return dst;
}
+
+int qscale_save_jpeg(const qscale_img *img, const char *filename, unsigned jpeg_quality, enum qscale_jpeg_mode jpeg_mode)
+{
+ FILE *file = fopen(filename, "wb");
+ if (file == NULL) {
+ return -1;
+ }
+
+ int err = qscale_save_jpeg_to_stdio(img, file, jpeg_quality, jpeg_mode);
+
+ fclose(file);
+ return err;
+}
+
+int qscale_save_jpeg_to_stdio(const qscale_img *img, FILE *file, unsigned jpeg_quality, enum qscale_jpeg_mode jpeg_mode)
+{
+ struct jpeg_compress_struct cinfo;
+ struct jpeg_error_mgr jerr;
+ cinfo.err = jpeg_std_error(&jerr);
+ jpeg_create_compress(&cinfo);
+ jpeg_stdio_dest(&cinfo, stdout);
+ cinfo.input_components = 3;
+ jpeg_set_defaults(&cinfo);
+ jpeg_set_quality(&cinfo, jpeg_quality, FALSE);
+ cinfo.image_width = img->width;
+ cinfo.image_height = img->height;
+ cinfo.raw_data_in = TRUE;
+ jpeg_set_colorspace(&cinfo, JCS_YCbCr);
+ cinfo.comp_info[0].h_samp_factor = img->samp_h0;
+ cinfo.comp_info[0].v_samp_factor = img->samp_v0;
+ cinfo.comp_info[1].h_samp_factor = img->samp_h1;
+ cinfo.comp_info[1].v_samp_factor = img->samp_v1;
+ cinfo.comp_info[2].h_samp_factor = img->samp_h2;
+ cinfo.comp_info[2].v_samp_factor = img->samp_v2;
+ jpeg_start_compress(&cinfo, TRUE);
+
+ unsigned dstride0 = (img->w0 + DCTSIZE-1) & ~(DCTSIZE-1);
+ unsigned dstride1 = (img->w1 + DCTSIZE-1) & ~(DCTSIZE-1);
+ unsigned dstride2 = (img->w2 + DCTSIZE-1) & ~(DCTSIZE-1);
+
+ int total_lines = 0;
+ int blocks = 0;
+ while (total_lines < cinfo.comp_info[0].height_in_blocks * DCTSIZE) {
+ unsigned max_lines = cinfo.max_v_samp_factor * DCTSIZE;
+
+ JSAMPROW y_row_ptrs[max_lines];
+ JSAMPROW cb_row_ptrs[max_lines];
+ JSAMPROW cr_row_ptrs[max_lines];
+ JSAMPROW* ptrs[] = { y_row_ptrs, cb_row_ptrs, cr_row_ptrs };
+ int i;
+
+ for (i = 0; i < max_lines; ++i) {
+ /* simple edge extension */
+ int yline = i + blocks*DCTSIZE*cinfo.comp_info[0].v_samp_factor;
+ if (yline > img->h0 - 1)
+ yline = img->h0 - 1;
+
+ int cbline = i + blocks*DCTSIZE*cinfo.comp_info[1].v_samp_factor;
+ if (cbline > img->h1 - 1)
+ cbline = img->h1 - 1;
+
+ int crline = i + blocks*DCTSIZE*cinfo.comp_info[2].v_samp_factor;
+ if (crline > img->h2 - 1)
+ crline = img->h2 - 1;
+
+ y_row_ptrs[i] = img->data_y + yline * dstride0;
+ cb_row_ptrs[i] = img->data_cb + cbline * dstride1;
+ cr_row_ptrs[i] = img->data_cr + crline * dstride2;
+ }
+
+ total_lines += max_lines;
+ ++blocks;
+
+ jpeg_write_raw_data(&cinfo, ptrs, max_lines);
+ }
+ jpeg_finish_compress(&cinfo);
+ jpeg_destroy_compress(&cinfo);
+
+ return 0;
+}
enum qscale_jpeg_mode {
SEQUENTIAL = 0,
- PROGRESSIVE = 1
};
qscale_img *qscale_load_jpeg(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 *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);
qscale_img *img = qscale_load_jpeg_from_stdio(stdin);
qscale_img *scaled = qscale_scale(img, nominal_w, nominal_h, samp_h0, samp_v0, samp_h1, samp_v1, samp_h2, samp_v2, LANCZOS);
qscale_destroy(img);
-
- struct jpeg_compress_struct cinfo;
- struct jpeg_error_mgr jerr;
- cinfo.err = jpeg_std_error(&jerr);
- jpeg_create_compress(&cinfo);
- jpeg_stdio_dest(&cinfo, stdout);
- cinfo.input_components = 3;
- jpeg_set_defaults(&cinfo);
- jpeg_set_quality(&cinfo, jpeg_quality, FALSE);
- cinfo.image_width = nominal_w;
- cinfo.image_height = nominal_h;
- cinfo.raw_data_in = TRUE;
- jpeg_set_colorspace(&cinfo, JCS_YCbCr);
- cinfo.comp_info[0].h_samp_factor = samp_h0;
- cinfo.comp_info[0].v_samp_factor = samp_v0;
- cinfo.comp_info[1].h_samp_factor = samp_h1;
- cinfo.comp_info[1].v_samp_factor = samp_v1;
- cinfo.comp_info[2].h_samp_factor = samp_h2;
- cinfo.comp_info[2].v_samp_factor = samp_v2;
- jpeg_start_compress(&cinfo, TRUE);
-
- unsigned dstride0 = (scaled->w0 + DCTSIZE-1) & ~(DCTSIZE-1);
- unsigned dstride1 = (scaled->w1 + DCTSIZE-1) & ~(DCTSIZE-1);
- unsigned dstride2 = (scaled->w2 + DCTSIZE-1) & ~(DCTSIZE-1);
-
- int total_lines = 0;
- int blocks = 0;
- while (total_lines < cinfo.comp_info[0].height_in_blocks * DCTSIZE) {
- unsigned max_lines = cinfo.max_v_samp_factor * DCTSIZE;
-
- JSAMPROW y_row_ptrs[max_lines];
- JSAMPROW cb_row_ptrs[max_lines];
- JSAMPROW cr_row_ptrs[max_lines];
- JSAMPROW* ptrs[] = { y_row_ptrs, cb_row_ptrs, cr_row_ptrs };
- int i;
-
- for (i = 0; i < max_lines; ++i) {
- /* simple edge extension */
- int yline = i + blocks*DCTSIZE*cinfo.comp_info[0].v_samp_factor;
- if (yline > scaled->h0 - 1)
- yline = scaled->h0 - 1;
-
- int cbline = i + blocks*DCTSIZE*cinfo.comp_info[1].v_samp_factor;
- if (cbline > scaled->h1 - 1)
- cbline = scaled->h2 - 1;
-
- int crline = i + blocks*DCTSIZE*cinfo.comp_info[2].v_samp_factor;
- if (crline > scaled->h2 - 1)
- crline = scaled->h2 - 1;
-
- y_row_ptrs[i] = scaled->data_y + yline * dstride0;
- cb_row_ptrs[i] = scaled->data_cb + cbline * dstride1;
- cr_row_ptrs[i] = scaled->data_cr + crline * dstride2;
- }
-
- total_lines += max_lines;
- ++blocks;
-
- jpeg_write_raw_data(&cinfo, ptrs, max_lines);
- }
- jpeg_finish_compress(&cinfo);
- jpeg_destroy_compress(&cinfo);
+ qscale_save_jpeg_to_stdio(scaled, stdout, jpeg_quality, SEQUENTIAL);
return 0;
}