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Made this more like RGBMonochromBitmapSource, caching a row instead of the whole image

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git-svn-id: https://zxing.googlecode.com/svn/trunk@425 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
srowen 2008-06-12 16:29:04 +00:00
parent d77371d5fc
commit 20df62a8af
1 changed files with 21 additions and 8 deletions
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29
javame/src/com/google/zxing/client/j2me/LCDUIImageMonochromeBitmapSource.java
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@ -27,15 +27,20 @@ import javax.microedition.lcdui.Image;
*/ */
public final class LCDUIImageMonochromeBitmapSource extends BaseMonochromeBitmapSource { public final class LCDUIImageMonochromeBitmapSource extends BaseMonochromeBitmapSource {
private final int[] rgbPixels; private final Image image;
private final int width;
private final int height; private final int height;
private final int width;
private final int[] rgbRow;
private final int[] pixelHolder;
private int cachedRow;
public LCDUIImageMonochromeBitmapSource(Image image) { public LCDUIImageMonochromeBitmapSource(Image image) {
width = image.getWidth(); this.image = image;
height = image.getHeight(); height = image.getHeight();
rgbPixels = new int[width * height]; width = image.getWidth();
image.getRGB(rgbPixels, 0, width, 0, 0, width, height); rgbRow = new int[width];
pixelHolder = new int[1];
cachedRow = -1;
} }
public int getHeight() { public int getHeight() {
@ -47,7 +52,13 @@ public final class LCDUIImageMonochromeBitmapSource extends BaseMonochromeBitmap
} }
public int getLuminance(int x, int y) { public int getLuminance(int x, int y) {
int pixel = rgbPixels[y * width + x]; int pixel;
if (cachedRow == y) {
pixel = rgbRow[x];
} else {
image.getRGB(pixelHolder, 0, width, x, y, 1, 1);
pixel = pixelHolder[0];
}
// Instead of multiplying by 306, 601, 117, we multiply by 256, 512, 256, so that // Instead of multiplying by 306, 601, 117, we multiply by 256, 512, 256, so that
// the multiplies can be implemented as shifts. // the multiplies can be implemented as shifts.
@ -66,9 +77,11 @@ public final class LCDUIImageMonochromeBitmapSource extends BaseMonochromeBitmap
(pixel & 0x000000FF )) >> 2; (pixel & 0x000000FF )) >> 2;
} }
// Nothing to do, since we have direct access to the image data.
public void cacheRowForLuminance(int y) { public void cacheRowForLuminance(int y) {
if (y != cachedRow) {
image.getRGB(rgbRow, 0, width, 0, y, width, 1);
cachedRow = y;
}
} }
} }