android/apps: Add CanvasProof App;

platform_tools/android/apps/canvasproof/src/main/jni/org_skia_canvasproof_GaneshPictureRenderer.cpp

Index: platform_tools/android/apps/canvasproof/src/main/jni/org_skia_canvasproof_GaneshPictureRenderer.cpp
diff --git a/platform_tools/android/apps/canvasproof/src/main/jni/org_skia_canvasproof_GaneshPictureRenderer.cpp b/platform_tools/android/apps/canvasproof/src/main/jni/org_skia_canvasproof_GaneshPictureRenderer.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d1de529674104e39e6853e53c9d50c6e50e2ac84
--- /dev/null
+++ b/platform_tools/android/apps/canvasproof/src/main/jni/org_skia_canvasproof_GaneshPictureRenderer.cpp
@@ -0,0 +1,146 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "org_skia_canvasproof_GaneshPictureRenderer.h"
+
+#include "GrContext.h"
+#include "JavaInputStream.h"
+#include "SkCanvas.h"
+#include "SkMatrix.h"
+#include "SkPicture.h"
+#include "SkRect.h"
+#include "SkStream.h"
+#include "SkSurface.h"
+
+#define TAG "GaneshPictureRenderer.cpp: "
+
+static void render_picture(GrContext* grContext,
+                           int width,
+                           int height,
+                           const SkPicture* picture,
+                           const SkMatrix& matrix) {
+    SkASSERT(grContext);
+    if (!picture) {
+        SkDebugf(TAG "!picture\n");
+        return;
+    }
+    // Render to the default framebuffer render target.
+    GrBackendRenderTargetDesc desc;
+    desc.fWidth = width;
+    desc.fHeight = height;
+    desc.fConfig = kSkia8888_GrPixelConfig;
+    desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
+    SkSurfaceProps surfaceProps(SkSurfaceProps::kUseDeviceIndependentFonts_Flag,
+                                kUnknown_SkPixelGeometry);
+    // TODO:  Check to see if we can keep the surface between draw calls.
+    SkAutoTUnref<SkSurface> surface(
+            SkSurface::NewFromBackendRenderTarget(
+                    grContext, desc, &surfaceProps));
+    if (surface) {
+        SkCanvas* canvas = surface->getCanvas();
+        SkASSERT(canvas);
+        canvas->clear(SK_ColorGRAY);
+        canvas->concat(matrix);
+        SkRect cullRect = picture->cullRect();
+        canvas->clipRect(cullRect);
+        picture->playback(canvas);
+        canvas->flush();
+    }
+}
+
+namespace {
+struct GaneshPictureRendererImpl {
+    SkAutoTUnref<GrContext> fGrContext;
+    void render(int w, int h, const SkPicture* p, const SkMatrix& m) {
+        if (!fGrContext) {
+            // Cache the rendering context between frames.
+            fGrContext.reset(GrContext::Create(kOpenGL_GrBackend, 0));
+            if (!fGrContext) {
+                SkDebugf(TAG "GrContext::Create - failed\n");
+                return;
+            }
+        }
+        render_picture(fGrContext, w, h, p, m);
+    }
+};
+}  // namespace
+
+/*
+ * Class:     org_skia_canvasproof_GaneshPictureRenderer
+ * Method:    DrawThisFrame
+ * Signature: (IIFJ)V
+ */
+JNIEXPORT void JNICALL Java_org_skia_canvasproof_GaneshPictureRenderer_DrawThisFrame(
+        JNIEnv*, jclass, jint width, jint height, jfloat scale, jlong ptr, jlong pic) {
+    if (!ptr) { return; }
+    SkMatrix matrix = SkMatrix::MakeScale((SkScalar)scale);
+    GaneshPictureRendererImpl* impl =
+        reinterpret_cast<GaneshPictureRendererImpl*>(ptr);
+    SkPicture* picture = reinterpret_cast<SkPicture*>(pic);
+    impl->render((int)width, (int)height, picture, matrix);
+}
+
+/*
+ * Class:     org_skia_canvasproof_GaneshPictureRenderer
+ * Method:    Ctor
+ * Signature: ()J
+ */
+JNIEXPORT jlong JNICALL Java_org_skia_canvasproof_GaneshPictureRenderer_Ctor
+  (JNIEnv *, jclass) {
+    return reinterpret_cast<jlong>(new GaneshPictureRendererImpl);
+}
+
+/*
+ * Class:     org_skia_canvasproof_GaneshPictureRenderer
+ * Method:    CleanUp
+ * Signature: (J)V
+ */
+JNIEXPORT void JNICALL Java_org_skia_canvasproof_GaneshPictureRenderer_CleanUp
+  (JNIEnv *, jclass, jlong ptr) {
+    delete reinterpret_cast<GaneshPictureRendererImpl*>(ptr);
+}
+
+namespace {
+struct AndroidRectHelper {
+    jfieldID fLeft, fTop, fRight, fBottom;
+    AndroidRectHelper()
+        : fLeft(nullptr), fTop(nullptr), fRight(nullptr), fBottom(nullptr) {}
+    void config(JNIEnv *env) {
+        if (!fLeft) {
+            jclass rectClass = env->FindClass("android/graphics/Rect");
+            SkASSERT(rectClass);
+            fLeft = env->GetFieldID(rectClass, "left", "I");
+            fTop = env->GetFieldID(rectClass, "top", "I");
+            fRight = env->GetFieldID(rectClass, "right", "I");
+            fBottom = env->GetFieldID(rectClass, "bottom", "I");
+        }
+    }
+};
+} // namespace
+
+/*
+ * Class:     org_skia_canvasproof_GaneshPictureRenderer
+ * Method:    GetCullRect
+ * Signature: (Landroid/graphics/Rect;J)V
+ */
+JNIEXPORT void JNICALL Java_org_skia_canvasproof_GaneshPictureRenderer_GetCullRect
+  (JNIEnv *env, jclass, jobject androidGraphicsRect, jlong picturePtr) {
+    SkASSERT(androidGraphicsRect);
+    const SkPicture* picture = reinterpret_cast<SkPicture*>(picturePtr);
+    SkRect rect = SkRect::MakeEmpty();
+    if (picture) {
+        rect = picture->cullRect();
+    }
+    SkIRect iRect;
+    rect.roundOut(&iRect);
+    static AndroidRectHelper help;
+    help.config(env);
+    env->SetIntField(androidGraphicsRect, help.fLeft, (jint)(iRect.left()));
+    env->SetIntField(androidGraphicsRect, help.fTop, (jint)(iRect.top()));
+    env->SetIntField(androidGraphicsRect, help.fRight, (jint)(iRect.right()));
+    env->SetIntField(androidGraphicsRect, help.fBottom, (jint)(iRect.bottom()));
+}