| /* |
| * 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 <string.h> |
| |
| 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), kUTF8_SkTextEncoding, &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), kUTF8_SkTextEncoding, &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<SkTextBlob> fBlob; |
| |
| static constexpr int kWidth = 1000; |
| static constexpr int kHeight = 1200; |
| |
| typedef GM INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM(return new TextBlobTransforms;) |
| } |