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Issue 1296 Faster check for transparent pixels

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git-svn-id: https://zxing.googlecode.com/svn/trunk@2324 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
srowen 2012-06-25 21:33:18 +00:00
parent 5e9f84dea2
commit 845b3d81e1
2 changed files with 20 additions and 6 deletions
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13
core/test/src/com/google/zxing/BufferedImageLuminanceSource.java
View file

@ -49,12 +49,19 @@ public final class BufferedImageLuminanceSource extends LuminanceSource {
// The color of fully-transparent pixels is irrelevant. They are often, technically, fully-transparent
// black (0 alpha, and then 0 RGB). They are often used, of course as the "white" area in a
// barcode image. Force any such pixel to be white:
int[] buffer = new int[width];
for (int y = top; y < top + height; y++) {
for (int x = left; x < left + width; x++) {
if ((image.getRGB(x, y) & 0xFF000000) == 0) {
image.setRGB(x, y, 0xFFFFFFFF); // = white
image.getRGB(left, y, width, 1, buffer, 0, sourceWidth);
boolean rowChanged = false;
for (int x = 0; x < width; x++) {
if ((buffer[x] & 0xFF000000) == 0) {
buffer[x] = 0xFFFFFFFF; // = white
rowChanged = true;
}
}
if (rowChanged) {
image.setRGB(left, y, width, 1, buffer, 0, sourceWidth);
}
}
// Create a grayscale copy, no need to calculate the luminance manually

13
javase/src/com/google/zxing/client/j2se/BufferedImageLuminanceSource.java
View file

@ -51,12 +51,19 @@ public final class BufferedImageLuminanceSource extends LuminanceSource {
// The color of fully-transparent pixels is irrelevant. They are often, technically, fully-transparent
// black (0 alpha, and then 0 RGB). They are often used, of course as the "white" area in a
// barcode image. Force any such pixel to be white:
int[] buffer = new int[width];
for (int y = top; y < top + height; y++) {
for (int x = left; x < left + width; x++) {
if ((image.getRGB(x, y) & 0xFF000000) == 0) {
image.setRGB(x, y, 0xFFFFFFFF); // = white
image.getRGB(left, y, width, 1, buffer, 0, sourceWidth);
boolean rowChanged = false;
for (int x = 0; x < width; x++) {
if ((buffer[x] & 0xFF000000) == 0) {
buffer[x] = 0xFFFFFFFF; // = white
rowChanged = true;
}
}
if (rowChanged) {
image.setRGB(left, y, width, 1, buffer, 0, sourceWidth);
}
}
// Create a grayscale copy, no need to calculate the luminance manually