skia2/gm/localmatriximageshader.cpp
Mike Reed 46596ae505 use tool_utils to encapsulate checking for recording canvas and makeSurface
Bug: skia:
Change-Id: Ia93ee09dd213b8d6ad5c18e887add5ff3448c824
Reviewed-on: https://skia-review.googlesource.com/90243
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2018-01-02 21:06:41 +00:00

57 lines
2.1 KiB
C++

/*
* 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 "SkCanvas.h"
#include "SkSurface.h"
#include "sk_tool_utils.h"
static sk_sp<SkImage> make_image(SkCanvas* rootCanvas, SkColor color) {
SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
auto surface(sk_tool_utils::makeSurface(rootCanvas, info));
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(color);
surface->getCanvas()->drawIRect(SkIRect::MakeXYWH(25, 25, 50, 50), paint);
return surface->makeImageSnapshot();
}
DEF_SIMPLE_GM(localmatriximageshader, canvas, 250, 250) {
sk_sp<SkImage> redImage = make_image(canvas, SK_ColorRED);
SkMatrix translate = SkMatrix::MakeTrans(100.0f, 0.0f);
SkMatrix rotate;
rotate.setRotate(45.0f);
sk_sp<SkShader> redImageShader = redImage->makeShader(&translate);
sk_sp<SkShader> redLocalMatrixShader = redImageShader->makeWithLocalMatrix(rotate);
// Rotate about the origin will happen first.
SkPaint paint;
paint.setShader(redLocalMatrixShader);
canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
sk_sp<SkImage> blueImage = make_image(canvas, SK_ColorBLUE);
sk_sp<SkShader> blueImageShader = blueImage->makeShader(&rotate);
sk_sp<SkShader> blueLocalMatrixShader = blueImageShader->makeWithLocalMatrix(translate);
// Translate will happen first.
paint.setShader(blueLocalMatrixShader);
canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
canvas->translate(100.0f, 0.0f);
// Use isAImage() and confirm that the shaders will draw exactly the same (to the right by 100).
SkShader::TileMode mode[2];
SkMatrix matrix;
SkImage* image = redLocalMatrixShader->isAImage(&matrix, mode);
paint.setShader(image->makeShader(mode[0], mode[1], &matrix));
canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
image = blueLocalMatrixShader->isAImage(&matrix, mode);
paint.setShader(image->makeShader(mode[0], mode[1], &matrix));
canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
}