paint); canvas->rotate(5.f); canvas->translate(xOffset, 0); canvas->scale(5.f, 1.f); canvas->drawTextBlob(fBlob, 0, 0, paint); } private: sk_sp fBlob; static constexpr int kWidth = 1000; static constexpr int kHeight = 1200; typedef GM INHERITED; }; ////////////////////////////////////////////////////////////////////////////// DEF_GM(return new TextBlobTransforms;) } // namespace skiagm