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Added rounding code to the C++ port as well.

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git-svn-id: https://zxing.googlecode.com/svn/trunk@1565 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
dswitkin@google.com 2010-08-26 14:13:33 +00:00
parent 226bf1a1a6
commit d26cfc7fd1
1 changed files with 5 additions and 2 deletions
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7
cpp/magick/src/MagickBitmapSource.cpp
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@ -52,7 +52,9 @@ unsigned char* MagickBitmapSource::getRow(int y, unsigned char* row) {
for (int x = 0; x < width; x++) {
const PixelPacket* p = pixel_cache + y * width + x;
// We assume 16 bit values here
row[x] = (unsigned char)((306 * ((int)p->red >> 8) + 601 * ((int)p->green >> 8) + 117 * ((int)p->blue >> 8)) >> 10);
// 0x200 = 1<<9, half an lsb of the result to force rounding
row[x] = (unsigned char)((306 * ((int)p->red >> 8) + 601 * ((int)p->green >> 8) +
117 * ((int)p->blue >> 8) + 0x200) >> 10);
}
return row;
@ -67,7 +69,8 @@ unsigned char* MagickBitmapSource::getMatrix() {
const Magick::PixelPacket* p = pixel_cache;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
*m = (unsigned char)((306 * ((int)p->red >> 8) + 601 * ((int)p->green >> 8) + 117 * ((int)p->blue >> 8)) >> 10);
*m = (unsigned char)((306 * ((int)p->red >> 8) + 601 * ((int)p->green >> 8) +
117 * ((int)p->blue >> 8) + 0x200) >> 10);
m++;
p++;
}