diff options
author | reed@google.com <reed@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-05-24 14:58:44 +0000 |
---|---|---|
committer | reed@google.com <reed@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-05-24 14:58:44 +0000 |
commit | 3d3a860d0ba878adb905512a45c500a67532b0a3 (patch) | |
tree | 058727f849286e8a85c84387da244687b273346c /gm/alphagradients.cpp | |
parent | 8b79028d27653fafcde6901affba48b987b52e43 (diff) |
Add flag to gradients to interpolate colors in premul space. Experimental API to encapsulate the shared parameters for all gradients into a struct.
BUG=
R=bsalomon@google.com
Review URL: https://codereview.chromium.org/15893002
git-svn-id: http://skia.googlecode.com/svn/trunk@9273 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'gm/alphagradients.cpp')
-rw-r--r-- | gm/alphagradients.cpp | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/gm/alphagradients.cpp b/gm/alphagradients.cpp new file mode 100644 index 0000000000..d335a9d7e5 --- /dev/null +++ b/gm/alphagradients.cpp @@ -0,0 +1,82 @@ +/* + * Copyright 2013 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 "SkCanvas.h" +#include "SkGradientShader.h" + +class AlphaGradientsGM : public skiagm::GM { +public: + AlphaGradientsGM() {} + +protected: + virtual SkString onShortName() SK_OVERRIDE { + return SkString("alphagradients"); + } + + virtual SkISize onISize() SK_OVERRIDE { + return SkISize::Make(640, 480); + } + + static void draw_grad(SkCanvas* canvas, const SkRect& r, + SkColor c0, SkColor c1, bool doPreMul) { + SkColor colors[] = { c0, c1 }; + SkPoint pts[] = { { r.fLeft, r.fTop }, { r.fRight, r.fBottom } }; + SkPaint paint; + uint32_t flags = doPreMul ? SkGradientShader::kInterpolateColorsInPremul_Flag : 0; + SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL, 2, + SkShader::kClamp_TileMode, + NULL, flags); + paint.setShader(s)->unref(); + canvas->drawRect(r, paint); + + paint.setShader(NULL); + paint.setStyle(SkPaint::kStroke_Style); + canvas->drawRect(r, paint); + } + + virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { + static const struct { + SkColor fColor0; + SkColor fColor1; + } gRec[] = { + { 0xFFFFFFFF, 0x00000000 }, + { 0xFFFFFFFF, 0x00FF0000 }, + { 0xFFFFFFFF, 0x00FFFF00 }, + { 0xFFFFFFFF, 0x00FFFFFF }, + { 0xFFFF0000, 0x00000000 }, + { 0xFFFF0000, 0x00FF0000 }, + { 0xFFFF0000, 0x00FFFF00 }, + { 0xFFFF0000, 0x00FFFFFF }, + { 0xFF0000FF, 0x00000000 }, + { 0xFF0000FF, 0x00FF0000 }, + { 0xFF0000FF, 0x00FFFF00 }, + { 0xFF0000FF, 0x00FFFFFF }, + }; + + SkRect r = SkRect::MakeWH(300, 30); + + canvas->translate(10, 10); + + for (int doPreMul = 0; doPreMul <= 1; ++doPreMul) { + canvas->save(); + for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) { + draw_grad(canvas, r, gRec[i].fColor0, gRec[i].fColor1, SkToBool(doPreMul)); + canvas->translate(0, r.height() + 8); + } + canvas->restore(); + canvas->translate(r.width() + 10, 0); + } + } + + virtual uint32_t onGetFlags() const { return kSkipPipe_Flag; } + +private: + typedef skiagm::GM INHERITED; +}; + +DEF_GM( return SkNEW(AlphaGradientsGM); ) |