Adding support to trunk for building Skia using the Android NDK.

This CL depends on a subsequent CL to add the appropriate NDK
toolchain and system sources to the skia repo.

Review URL: http://codereview.appspot.com/5306089/
Review URL: http://codereview.appspot.com/5306089

git-svn-id: http://skia.googlecode.com/svn/trunk@2592 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 375 insertions, 0 deletions

diff --git a/samplecode/SampleApp_android.cpp b/samplecode/SampleApp_android.cpp
new file mode 100644
index 0000000000..eafd76d046
--- /dev/null
+++ b/samplecode/SampleApp_android.cpp
@@ -0,0 +1,375 @@
+
+/*
+ * Copyright 2011 Skia
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#include "GrContext.h"
+#include "GrGLInterface.h"
+#include "SampleApp.h"
+#include "SkApplication.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+#include "SkEvent.h"
+#include "SkGpuCanvas.h"
+#include "SkWindow.h"
+
+#include <jni.h>
+#include "android/AndroidKeyToSkKey.h"
+
+
+///////////////////////////////////////////
+///////////////// Globals /////////////////
+///////////////////////////////////////////
+
+struct ActivityGlue {
+    JNIEnv* m_env;
+    jweak m_obj;
+    jmethodID m_setTitle;
+    jmethodID m_startTimer;
+    jmethodID m_addToDownloads;
+    ActivityGlue() {
+        m_env = NULL;
+        m_obj = NULL;
+        m_setTitle = NULL;
+        m_startTimer = NULL;
+        m_addToDownloads = NULL;
+    }
+} gActivityGlue;
+
+struct WindowGlue {
+    jweak m_obj;
+    jmethodID m_inval;
+    jmethodID m_queueSkEvent;
+    WindowGlue() {
+        m_obj = NULL;
+        m_inval = NULL;
+        m_queueSkEvent = NULL;
+    }
+} gWindowGlue;
+
+SampleWindow* gWindow;
+
+///////////////////////////////////////////
+///////////// SkOSWindow impl /////////////
+///////////////////////////////////////////
+
+void SkOSWindow::onSetTitle(const char title[])
+{
+    if (gActivityGlue.m_env) {
+        JNIEnv* env = gActivityGlue.m_env;
+        jstring string = env->NewStringUTF(title);
+        env->CallVoidMethod(gActivityGlue.m_obj, gActivityGlue.m_setTitle,
+                string);
+        env->DeleteLocalRef(string);
+    }
+}
+
+void SkOSWindow::onHandleInval(const SkIRect& rect)
+{
+    if (!gActivityGlue.m_env || !gWindowGlue.m_inval || !gWindowGlue.m_obj) {
+        return;
+    }
+    gActivityGlue.m_env->CallVoidMethod(gWindowGlue.m_obj, gWindowGlue.m_inval);
+}
+
+void SkOSWindow::onPDFSaved(const char title[], const char desc[],
+        const char path[])
+{
+    if (gActivityGlue.m_env) {
+        JNIEnv* env = gActivityGlue.m_env;
+        jstring jtitle = env->NewStringUTF(title);
+        jstring jdesc = env->NewStringUTF(desc);
+        jstring jpath = env->NewStringUTF(path);
+
+        env->CallVoidMethod(gActivityGlue.m_obj, gActivityGlue.m_addToDownloads,
+                jtitle, jdesc, jpath);
+
+        env->DeleteLocalRef(jtitle);
+        env->DeleteLocalRef(jdesc);
+        env->DeleteLocalRef(jpath);
+    }
+}
+
+///////////////////////////////////////////
+/////////////// SkEvent impl //////////////
+///////////////////////////////////////////
+
+void SkEvent::SignalQueueTimer(SkMSec ms)
+{
+    if (!gActivityGlue.m_env || !gActivityGlue.m_startTimer
+            || !gActivityGlue.m_obj || !ms) {
+        return;
+    }
+    gActivityGlue.m_env->CallVoidMethod(gActivityGlue.m_obj,
+            gActivityGlue.m_startTimer, ms);
+}
+
+void SkEvent::SignalNonEmptyQueue()
+{
+    if (!gActivityGlue.m_env || !gWindowGlue.m_queueSkEvent
+            || !gWindowGlue.m_obj) {
+        return;
+    }
+    gActivityGlue.m_env->CallVoidMethod(gWindowGlue.m_obj,
+            gWindowGlue.m_queueSkEvent);
+}
+
+///////////////////////////////////////////
+////////////////// JNI ////////////////////
+///////////////////////////////////////////
+
+static jmethodID GetJMethod(JNIEnv* env, jclass clazz, const char name[],
+        const char signature[])
+{
+    jmethodID m = env->GetMethodID(clazz, name, signature);
+    if (!m) SkDebugf("Could not find Java method %s\n", name);
+    return m;
+}
+
+extern "C" {
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_draw(
+        JNIEnv* env, jobject thiz);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_init(
+        JNIEnv* env, jobject thiz);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_term(
+        JNIEnv* env, jobject thiz);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_updateSize(
+        JNIEnv* env, jobject thiz, jint w, jint h);
+JNIEXPORT bool JNICALL Java_com_skia_sampleapp_SampleApp_handleKeyDown(
+        JNIEnv* env, jobject thiz, jint keyCode, jint uni);
+JNIEXPORT bool JNICALL Java_com_skia_sampleapp_SampleApp_handleKeyUp(
+        JNIEnv* env, jobject thiz, jint keyCode);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_handleClick(
+        JNIEnv* env, jobject thiz, jint owner, jfloat x, jfloat y, jint state);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_createOSWindow(
+        JNIEnv* env, jobject thiz, jobject jsampleView);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_setZoomCenter(
+        JNIEnv* env, jobject thiz, jfloat x, jfloat y);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_zoom(
+        JNIEnv* env, jobject thiz, jfloat factor);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_nextSample(
+        JNIEnv* env, jobject thiz, jboolean fprevious);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_toggleRendering(
+        JNIEnv* env, jobject thiz);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_toggleSlideshow(
+        JNIEnv* env, jobject thiz);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_toggleFps(
+        JNIEnv* env, jobject thiz);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_processSkEvent(
+        JNIEnv* env, jobject thiz);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_serviceQueueTimer(
+        JNIEnv* env, jobject thiz);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_saveToPdf(
+        JNIEnv* env, jobject thiz);
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_postInval(
+        JNIEnv* env, jobject thiz);
+};
+
+JNIEXPORT bool JNICALL Java_com_skia_sampleapp_SampleApp_handleKeyDown(
+        JNIEnv* env, jobject thiz, jint keyCode, jint uni)
+{
+    bool handled = gWindow->handleKey(AndroidKeycodeToSkKey(keyCode));
+    handled |= gWindow->handleChar((SkUnichar) uni);
+    return handled;
+}
+
+JNIEXPORT bool JNICALL Java_com_skia_sampleapp_SampleApp_handleKeyUp(JNIEnv* env,
+        jobject thiz, jint keyCode)
+{
+    return gWindow->handleKeyUp(AndroidKeycodeToSkKey(keyCode));
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_handleClick(JNIEnv* env,
+        jobject thiz, jint owner, jfloat x, jfloat y, jint jstate)
+{
+    SkView::Click::State state;
+    switch(jstate) {
+        case 0:     // MotionEvent.ACTION_DOWN
+            state = SkView::Click::kDown_State;
+            break;
+        case 1:     // MotionEvent.ACTION_UP
+        case 3:     // MotionEvent.ACTION_CANCEL
+            state = SkView::Click::kUp_State;
+            break;
+        case 2:     // MotionEvent.ACTION_MOVE
+            state = SkView::Click::kMoved_State;
+            break;
+        default:
+            SkDebugf("motion event ignored\n");
+            return;
+    }
+    gWindow->handleClick(x, y, state, (void*) owner);
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_updateSize(JNIEnv* env,
+        jobject thiz, jint w, jint h)
+{
+    gWindow->resize(w, h);
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_createOSWindow(
+        JNIEnv* env, jobject thiz, jobject jsampleView)
+{
+    gWindow = new SampleWindow(NULL);
+    jclass clazz = gActivityGlue.m_env->FindClass(
+            "com/skia/sampleapp/SampleView");
+    gWindowGlue.m_obj = gActivityGlue.m_env->NewWeakGlobalRef(jsampleView);
+    gWindowGlue.m_inval = GetJMethod(gActivityGlue.m_env, clazz,
+            "requestRender", "()V");
+    gWindowGlue.m_queueSkEvent = GetJMethod(gActivityGlue.m_env, clazz,
+            "queueSkEvent", "()V");
+    gActivityGlue.m_env->DeleteLocalRef(clazz);
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_init(JNIEnv* env,
+        jobject thiz)
+{
+    gActivityGlue.m_env = env;
+    jclass clazz = env->FindClass("com/skia/sampleapp/SampleApp");
+    gActivityGlue.m_obj = env->NewWeakGlobalRef(thiz);
+    gActivityGlue.m_setTitle = GetJMethod(env, clazz, "setTitle",
+            "(Ljava/lang/CharSequence;)V");
+    gActivityGlue.m_addToDownloads = GetJMethod(env, clazz, "addToDownloads",
+            "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V");
+    gActivityGlue.m_startTimer = GetJMethod(gActivityGlue.m_env, clazz,
+            "startTimer", "(I)V");
+    env->DeleteLocalRef(clazz);
+
+    application_init();
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_term(JNIEnv* env,
+        jobject thiz)
+{
+    delete gWindow;
+    gWindow = NULL;
+    application_term();
+    if (gWindowGlue.m_obj) {
+        env->DeleteWeakGlobalRef(gWindowGlue.m_obj);
+        gWindowGlue.m_obj = NULL;
+    }
+    if (gActivityGlue.m_obj) {
+        env->DeleteWeakGlobalRef(gActivityGlue.m_obj);
+        gActivityGlue.m_obj = NULL;
+    }
+}
+
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_draw(
+        JNIEnv* env, jobject thiz)
+{
+    if (!gWindow) return;
+    gWindow->update(NULL);
+
+    // Copy the bitmap to the screen in raster mode
+    if (!gWindow->drawsToHardware()) {
+
+        SkBitmap bitmap = gWindow->getBitmap();
+
+        GrContext* context = gWindow->getGrContext();
+        if (!context) {
+            context = GrContext::Create(kOpenGL_Shaders_GrEngine, NULL);
+            if (!context || !gWindow->setGrContext(context)) {
+                return;
+            }
+            context->unref();
+        }
+
+        GrRenderTarget* renderTarget;
+
+        GrPlatformSurfaceDesc desc;
+        desc.reset();
+        desc.fSurfaceType = kRenderTarget_GrPlatformSurfaceType;
+        desc.fWidth = bitmap.width();
+        desc.fHeight = bitmap.height();
+        desc.fConfig = kRGBA_8888_GrPixelConfig;
+        desc.fStencilBits = 8;
+        GrGLint buffer;
+        GR_GL_GetIntegerv(GR_GL_FRAMEBUFFER_BINDING, &buffer);
+        desc.fPlatformRenderTarget = buffer;
+
+        renderTarget = static_cast<GrRenderTarget*>(
+                context->createPlatformSurface(desc));
+
+        SkGpuCanvas* gpuCanvas = new SkGpuCanvas(context, renderTarget);
+
+        SkDevice* device = gpuCanvas->createDevice(SkBitmap::kARGB_8888_Config,
+                                          bitmap.width(), bitmap.height(),
+                                          false, false);
+        gpuCanvas->setDevice(device)->unref();
+        gpuCanvas->drawBitmap(bitmap, 0, 0);
+
+        SkSafeUnref(renderTarget);
+        SkSafeUnref(gpuCanvas);
+    }
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_setZoomCenter(
+        JNIEnv* env, jobject thiz, jfloat x, jfloat y)
+{
+    gWindow->setZoomCenter(x, y);
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_zoom(
+        JNIEnv* env, jobject thiz, jfloat factor)
+{
+    gWindow->changeZoomLevel(factor);
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_nextSample(
+        JNIEnv* env, jobject thiz, jboolean fprevious)
+{
+    if (fprevious) {
+        gWindow->previousSample();
+    } else {
+        gWindow->nextSample();
+    }
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_toggleRendering(
+        JNIEnv* env, jobject thiz)
+{
+    gWindow->toggleRendering();
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_toggleSlideshow(
+        JNIEnv* env, jobject thiz)
+{
+    gWindow->toggleSlideshow();
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_toggleFps(
+        JNIEnv* env, jobject thiz)
+{
+    gWindow->toggleFPS();
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_processSkEvent(
+        JNIEnv* env, jobject thiz)
+{
+    if (SkEvent::ProcessEvent()) {
+        SkEvent::SignalNonEmptyQueue();
+    }
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_serviceQueueTimer(
+        JNIEnv* env, jobject thiz)
+{
+    SkEvent::ServiceQueueTimer();
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_saveToPdf(
+        JNIEnv* env, jobject thiz)
+{
+    gWindow->saveToPdf();
+}
+
+JNIEXPORT void JNICALL Java_com_skia_sampleapp_SampleApp_postInval(
+        JNIEnv* env, jobject thiz)
+{
+    gWindow->postInvalDelay();    
+}