blob: cc1683e08939a197b9c0f246031faba68c8d700d [file] [log] [blame]
/*
* 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 "SkCanvas.h"
#include "SkColor.h"
#include "SkGradientShader.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkPoint.h"
#include "SkRect.h"
#include "SkRefCnt.h"
#include "SkScalar.h"
#include "SkSize.h"
#include "SkString.h"
#include "gm.h"
static const SkColor gColors[] = {
SK_ColorRED, SK_ColorYELLOW
};
// these arrays define the gradient stop points
// as x1, y1, x2, y2 per gradient to draw
static const SkPoint linearPts[][2] = {
{{0, 0}, {1, 0}},
{{0, 0}, {0, 1}},
{{1, 0}, {0, 0}},
{{0, 1}, {0, 0}},
{{0, 0}, {1, 1}},
{{1, 1}, {0, 0}},
{{1, 0}, {0, 1}},
{{0, 1}, {1, 0}}
};
static const SkScalar TESTGRID_X = 200; // pixels allocated to each image in x dimension
static const SkScalar TESTGRID_Y = 200; // pixels allocated to each image in y dimension
static const int IMAGES_X = 4; // number of images per row
static SkShader* make_linear_gradient(const SkPoint pts[2]) {
return SkGradientShader::CreateLinear(pts, gColors, NULL, SK_ARRAY_COUNT(gColors),
SkShader::kClamp_TileMode, NULL);
}
static void draw_gradients(SkCanvas* canvas, SkShader* (*makeShader)(const SkPoint[2]),
const SkPoint ptsArray[][2], int numImages) {
// Use some nice prime numbers for the rectangle and matrix with
// different scaling along the x and y axes (which is the bug this
// test addresses, where incorrect order of operations mixed up the axes)
SkRect rectGrad = { 43, 61, 181, 167 };
SkMatrix shaderMat;
shaderMat.setScale(rectGrad.width(), rectGrad.height());
shaderMat.postTranslate(rectGrad.left(), rectGrad.top());
canvas->save();
for (int i = 0; i < numImages; i++) {
// Advance line downwards if necessary.
if (i % IMAGES_X == 0 && i != 0) {
canvas->restore();
canvas->translate(0, TESTGRID_Y);
canvas->save();
}
// Setup shader and draw.
SkAutoTUnref<SkShader> shader(makeShader(*ptsArray));
shader->setLocalMatrix(shaderMat);
SkPaint paint;
paint.setShader(shader);
canvas->drawRect(rectGrad, paint);
// Advance to next position.
canvas->translate(TESTGRID_X, 0);
ptsArray++;
}
canvas->restore();
}
namespace skiagm {
class GradientMatrixGM : public GM {
public:
GradientMatrixGM() {
this->setBGColor(0xFFDDDDDD);
}
protected:
SkString onShortName() SK_OVERRIDE {
return SkString("gradient_matrix");
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(800, 800);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
draw_gradients(canvas, &make_linear_gradient,
linearPts, SK_ARRAY_COUNT(linearPts));
}
private:
typedef GM INHERITED;
};
DEF_GM( return new GradientMatrixGM; )
}