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Load sampled down bitmaps #213

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Load sampled down bitmaps #213

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55 changes: 52 additions & 3 deletions src/org/andengine/opengl/texture/atlas/bitmap/source/AssetBitmapTextureAtlasSource.java
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@
import android.graphics.BitmapFactory;

/**
* (c) 2010 Nicolas Gramlich
* (c) 2010 Nicolas Gramlich
* (c) 2011 Zynga Inc.
*
* @author Nicolas Gramlich
Expand Down Expand Up @@ -55,9 +55,35 @@ public static AssetBitmapTextureAtlasSource create(final AssetManager pAssetMana

return new AssetBitmapTextureAtlasSource(pAssetManager, pAssetPath, pTextureX, pTextureY, decodeOptions.outWidth, decodeOptions.outHeight);
}

public static AssetBitmapTextureAtlasSource createSampled(final AssetManager pAssetManager, final String pAssetPath, final int pReqWidth, final int pReqHeight) {
final BitmapFactory.Options decodeOptions = new BitmapFactory.Options();
decodeOptions.inJustDecodeBounds = true;

InputStream in = null;
try {
in = pAssetManager.open(pAssetPath);
BitmapFactory.decodeStream(in, null, decodeOptions);
} catch (final IOException e) {
Debug.e("Failed loading Bitmap in AssetBitmapTextureAtlasSource. AssetPath: " + pAssetPath, e);
} finally {
StreamUtils.close(in);
}

// Calculate inSampleSize
final int lInSampleSize = calculateInSampleSize(decodeOptions, pReqWidth, pReqHeight);
final int lTextureWidth = decodeOptions.outWidth / lInSampleSize;
final int lTextureHeight = decodeOptions.outHeight / lInSampleSize;
Debug.i("createSampled(pAssetManager, pAssetPath=" + pAssetPath + ", pReqWidth=" + pReqWidth + ", pReqHeight=" + pReqHeight + ") original image of " + decodeOptions.outWidth + "x" + decodeOptions.outHeight + " lInSampleSize=" + lInSampleSize + " -> resampled to size " + lTextureWidth + "x" + lTextureHeight);
return new AssetBitmapTextureAtlasSource(pAssetManager, pAssetPath, 0, 0, lTextureWidth, lTextureHeight, lInSampleSize);
}

AssetBitmapTextureAtlasSource(final AssetManager pAssetManager, final String pAssetPath, final int pTextureX, final int pTextureY, final int pTextureWidth, final int pTextureHeight) {
super(pTextureX, pTextureY, pTextureWidth, pTextureHeight);
this(pAssetManager, pAssetPath, pTextureX, pTextureY, pTextureWidth, pTextureHeight, 1);
}

AssetBitmapTextureAtlasSource(final AssetManager pAssetManager, final String pAssetPath, final int pTextureX, final int pTextureY, final int pTextureWidth, final int pTextureHeight, final int pSampleSize) {
super(pTextureX, pTextureY, pTextureWidth, pTextureHeight, pSampleSize);

this.mAssetManager = pAssetManager;
this.mAssetPath = pAssetPath;
Expand All @@ -82,7 +108,9 @@ public Bitmap onLoadBitmap(final Config pBitmapConfig) {
try {
final BitmapFactory.Options decodeOptions = new BitmapFactory.Options();
decodeOptions.inPreferredConfig = pBitmapConfig;

if (mSampleSize != 1) {
decodeOptions.inSampleSize = mSampleSize;
}
in = this.mAssetManager.open(this.mAssetPath);
return BitmapFactory.decodeStream(in, null, decodeOptions);
} catch (final IOException e) {
Expand All @@ -101,6 +129,27 @@ public String toString() {
// ===========================================================
// Methods
// ===========================================================

public static int calculateInSampleSize(final BitmapFactory.Options pOptions, final int pReqWidth, final int pReqHeight) {
// Raw height and width of image
final int lHeight = pOptions.outHeight;
final int lWidth = pOptions.outWidth;
int lInSampleSize = 1;

if (lHeight > pReqHeight || lWidth > pReqWidth) {

// Calculate ratios of height and width to requested height and width
final int lHeightRatio = Math.round((float) lHeight / (float) pReqHeight);
final int lWidthRatio = Math.round((float) lWidth / (float) pReqWidth);

// Choose the smallest ratio as inSampleSize value, this will guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
lInSampleSize = lHeightRatio < lWidthRatio ? lHeightRatio : lWidthRatio;
}

return lInSampleSize;
}

// ===========================================================
// Inner and Anonymous Classes
Expand Down
13 changes: 12 additions & 1 deletion src/org/andengine/opengl/texture/atlas/source/BaseTextureAtlasSource.java
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Expand Up @@ -20,16 +20,22 @@ public abstract class BaseTextureAtlasSource implements ITextureAtlasSource {
protected int mTextureY;
protected int mTextureWidth;
protected int mTextureHeight;
protected int mSampleSize;

// ===========================================================
// Constructors
// ===========================================================

public BaseTextureAtlasSource(final int pTextureX, final int pTextureY, final int pTextureWidth, final int pTextureHeight) {
public BaseTextureAtlasSource(final int pTextureX, final int pTextureY, final int pTextureWidth, final int pTextureHeight, final int pSampleSize) {
this.mTextureX = pTextureX;
this.mTextureY = pTextureY;
this.mTextureWidth = pTextureWidth;
this.mTextureHeight = pTextureHeight;
this.mSampleSize = pSampleSize;
}

public BaseTextureAtlasSource(final int pTextureX, final int pTextureY, final int pTextureWidth, final int pTextureHeight) {
this(pTextureX, pTextureY, pTextureWidth, pTextureHeight, 1);
}

// ===========================================================
Expand Down Expand Up @@ -80,6 +86,11 @@ public void setTextureHeight(final int pTextureHeight) {
// Methods for/from SuperClass/Interfaces
// ===========================================================

@Override
public int getSampleSize() {
return mSampleSize;
}

@Override
public String toString() {
return this.getClass().getSimpleName() + "( " + this.getTextureWidth() + "x" + this.getTextureHeight() + " @ "+ this.mTextureX + "/" + this.mTextureY + " )";
Expand Down
2 changes: 2 additions & 0 deletions src/org/andengine/opengl/texture/atlas/source/ITextureAtlasSource.java
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Expand Up @@ -26,6 +26,8 @@ public interface ITextureAtlasSource {
public int getTextureHeight();
public void setTextureWidth(final int pTextureWidth);
public void setTextureHeight(final int pTextureHeight);

public int getSampleSize();

public ITextureAtlasSource deepCopy();
}
2 changes: 1 addition & 1 deletion src/org/andengine/opengl/texture/region/TextureRegionFactory.java
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Expand Up @@ -67,7 +67,7 @@ public static <T extends ITextureAtlasSource> TextureRegion createFromSource(fin
}

public static <T extends ITextureAtlasSource> TextureRegion createFromSource(final ITextureAtlas<T> pTextureAtlas, final T pTextureAtlasSource, final int pTextureX, final int pTextureY, final boolean pRotated) {
final TextureRegion textureRegion = new TextureRegion(pTextureAtlas, pTextureX, pTextureY, pTextureAtlasSource.getTextureWidth(), pTextureAtlasSource.getTextureHeight(), pRotated);
final TextureRegion textureRegion = new TextureRegion(pTextureAtlas, pTextureX, pTextureY, pTextureAtlasSource.getTextureWidth(), pTextureAtlasSource.getTextureHeight(), pTextureAtlasSource.getSampleSize(), pRotated);
pTextureAtlas.addTextureAtlasSource(pTextureAtlasSource, pTextureX, pTextureY);
return textureRegion;
}
Expand Down