f49b429cef
the caller instantiates a light (distant, point or spot), and an SkDiffuseLightingFilter or SkSpecularLightingImageFilter with that light. A Sobel edge detection filter is applied to the alpha of the incoming bitmap, and the result is used as a height map for lighting calculations. Review URL: http://codereview.appspot.com/6302101/ git-svn-id: http://skia.googlecode.com/svn/trunk@4314 2bbb7eff-a529-9590-31e7-b0007b416f81
92 lines
3.5 KiB
C++
92 lines
3.5 KiB
C++
/*
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* Copyright 2012 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 "gm.h"
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#include "SkLightingImageFilter.h"
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#define WIDTH 330
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#define HEIGHT 220
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namespace skiagm {
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class ImageLightingGM : public GM {
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public:
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ImageLightingGM() : fInitialized(false) {
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this->setBGColor(0xFF000000);
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}
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protected:
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virtual SkString onShortName() {
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return SkString("lighting");
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}
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void make_bitmap() {
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fBitmap.setConfig(SkBitmap::kARGB_8888_Config, 100, 100);
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fBitmap.allocPixels();
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SkDevice device(fBitmap);
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SkCanvas canvas(&device);
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canvas.clear(0x00000000);
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setColor(0xFFFFFFFF);
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paint.setTextSize(SkIntToScalar(96));
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const char* str = "e";
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canvas.drawText(str, strlen(str), SkIntToScalar(20), SkIntToScalar(70), paint);
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}
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virtual SkISize onISize() {
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return make_isize(WIDTH, HEIGHT);
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}
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virtual void onDraw(SkCanvas* canvas) {
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if (!fInitialized) {
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make_bitmap();
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fInitialized = true;
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}
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SkPoint3 pointLocation(0, 0, SkIntToScalar(10));
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SkScalar azimuthRad = SkDegreesToRadians(SkIntToScalar(225));
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SkScalar elevationRad = SkDegreesToRadians(SkIntToScalar(5));
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SkPoint3 distantDirection(SkScalarMul(SkScalarCos(azimuthRad), SkScalarCos(elevationRad)),
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SkScalarMul(SkScalarSin(azimuthRad), SkScalarCos(elevationRad)),
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SkScalarSin(elevationRad));
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SkPoint3 spotLocation(SkIntToScalar(-10), SkIntToScalar(-10), SkIntToScalar(20));
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SkPoint3 spotTarget(SkIntToScalar(40), SkIntToScalar(40), 0);
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SkScalar spotExponent = SK_Scalar1;
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SkScalar cutoffAngle = SkIntToScalar(15);
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SkScalar kd = SkIntToScalar(2);
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SkScalar ks = SkIntToScalar(1);
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SkScalar shininess = SkIntToScalar(8);
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SkScalar surfaceScale = SkIntToScalar(1);
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SkColor white(0xFFFFFFFF);
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SkPaint paint;
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paint.setImageFilter(SkLightingImageFilter::CreatePointLitDiffuse(pointLocation, white, surfaceScale, kd))->unref();
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canvas->drawSprite(fBitmap, 0, 0, &paint);
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paint.setImageFilter(SkLightingImageFilter::CreateDistantLitDiffuse(distantDirection, white, surfaceScale, kd))->unref();
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canvas->drawSprite(fBitmap, 110, 0, &paint);
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paint.setImageFilter(SkLightingImageFilter::CreateSpotLitDiffuse(spotLocation, spotTarget, spotExponent, cutoffAngle, white, surfaceScale, kd))->unref();
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canvas->drawSprite(fBitmap, 220, 0, &paint);
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paint.setImageFilter(SkLightingImageFilter::CreatePointLitSpecular(pointLocation, white, surfaceScale, ks, shininess))->unref();
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canvas->drawSprite(fBitmap, 0, 110, &paint);
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paint.setImageFilter(SkLightingImageFilter::CreateDistantLitSpecular(distantDirection, white, surfaceScale, ks, shininess))->unref();
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canvas->drawSprite(fBitmap, 110, 110, &paint);
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paint.setImageFilter(SkLightingImageFilter::CreateSpotLitSpecular(spotLocation, spotTarget, spotExponent, cutoffAngle, white, surfaceScale, ks, shininess))->unref();
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canvas->drawSprite(fBitmap, 220, 110, &paint);
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}
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private:
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typedef GM INHERITED;
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SkBitmap fBitmap;
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bool fInitialized;
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};
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//////////////////////////////////////////////////////////////////////////////
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static GM* MyFactory(void*) { return new ImageLightingGM; }
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static GMRegistry reg(MyFactory);
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}
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