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Nvidia's patch for reusing bitmap in image region decoding.

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bug: 5884845
Change-Id: I43d4d86ee94591b0b53393dfba13c7cc5c4e428d
This commit is contained in:
Owen Lin
2012-04-25 18:49:09 +08:00
parent 9cb376e792
commit f970c2e6de
2 changed files with 22 additions and 8 deletions
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1
core/jni/android/graphics/BitmapFactory.h
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@@ -16,6 +16,7 @@ extern jfieldID gOptions_widthFieldID;
extern jfieldID gOptions_heightFieldID;
extern jfieldID gOptions_mimeFieldID;
extern jfieldID gOptions_mCancelID;
extern jfieldID gOptions_bitmapFieldID;
jstring getMimeTypeString(JNIEnv* env, SkImageDecoder::Format format);

29
core/jni/android/graphics/BitmapRegionDecoder.cpp
View File

@@ -29,6 +29,7 @@
#include "CreateJavaOutputStreamAdaptor.h"
#include "Utils.h"
#include "JNIHelp.h"
#include "SkTScopedPtr.h"
#include <android_runtime/AndroidRuntime.h>
#include "android_util_Binder.h"
@@ -180,7 +181,8 @@ static jobject nativeNewInstanceFromAsset(JNIEnv* env, jobject clazz,
* reportSizeToVM not supported
*/
static jobject nativeDecodeRegion(JNIEnv* env, jobject, SkBitmapRegionDecoder *brd,
int start_x, int start_y, int width, int height, jobject options) {
int start_x, int start_y, int width, int height, jobject options) {
jobject tileBitmap = NULL;
SkImageDecoder *decoder = brd->getDecoder();
int sampleSize = 1;
SkBitmap::Config prefConfig = SkBitmap::kNo_Config;
@@ -199,12 +201,12 @@ static jobject nativeDecodeRegion(JNIEnv* env, jobject, SkBitmapRegionDecoder *b
doDither = env->GetBooleanField(options, gOptions_ditherFieldID);
preferQualityOverSpeed = env->GetBooleanField(options,
gOptions_preferQualityOverSpeedFieldID);
// Get the bitmap for re-use if it exists.
tileBitmap = env->GetObjectField(options, gOptions_bitmapFieldID);
}
decoder->setDitherImage(doDither);
decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);
SkBitmap* bitmap = new SkBitmap;
SkAutoTDelete<SkBitmap> adb(bitmap);
AutoDecoderCancel adc(options, decoder);
// To fix the race condition in case "requestCancelDecode"
@@ -219,6 +221,17 @@ static jobject nativeDecodeRegion(JNIEnv* env, jobject, SkBitmapRegionDecoder *b
region.fTop = start_y;
region.fRight = start_x + width;
region.fBottom = start_y + height;
SkBitmap* bitmap = NULL;
SkTScopedPtr<SkBitmap> adb;
if (tileBitmap != NULL) {
// Re-use bitmap.
bitmap = GraphicsJNI::getNativeBitmap(env, tileBitmap);
}
if (bitmap == NULL) {
bitmap = new SkBitmap;
adb.reset(bitmap);
}
if (!brd->decodeRegion(bitmap, region, prefConfig, sampleSize)) {
return nullObjectReturn("decoder->decodeRegion returned false");
@@ -235,12 +248,12 @@ static jobject nativeDecodeRegion(JNIEnv* env, jobject, SkBitmapRegionDecoder *b
getMimeTypeString(env, decoder->getFormat()));
}
// detach bitmap from its autodeleter, since we want to own it now
adb.detach();
if (tileBitmap != NULL) {
return tileBitmap;
}
SkPixelRef* pr = bitmap->pixelRef();
// promise we will never change our pixels (great for sharing and pictures)
pr->setImmutable();
// detach bitmap from its autodeleter, since we want to own it now
adb.release();
JavaPixelAllocator* allocator = (JavaPixelAllocator*) decoder->getAllocator();
jbyteArray buff = allocator->getStorageObjAndReset();