skia2/docs/examples/Modulate.cpp
Mike Klein c0bd9f9fe5 rewrite includes to not need so much -Ifoo
Current strategy: everything from the top

Things to look at first are the manual changes:

   - added tools/rewrite_includes.py
   - removed -Idirectives from BUILD.gn
   - various compile.sh simplifications
   - tweak tools/embed_resources.py
   - update gn/find_headers.py to write paths from the top
   - update gn/gn_to_bp.py SkUserConfig.h layout
     so that #include "include/config/SkUserConfig.h" always
     gets the header we want.

No-Presubmit: true
Change-Id: I73a4b181654e0e38d229bc456c0d0854bae3363e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209706
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
2019-04-24 16:27:11 +00:00

30 lines
1.3 KiB
C++

// Copyright 2019 Google LLC.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
#include "tools/fiddle/examples.h"
// HASH=3fdac2b2f48bd227d2e74234c260bc8e
REG_FIDDLE(Modulate, 256, 256, false, 0) {
void draw(SkCanvas* canvas) {
auto drawSquare = [=](int dx, int dy, SkBlendMode mode, const char* label) -> void {
const SkColor colors[] = { SK_ColorBLACK, SK_ColorWHITE };
const SkPoint horz[] = { { 0, 0 }, { 128, 0 } };
SkPaint paint;
paint.setShader(SkGradientShader::MakeLinear(horz, colors, nullptr, SK_ARRAY_COUNT(colors),
SkTileMode::kClamp));
paint.setBlendMode(mode);
canvas->translate(dx, dy);
canvas->drawRect({0, 0, 128, 128}, paint);
paint.setBlendMode(SkBlendMode::kXor);
SkFont font;
canvas->drawString(label, 40, 100, font, paint);
};
drawSquare(0, 0, SkBlendMode::kSrc, "destination");
drawSquare(128, 0, SkBlendMode::kSrc, "");
drawSquare(0, 128, SkBlendMode::kSrc, "");
canvas->translate(-128, -128);
canvas->rotate(90, 0, 128);
drawSquare(0, 0, SkBlendMode::kSrc, "source");
drawSquare(0, -128, SkBlendMode::kModulate, "modulate");
drawSquare(-128, 0, SkBlendMode::kMultiply, "multiply");
}
} // END FIDDLE