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/*
* 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.h"
#include "Resources.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkStream.h"
#include "SkTextBlob.h"
#include "SkTypeface.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
SkPaint paint;
paint.setTextSize(162);
const char* text = "A";
sk_tool_utils::set_portable_typeface(&paint);
SkRect bounds;
paint.measureText(text, strlen(text), &bounds);
sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, 0);
// Medium
SkScalar xOffset = bounds.width() + 5;
paint.setTextSize(72);
text = "B";
sk_tool_utils::add_to_text_blob(&builder, text, paint, xOffset, 0);
paint.measureText(text, strlen(text), &bounds);
SkScalar yOffset = bounds.height();
// Small
paint.setTextSize(32);
text = "C";
sk_tool_utils::add_to_text_blob(&builder, text, paint, 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_tool_utils::color_to_565(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_tool_utils::color_to_565(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;)
}
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