dd5d46256d
git-svn-id: http://skia.googlecode.com/svn/trunk@9556 2bbb7eff-a529-9590-31e7-b0007b416f81
139 lines
3.8 KiB
C++
139 lines
3.8 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkCanvas.h"
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#include "SkColor.h"
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#include "SkGradientShader.h"
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#include "SkMatrix.h"
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#include "SkPaint.h"
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#include "SkPoint.h"
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#include "SkRect.h"
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#include "SkRefCnt.h"
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#include "SkScalar.h"
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#include "SkSize.h"
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#include "SkString.h"
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#include "gm.h"
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static const SkColor gColors[] = {
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SK_ColorRED, SK_ColorYELLOW
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};
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// these arrays define the gradient stop points
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// as x1, y1, x2, y2 per gradient to draw
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static const SkPoint linearPts[][2] = {
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{{0, 0}, {1, 0}},
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{{0, 0}, {0, 1}},
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{{1, 0}, {0, 0}},
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{{0, 1}, {0, 0}},
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{{0, 0}, {1, 1}},
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{{1, 1}, {0, 0}},
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{{1, 0}, {0, 1}},
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{{0, 1}, {1, 0}}
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};
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static const SkPoint radialPts[][2] = {
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{{0, 0.5f}, {1, 0.5f}},
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{{0.5, 0 }, {0.5, 1 }},
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{{1, 0.5f}, {0, 0.5f}},
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{{0.5f, 1 }, {0.5f, 0 }},
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{{0, 0}, {1, 1}},
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{{1, 1}, {0, 0}},
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{{1, 0}, {0, 1}},
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{{0, 1}, {1, 0}}
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};
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static const SkScalar TESTGRID_X = 200; // pixels allocated to each image in x dimension
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static const SkScalar TESTGRID_Y = 200; // pixels allocated to each image in y dimension
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static const int IMAGES_X = 4; // number of images per row
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static SkShader* make_linear_gradient(const SkPoint pts[2]) {
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return SkGradientShader::CreateLinear(pts, gColors, NULL, SK_ARRAY_COUNT(gColors),
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SkShader::kClamp_TileMode, NULL);
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}
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static SkShader* make_radial_gradient(const SkPoint pts[2]) {
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SkPoint center;
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center.set(SkScalarAve(pts[0].fX, pts[1].fX),
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SkScalarAve(pts[0].fY, pts[1].fY));
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float radius = (center - pts[0]).length();
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return SkGradientShader::CreateRadial(center, radius, gColors, NULL, SK_ARRAY_COUNT(gColors),
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SkShader::kClamp_TileMode, NULL);
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}
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static void draw_gradients(SkCanvas* canvas, SkShader* (*makeShader)(const SkPoint[2]),
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const SkPoint ptsArray[][2], int numImages) {
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// Use some nice prime numbers for the rectangle and matrix with
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// different scaling along the x and y axes (which is the bug this
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// test addresses, where incorrect order of operations mixed up the axes)
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SkRect rectGrad = { 43, 61, 181, 167 };
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SkMatrix shaderMat;
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shaderMat.setScale(rectGrad.width(), rectGrad.height());
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shaderMat.postTranslate(rectGrad.left(), rectGrad.top());
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canvas->save();
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for (int i = 0; i < numImages; i++) {
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// Advance line downwards if necessary.
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if (i % IMAGES_X == 0 && i != 0) {
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canvas->restore();
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canvas->translate(0, TESTGRID_Y);
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canvas->save();
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}
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// Setup shader and draw.
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SkAutoTUnref<SkShader> shader(makeShader(*ptsArray));
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shader->setLocalMatrix(shaderMat);
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SkPaint paint;
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paint.setShader(shader);
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canvas->drawRect(rectGrad, paint);
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// Advance to next position.
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canvas->translate(TESTGRID_X, 0);
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ptsArray++;
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}
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canvas->restore();
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}
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namespace skiagm {
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class GradientMatrixGM : public GM {
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public:
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GradientMatrixGM() {
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this->setBGColor(0xFFDDDDDD);
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}
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protected:
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SkString onShortName() SK_OVERRIDE {
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return SkString("gradient_matrix");
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}
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virtual SkISize onISize() SK_OVERRIDE {
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return SkISize::Make(800, 800);
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}
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virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
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draw_gradients(canvas, &make_linear_gradient,
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linearPts, SK_ARRAY_COUNT(linearPts));
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canvas->translate(0, TESTGRID_Y);
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draw_gradients(canvas, &make_radial_gradient,
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radialPts, SK_ARRAY_COUNT(radialPts));
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new GradientMatrixGM; )
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}
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