83 int writepng_init(mainprog_info *mainprog_ptr)  in writepng_init()  argument
92     png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr,  in writepng_init()
109     if (setjmp(mainprog_ptr->jmpbuf)) {  in writepng_init()
117     png_init_io(png_ptr, mainprog_ptr->outfile);  in writepng_init()
140     if (mainprog_ptr->pnmtype == 5)  in writepng_init()
142     else if (mainprog_ptr->pnmtype == 6)  in writepng_init()
144     else if (mainprog_ptr->pnmtype == 8)  in writepng_init()
151     interlace_type = mainprog_ptr->interlaced? PNG_INTERLACE_ADAM7 :  in writepng_init()
154     png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height,  in writepng_init()
155       mainprog_ptr->sample_depth, color_type, interlace_type,  in writepng_init()
158     if (mainprog_ptr->gamma > 0.0)  in writepng_init()
159         png_set_gAMA(png_ptr, info_ptr, mainprog_ptr->gamma);  in writepng_init()
161     if (mainprog_ptr->have_bg) {   /* we know it's RGBA, not gray+alpha */  in writepng_init()
164         background.red = mainprog_ptr->bg_red;  in writepng_init()
165         background.green = mainprog_ptr->bg_green;  in writepng_init()
166         background.blue = mainprog_ptr->bg_blue;  in writepng_init()
170     if (mainprog_ptr->have_time) {  in writepng_init()
173         png_convert_from_time_t(&modtime, mainprog_ptr->modtime);  in writepng_init()
177     if (mainprog_ptr->have_text) {  in writepng_init()
181         if (mainprog_ptr->have_text & TEXT_TITLE) {  in writepng_init()
184             text[num_text].text = mainprog_ptr->title;  in writepng_init()
187         if (mainprog_ptr->have_text & TEXT_AUTHOR) {  in writepng_init()
190             text[num_text].text = mainprog_ptr->author;  in writepng_init()
193         if (mainprog_ptr->have_text & TEXT_DESC) {  in writepng_init()
196             text[num_text].text = mainprog_ptr->desc;  in writepng_init()
199         if (mainprog_ptr->have_text & TEXT_COPY) {  in writepng_init()
202             text[num_text].text = mainprog_ptr->copyright;  in writepng_init()
205         if (mainprog_ptr->have_text & TEXT_EMAIL) {  in writepng_init()
208             text[num_text].text = mainprog_ptr->email;  in writepng_init()
211         if (mainprog_ptr->have_text & TEXT_URL) {  in writepng_init()
214             text[num_text].text = mainprog_ptr->url;  in writepng_init()
242     mainprog_ptr->png_ptr = png_ptr;  in writepng_init()
243     mainprog_ptr->info_ptr = info_ptr;  in writepng_init()
257 int writepng_encode_image(mainprog_info *mainprog_ptr)  in writepng_encode_image()  argument
259     png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;  in writepng_encode_image()
260     png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;  in writepng_encode_image()
266     if (setjmp(mainprog_ptr->jmpbuf)) {  in writepng_encode_image()
268         mainprog_ptr->png_ptr = NULL;  in writepng_encode_image()
269         mainprog_ptr->info_ptr = NULL;  in writepng_encode_image()
277     png_write_image(png_ptr, mainprog_ptr->row_pointers);  in writepng_encode_image()
295 int writepng_encode_row(mainprog_info *mainprog_ptr)  /* NON-interlaced only! */  in writepng_encode_row()  argument
297     png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;  in writepng_encode_row()
298     png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;  in writepng_encode_row()
304     if (setjmp(mainprog_ptr->jmpbuf)) {  in writepng_encode_row()
306         mainprog_ptr->png_ptr = NULL;  in writepng_encode_row()
307         mainprog_ptr->info_ptr = NULL;  in writepng_encode_row()
314     png_write_row(png_ptr, mainprog_ptr->image_data);  in writepng_encode_row()
325 int writepng_encode_finish(mainprog_info *mainprog_ptr)   /* NON-interlaced! */  in writepng_encode_finish()  argument
327     png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;  in writepng_encode_finish()
328     png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;  in writepng_encode_finish()
334     if (setjmp(mainprog_ptr->jmpbuf)) {  in writepng_encode_finish()
336         mainprog_ptr->png_ptr = NULL;  in writepng_encode_finish()
337         mainprog_ptr->info_ptr = NULL;  in writepng_encode_finish()
354 void writepng_cleanup(mainprog_info *mainprog_ptr)  in writepng_cleanup()  argument
356     png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;  in writepng_cleanup()
357     png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;  in writepng_cleanup()
369     mainprog_info  *mainprog_ptr;  in writepng_error_handler()  local
383     mainprog_ptr = png_get_error_ptr(png_ptr);  in writepng_error_handler()
384     if (mainprog_ptr == NULL) {         /* we are completely hosed now */  in writepng_error_handler()
391     longjmp(mainprog_ptr->jmpbuf, 1);  in writepng_error_handler()