Implement SkColorFilter::asColorMatrix() virtual, and override in

SkColorMatrixFilter.  Implement missing SkColorMatrixFilter::setMatrix() and
setArray() functions (were in .h, just not implemented).  Add a gm for color
matrix filters.

Review URL:  http://codereview.appspot.com/5500044/



git-svn-id: http://skia.googlecode.com/svn/trunk@2909 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 104 insertions, 0 deletions

diff --git a/gm/colormatrix.cpp b/gm/colormatrix.cpp
new file mode 100644
index 0000000000..2c6e44c1f2
--- /dev/null
+++ b/gm/colormatrix.cpp
@@ -0,0 +1,104 @@
+/*
+ * Copyright 2011 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 "SkColorMatrixFilter.h"
+
+#define WIDTH 500
+#define HEIGHT 500
+
+namespace skiagm {
+
+class ColorMatrixGM : public GM {
+public:
+    ColorMatrixGM() {
+        this->setBGColor(0xFF808080);
+        fBitmap = createBitmap(64, 64);
+    }
+    
+protected:
+    virtual SkString onShortName() {
+        return SkString("colormatrix");
+    }
+
+    virtual SkISize onISize() {
+        return make_isize(WIDTH, HEIGHT);
+    }
+
+    SkBitmap createBitmap(int width, int height) {
+        SkBitmap bm;
+        bm.setConfig(SkBitmap::kARGB_8888_Config, width, height);
+        bm.allocPixels();
+        SkCanvas canvas(bm);
+        for (int y = 0; y < height; ++y) {
+            for (int x = 0; x < width; ++x) {
+                SkPaint paint;
+                paint.setColor(SkColorSetARGB(255, x * 255 / width, y * 255 / height, 0));
+                canvas.drawRect(SkRect::MakeXYWH(x, y, 1, 1), paint);
+            }
+        }
+        return bm;
+    }
+    virtual void onDraw(SkCanvas* canvas) {
+
+        SkPaint paint;
+        SkColorMatrix matrix;
+        SkColorMatrixFilter* filter = new SkColorMatrixFilter();
+        paint.setColorFilter(filter)->unref();
+
+        matrix.setIdentity();
+        filter->setMatrix(matrix);
+        canvas->drawBitmap(fBitmap, 0, 0, &paint);
+
+        matrix.setRotate(SkColorMatrix::kR_Axis, 90);
+        filter->setMatrix(matrix);
+        canvas->drawBitmap(fBitmap, 80, 0, &paint);
+
+        matrix.setRotate(SkColorMatrix::kG_Axis, 90);
+        filter->setMatrix(matrix);
+        canvas->drawBitmap(fBitmap, 160, 0, &paint);
+
+        matrix.setRotate(SkColorMatrix::kB_Axis, 90);
+        filter->setMatrix(matrix);
+        canvas->drawBitmap(fBitmap, 240, 0, &paint);
+
+        matrix.setSaturation(SkFloatToScalar(0.0f));
+        filter->setMatrix(matrix);
+        canvas->drawBitmap(fBitmap, 0, 80, &paint);
+
+        matrix.setSaturation(SkFloatToScalar(0.5f));
+        filter->setMatrix(matrix);
+        canvas->drawBitmap(fBitmap, 80, 80, &paint);
+
+        matrix.setSaturation(SkFloatToScalar(1.0f));
+        filter->setMatrix(matrix);
+        canvas->drawBitmap(fBitmap, 160, 80, &paint);
+
+        matrix.setSaturation(SkFloatToScalar(2.0f));
+        filter->setMatrix(matrix);
+        canvas->drawBitmap(fBitmap, 240, 80, &paint);
+
+        matrix.setRGB2YUV();
+        filter->setMatrix(matrix);
+        canvas->drawBitmap(fBitmap, 0, 160, &paint);
+
+        matrix.setYUV2RGB();
+        filter->setMatrix(matrix);
+        canvas->drawBitmap(fBitmap, 80, 160, &paint);
+    }
+    
+private:
+    SkBitmap fBitmap;
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new ColorMatrixGM; }
+static GMRegistry reg(MyFactory);
+
+}