private int packBitmaps(Atlas.Type type, int width, int height, Atlas.Entry entry) {
int total = 0;
Atlas atlas = new Atlas(type, width, height);
final int count = mBitmaps.size();
for (int i = 0; i < count; i++) {
final Bitmap bitmap = mBitmaps.get(i);
if (atlas.pack(bitmap.getWidth(), bitmap.getHeight(), entry) != null) {
total++;
}
}
return total;
}
/**
* Renders a list of bitmaps into the atlas. The position of each bitmap was decided by the
* packing algorithm and will be honored by this method.
*
* @param buffer The buffer to render the atlas entries into
* @param atlas The atlas to pack the bitmaps into
* @param packCount The number of bitmaps that will be packed in the atlas
* @return true if the atlas was rendered, false otherwise
*/
@SuppressWarnings("MismatchedReadAndWriteOfArray")
private boolean renderAtlas(GraphicBuffer buffer, Atlas atlas, int packCount) {
// Use a Source blend mode to improve performance, the target bitmap
// will be zero'd out so there's no need to waste time applying blending
final Paint paint = new Paint();
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
// We always render the atlas into a bitmap. This bitmap is then
// uploaded into the GraphicBuffer using OpenGL to swizzle the content
final Bitmap atlasBitmap =
Bitmap.createBitmap(buffer.getWidth(), buffer.getHeight(), Bitmap.Config.ARGB_8888);
final Canvas canvas = new Canvas(atlasBitmap);
final Atlas.Entry entry = new Atlas.Entry();
mAtlasMap = new long[packCount * ATLAS_MAP_ENTRY_FIELD_COUNT];
long[] atlasMap = mAtlasMap;
int mapIndex = 0;
boolean result = false;
final long startRender = System.nanoTime();
final int count = mBitmaps.size();
for (int i = 0; i < count; i++) {
final Bitmap bitmap = mBitmaps.get(i);
if (atlas.pack(bitmap.getWidth(), bitmap.getHeight(), entry) != null) {
// We have more bitmaps to pack than the current configuration
// says, we were most likely not able to detect a change in the
// list of preloaded drawables, abort and delete the configuration
if (mapIndex >= mAtlasMap.length) {
deleteDataFile();
break;
}
canvas.save();
canvas.translate(entry.x, entry.y);
canvas.drawBitmap(bitmap, 0.0f, 0.0f, null);
canvas.restore();
atlasMap[mapIndex++] = bitmap.refSkPixelRef();
atlasMap[mapIndex++] = entry.x;
atlasMap[mapIndex++] = entry.y;
}
}
final long endRender = System.nanoTime();
releaseCanvas(canvas, atlasBitmap);
result = nUploadAtlas(buffer, atlasBitmap);
atlasBitmap.recycle();
final long endUpload = System.nanoTime();
if (DEBUG_ATLAS) {
float renderDuration = (endRender - startRender) / 1000.0f / 1000.0f;
float uploadDuration = (endUpload - endRender) / 1000.0f / 1000.0f;
Log.d(
LOG_TAG,
String.format(
"Rendered atlas in %.2fms (%.2f+%.2fms)",
renderDuration + uploadDuration, renderDuration, uploadDuration));
}
return result;
}