Index: experimental/HelloSkia/jni/helloskia.cpp |
diff --git a/experimental/HelloSkia/jni/helloskia.cpp b/experimental/HelloSkia/jni/helloskia.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..480efaef576ceea36d2a4d3ccc8e5aec2d0e708a |
--- /dev/null |
+++ b/experimental/HelloSkia/jni/helloskia.cpp |
@@ -0,0 +1,66 @@ |
+#include <math.h> |
+#include <string.h> |
+#include <jni.h> |
+#include <android/bitmap.h> |
+ |
+#include "SkCanvas.h" |
+#include "SkData.h" |
+#include "SkGraphics.h" |
+#include "SkSurface.h" |
+#include "SkImage.h" |
+#include "SkStream.h" |
+#include "SkString.h" |
+#include "SkTime.h" |
+ |
+extern "C" |
+JNIEXPORT void JNICALL Java_com_example_HelloSkiaActivity_drawIntoBitmap(JNIEnv* env, |
djsollen
2013/06/03 18:24:45
add a brief comment explaining what this method do
Zach Reizner
2013/06/03 22:54:25
Done.
|
+ jobject thiz, jobject dstBitmap) |
+{ |
djsollen
2013/06/03 18:24:45
move to previous line
Zach Reizner
2013/06/03 22:54:25
Done.
|
+ |
+ // Grab the dst bitmap info and pixels |
+ AndroidBitmapInfo dstInfo; |
+ void* dstPixels; |
+ AndroidBitmap_getInfo(env, dstBitmap, &dstInfo); |
+ AndroidBitmap_lockPixels(env, dstBitmap, &dstPixels); |
+ |
+ SkAutoGraphics ag; |
Zach Reizner
2013/06/03 22:54:25
This was removed because repeated constructions/de
|
+ SkString path("skhello.png"); |
djsollen
2013/06/03 18:24:45
remove this unless you plan on drawing it.
Zach Reizner
2013/06/03 22:54:25
Done.
|
+ SkString text("Skia is the Best!"); |
djsollen
2013/06/03 18:24:45
define text where you use it not at the beginning
Zach Reizner
2013/06/03 22:54:25
Done.
|
+ |
+ // Setup |
+ SkPaint paint; |
djsollen
2013/06/03 18:24:45
same as above (define it closer to where it is use
Zach Reizner
2013/06/03 22:54:25
Done.
|
+ paint.setAntiAlias(true); |
+ paint.setTextSize(SkIntToScalar(30)); |
+ paint.setTextAlign(SkPaint::kLeft_Align); |
+ |
+ SkImage::Info info = { |
+ dstInfo.width, dstInfo.height, SkImage::kPMColor_ColorType, SkImage::kPremul_AlphaType |
+ }; |
+ |
+ // Create a surface and get its canvas |
+ SkAutoTUnref<SkSurface> surface(SkSurface::NewRaster(info)); |
+ SkCanvas* canvas = surface->getCanvas(); |
+ |
+ // Draw something "interesting" |
djsollen
2013/06/03 18:24:45
let's draw some more interesting stuff. You can pr
Zach Reizner
2013/06/03 22:54:25
Done.
|
+ SkScalar fontHeight = paint.getFontSpacing(); |
+ canvas->drawColor(SK_ColorWHITE); |
+ canvas->drawText(text.c_str(), text.size(), |
+ 10, fontHeight, |
+ paint); |
+ |
+ // Grab the pixels from the canvas |
+ SkBitmap canvasBitmap; |
djsollen
2013/06/03 18:24:45
you shouldn't need this at all.
Zach Reizner
2013/06/03 22:54:25
Done.
|
+ canvasBitmap.setConfig(SkBitmap::kARGB_8888_Config, dstInfo.width, dstInfo.height); |
+ canvas->readPixels(&canvasBitmap, 0, 0); // Read from the top corner |
+ |
+ // Copy the pixels from Skia into the Java Bitmap |
+ for (uint32_t row = 0; row < dstInfo.height; row++) |
djsollen
2013/06/03 18:24:45
this isn't very efficient. We should just have our
Zach Reizner
2013/06/03 22:54:25
Done.
|
+ { |
+ void* dstRow = (char*)dstPixels + dstInfo.stride * row; |
+ void* srcRow = canvasBitmap.getAddr(0, row); |
+ memcpy(dstRow, srcRow, dstInfo.stride); |
+ } |
+ |
+ // Unlock the dst |
+ AndroidBitmap_unlockPixels(env, dstBitmap); |
+} |