#ifndef _LIBQSCALE_H
#define _LIBQSCALE_H
+#include <stdio.h>
#include "jpeglib.h"
typedef struct {
/* True image size */
- int width, height;
+ unsigned width, height;
+
+ /* 1 = B/W, 3 = YCbCr */
+ unsigned num_components;
/* Component image sizes (possibly subsampled) */
- int w0, h0;
- int w1, h1;
- int w2, h2;
+ unsigned w0, h0;
+ unsigned w1, h1;
+ unsigned w2, h2;
+
+ /* Sampling factors */
+ unsigned samp_h0, samp_v0;
+ unsigned samp_h1, samp_v1;
+ unsigned samp_h2, samp_v2;
/* The data itself */
JSAMPLE *data_y, *data_cb, *data_cr;
enum qscale_scaling_filter {
LANCZOS = 0,
+ MITCHELL = 1,
+};
+
+enum qscale_jpeg_mode {
+ SEQUENTIAL = 0,
+ PROGRESSIVE = 1,
};
qscale_img *qscale_load_jpeg(const char *filename);
-int qscale_save_jpeg(const qscale_img *image, const char *filename);
+qscale_img *qscale_load_jpeg_from_stdio(FILE *file);
+int qscale_save_jpeg(const qscale_img *img, const char *filename, unsigned jpeg_quality, enum qscale_jpeg_mode jpeg_mode);
+int qscale_save_jpeg_to_stdio(const qscale_img *img, FILE *file, unsigned jpeg_quality, enum qscale_jpeg_mode jpeg_mode);
-qscale_img *qscale_scale(qscale_img *source, int width, int height, int samp_h0, int samp_v0, int samp_h1, int samp_v1, int samp_h2, int samp_v2, int jpeg_quality);
-void qscale_destroy(qscale_img *image);
+qscale_img *qscale_clone(const qscale_img *img);
+qscale_img *qscale_scale(qscale_img *src, unsigned width, unsigned height, unsigned samp_h0, unsigned samp_v0, unsigned samp_h1, unsigned samp_v1, unsigned samp_h2, unsigned samp_v2, enum qscale_scaling_filter scaling_filter);
+void qscale_destroy(qscale_img *img);
#endif /* !defined(_LIBQSCALE_H) */