introduce Props to surface

gm/surface.cpp

+/*
+ * Copyright 2014 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 "SkGradientShader.h"
+#include "SkSurface.h"
+#include "SkSurfaceProps.h"
+
+#define W 200
+#define H 100
+

[robertphillips, 2014/09/19 18:25:36]

make_linear_gradient ?

[reed1, 2014/09/19 19:16:33]

hmm, not important to the caller, so I chose to keep it flexible.

+static SkShader* make_shader() {
+    int a = 0x99;
+    int b = 0xBB;
+    SkPoint pts[] = { { 0, 0 }, { W, H } };
+    SkColor colors[] = { SkColorSetRGB(a, a, a), SkColorSetRGB(b, b, b) };
+    return SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
+}
+
+static SkSurface* make_surface(GrContext* ctx, const SkImageInfo& info, SkPixelGeometry geo,
+                               int disallowAA, int disallowDither) {
+    uint32_t flags = 0;
+    if (disallowAA) {
+        flags |= SkSurfaceProps::kDisallowAntiAlias_Flag;
+    }
+    if (disallowDither) {
+        flags |= SkSurfaceProps::kDisallowDither_Flag;
+    }
+
+    SkSurfaceProps props(flags, geo);
+    if (ctx) {
+        return SkSurface::NewRenderTarget(ctx, info, 0, &props);
+    } else {
+        return SkSurface::NewRaster(info, &props);
+    }
+}
+
+static void test_draw(SkCanvas* canvas, const char label[]) {
+    SkPaint paint;
+
+    paint.setAntiAlias(true);
+    paint.setLCDRenderText(true);
+    paint.setDither(true);
+
+    paint.setShader(make_shader())->unref();
+    canvas->drawRect(SkRect::MakeWH(W, H), paint);
+    paint.setShader(NULL);
+
+    paint.setColor(SK_ColorWHITE);
+    paint.setTextSize(32);
+    paint.setTextAlign(SkPaint::kCenter_Align);
+    canvas->drawText(label, strlen(label), W / 2, H * 3 / 4, paint);
+}
+

[robertphillips, 2014/09/19 18:25:36]

// Exercise SkSurfaceProps variants. This renders a test scene for four
AA/dithering
// combinations (AA/Dither, AA/noDither, noAA/Dither, noAA/noDither) crossed
with
// 5 pixel geometry options.

?

[reed1, 2014/09/19 19:16:33]

Done.

+class SurfaceGM : public skiagm::GM {
+public:
+    SurfaceGM() {}
+
+protected:

[robertphillips, 2014/09/19 18:25:36]

SK_OVERRIDE(s) ?
virtual on onShortName ?

[reed1, 2014/09/19 19:16:33]

Done.

+    SkString onShortName() {
+        return SkString("surface");
+    }
+
+    virtual SkISize onISize() { return SkISize::Make(W * 4, H * 5); }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        GrContext* ctx = canvas->getGrContext();
+
+        // must be opaque to have a hope of testing LCD text
+        const SkImageInfo info = SkImageInfo::MakeN32(W, H, kOpaque_SkAlphaType);
+
+        const struct {
+            SkPixelGeometry fGeo;
+            const char*     fLabel;
+        } rec[] = {
+            { kUnknown_SkPixelGeometry, "Unknown" },
+            { kRGB_H_SkPixelGeometry,   "RGB_H" },
+            { kBGR_H_SkPixelGeometry,   "BGR_H" },
+            { kRGB_V_SkPixelGeometry,   "RGB_V" },
+            { kBGR_V_SkPixelGeometry,   "BGR_V" },
+        };
+    
+        SkScalar x = 0;
+        for (int disallowAA = 0; disallowAA <= 1; ++disallowAA) {
+            for (int disallowDither = 0; disallowDither <= 1; ++disallowDither) {
+                SkScalar y = 0;
+                for (size_t i = 0; i < SK_ARRAY_COUNT(rec); ++i) {
+                    SkAutoTUnref<SkSurface> surface(make_surface(ctx, info, rec[i].fGeo,
+                                                                 disallowAA, disallowDither));
+                    test_draw(surface->getCanvas(), rec[i].fLabel);
+                    surface->draw(canvas, x, y, NULL);
+                    y += H;
+                }
+                x += W;
+            }
+        }
+    }
+
+private:
+    typedef GM INHERITED;
+};
+
+DEF_GM( return new SurfaceGM )