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Unified Diff: experimental/HelloSkia/jni/helloskia.cpp

Issue 16336004: create simple skia app for android using jni (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: Created 7 years, 7 months ago
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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);
+}

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