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Use constScanLine()

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This commit is contained in:
Kovid Goyal 2016-05-06 08:49:35 +05:30
parent 59da7ed5be
commit 52e18ff800
1 changed files with 3 additions and 2 deletions
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5
src/calibre/utils/imageops/imageops.cpp
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@ -117,7 +117,8 @@ QImage grayscale(const QImage &image) {
QImage convolve(QImage &img, int matrix_size, float *matrix) {
int i, x, y, w, h, matrix_x, matrix_y;
int edge = matrix_size/2;
QRgb *dest, *src, *s, **scanblock;
QRgb *dest, *s, **scanblock;
const QRgb *src = NULL;
float *m, *normalize_matrix, normalize, r, g, b;
if(!(matrix_size % 2))
@ -147,7 +148,7 @@ QImage convolve(QImage &img, int matrix_size, float *matrix) {
// apply
for(y=0; y < h; ++y){
src = (QRgb *)img.scanLine(y);
src = reinterpret_cast<const QRgb*>(img.constScanLine(y));
dest = (QRgb *)buffer.scanLine(y);
// Read in scanlines to pixel neighborhood. If the scanline is outside
// the image use the top or bottom edge.