87 lines
3.0 KiB
C++
87 lines
3.0 KiB
C++
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// Copyright 2020 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#include "tools/fiddle/examples.h"
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REG_FIDDLE(skpaint_xfer, 576, 640, false, 0) {
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static void draw_utf8_string(SkCanvas* c, const char* t, SkScalar x, SkScalar y,
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const SkFont& f, const SkPaint& p) {
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c->drawTextBlob(SkTextBlob::MakeFromString(t, f).get(), x, y, p);
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}
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void draw(SkCanvas* canvas) {
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SkBlendMode modes[] = {
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SkBlendMode::kClear,
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SkBlendMode::kSrc,
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SkBlendMode::kDst,
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SkBlendMode::kSrcOver,
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SkBlendMode::kDstOver,
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SkBlendMode::kSrcIn,
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SkBlendMode::kDstIn,
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SkBlendMode::kSrcOut,
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SkBlendMode::kDstOut,
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SkBlendMode::kSrcATop,
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SkBlendMode::kDstATop,
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SkBlendMode::kXor,
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SkBlendMode::kPlus,
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SkBlendMode::kModulate,
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SkBlendMode::kScreen,
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SkBlendMode::kOverlay,
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SkBlendMode::kDarken,
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SkBlendMode::kLighten,
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SkBlendMode::kColorDodge,
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SkBlendMode::kColorBurn,
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SkBlendMode::kHardLight,
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SkBlendMode::kSoftLight,
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SkBlendMode::kDifference,
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SkBlendMode::kExclusion,
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SkBlendMode::kMultiply,
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SkBlendMode::kHue,
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SkBlendMode::kSaturation,
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SkBlendMode::kColor,
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SkBlendMode::kLuminosity,
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};
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SkRect rect = SkRect::MakeWH(64.0f, 64.0f);
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SkPaint stroke, src, dst;
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stroke.setStyle(SkPaint::kStroke_Style);
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SkFont font(nullptr, 24);
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SkPoint srcPoints[2] = {
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SkPoint::Make(0.0f, 0.0f),
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SkPoint::Make(64.0f, 0.0f)
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};
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SkColor srcColors[2] = {
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SK_ColorMAGENTA & 0x00FFFFFF,
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SK_ColorMAGENTA};
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src.setShader(SkGradientShader::MakeLinear(
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srcPoints, srcColors, nullptr, 2,
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SkTileMode::kClamp, 0, nullptr));
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SkPoint dstPoints[2] = {
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SkPoint::Make(0.0f, 0.0f),
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SkPoint::Make(0.0f, 64.0f)
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};
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SkColor dstColors[2] = {
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SK_ColorCYAN & 0x00FFFFFF,
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SK_ColorCYAN};
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dst.setShader(SkGradientShader::MakeLinear(
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dstPoints, dstColors, nullptr, 2,
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SkTileMode::kClamp, 0, nullptr));
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canvas->clear(SK_ColorWHITE);
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size_t N = sizeof(modes) / sizeof(modes[0]);
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size_t K = (N - 1) / 3 + 1;
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SkASSERT(K * 64 == 640); // tall enough
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for (size_t i = 0; i < N; ++i) {
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SkAutoCanvasRestore autoCanvasRestore(canvas, true);
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canvas->translate(192.0f * (i / K), 64.0f * (i % K));
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const char* desc = SkBlendMode_Name(modes[i]);
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draw_utf8_string(canvas, desc, 68.0f, 30.0f, font, SkPaint());
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canvas->clipRect(SkRect::MakeWH(64.0f, 64.0f));
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canvas->drawColor(SK_ColorLTGRAY);
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(void)canvas->saveLayer(nullptr, nullptr);
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canvas->clear(SK_ColorTRANSPARENT);
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canvas->drawPaint(dst);
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src.setBlendMode(modes[i]);
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canvas->drawPaint(src);
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canvas->drawRect(rect, stroke);
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}
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}
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} // END FIDDLE
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