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This commit is contained in:
Kovid Goyal 2016-05-06 09:01:17 +05:30
parent 3224129dba
commit a244ee9da6
1 changed files with 8 additions and 2 deletions
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10
src/calibre/utils/imageops/imageops.cpp
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@ -18,6 +18,7 @@
#define M_PI 3.14159265358979323846 #define M_PI 3.14159265358979323846
#endif #endif
// Remove borders (auto-trim) {{{
unsigned int read_border_row(const QImage &img, const unsigned int width, const unsigned int height, int *reds, const double fuzz, const bool top) { unsigned int read_border_row(const QImage &img, const unsigned int width, const unsigned int height, int *reds, const double fuzz, const bool top) {
unsigned int r = 0, c = 0, start = 0, delta = top ? 1 : -1, ans = 0; unsigned int r = 0, c = 0, start = 0, delta = top ? 1 : -1, ans = 0;
const QRgb *row = NULL, *pixel = NULL; const QRgb *row = NULL, *pixel = NULL;
@ -91,8 +92,9 @@ QImage remove_borders(const QImage &image, double fuzz) {
delete[] buf; delete[] buf;
return img; return img;
} }
// }}}
QImage grayscale(const QImage &image) { QImage grayscale(const QImage &image) { // {{{
QImage img = image; QImage img = image;
QRgb *row = NULL, *pixel = NULL; QRgb *row = NULL, *pixel = NULL;
int r = 0, gray = 0, width = img.width(), height = img.height(); int r = 0, gray = 0, width = img.width(), height = img.height();
@ -108,8 +110,9 @@ QImage grayscale(const QImage &image) {
} }
Py_END_ALLOW_THREADS; Py_END_ALLOW_THREADS;
return img; return img;
} } // }}}
// Convolution {{{
#define CONVOLVE_ACC(weight, pixel) \ #define CONVOLVE_ACC(weight, pixel) \
r+=((weight))*(qRed((pixel))); g+=((weight))*(qGreen((pixel))); \ r+=((weight))*(qRed((pixel))); g+=((weight))*(qGreen((pixel))); \
b+=((weight))*(qBlue((pixel))); b+=((weight))*(qBlue((pixel)));
@ -228,3 +231,6 @@ QImage convolve(QImage &img, int matrix_size, float *matrix) {
delete[] normalize_matrix; delete[] normalize_matrix;
return buffer; return buffer;
} }
// }}}