84 int writepng_init(mainprog_info *mainprog_ptr)  in writepng_init()  argument
93     png_ptr = png_create_write_struct(png_get_libpng_ver(NULL), mainprog_ptr,  in writepng_init()
111     if (setjmp(mainprog_ptr->jmpbuf)) {  in writepng_init()
119     png_init_io(png_ptr, mainprog_ptr->outfile);  in writepng_init()
142     if (mainprog_ptr->pnmtype == 5)  in writepng_init()
144     else if (mainprog_ptr->pnmtype == 6)  in writepng_init()
146     else if (mainprog_ptr->pnmtype == 8)  in writepng_init()
153     interlace_type = mainprog_ptr->interlaced? PNG_INTERLACE_ADAM7 :  in writepng_init()
156     png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height,  in writepng_init()
157       mainprog_ptr->sample_depth, color_type, interlace_type,  in writepng_init()
160     if (mainprog_ptr->gamma > 0.0)  in writepng_init()
161         png_set_gAMA(png_ptr, info_ptr, mainprog_ptr->gamma);  in writepng_init()
163     if (mainprog_ptr->have_bg) {   /* we know it's RGBA, not gray+alpha */  in writepng_init()
166         background.red = mainprog_ptr->bg_red;  in writepng_init()
167         background.green = mainprog_ptr->bg_green;  in writepng_init()
168         background.blue = mainprog_ptr->bg_blue;  in writepng_init()
172     if (mainprog_ptr->have_time) {  in writepng_init()
175         png_convert_from_time_t(&modtime, mainprog_ptr->modtime);  in writepng_init()
179     if (mainprog_ptr->have_text) {  in writepng_init()
183         if (mainprog_ptr->have_text & TEXT_TITLE) {  in writepng_init()
186             text[num_text].text = mainprog_ptr->title;  in writepng_init()
189         if (mainprog_ptr->have_text & TEXT_AUTHOR) {  in writepng_init()
192             text[num_text].text = mainprog_ptr->author;  in writepng_init()
195         if (mainprog_ptr->have_text & TEXT_DESC) {  in writepng_init()
198             text[num_text].text = mainprog_ptr->desc;  in writepng_init()
201         if (mainprog_ptr->have_text & TEXT_COPY) {  in writepng_init()
204             text[num_text].text = mainprog_ptr->copyright;  in writepng_init()
207         if (mainprog_ptr->have_text & TEXT_EMAIL) {  in writepng_init()
210             text[num_text].text = mainprog_ptr->email;  in writepng_init()
213         if (mainprog_ptr->have_text & TEXT_URL) {  in writepng_init()
216             text[num_text].text = mainprog_ptr->url;  in writepng_init()
244     mainprog_ptr->png_ptr = png_ptr;  in writepng_init()
245     mainprog_ptr->info_ptr = info_ptr;  in writepng_init()
259 int writepng_encode_image(mainprog_info *mainprog_ptr)  in writepng_encode_image()  argument
261     png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;  in writepng_encode_image()
262     png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;  in writepng_encode_image()
268     if (setjmp(mainprog_ptr->jmpbuf)) {  in writepng_encode_image()
270         mainprog_ptr->png_ptr = NULL;  in writepng_encode_image()
271         mainprog_ptr->info_ptr = NULL;  in writepng_encode_image()
279     png_write_image(png_ptr, mainprog_ptr->row_pointers);  in writepng_encode_image()
297 int writepng_encode_row(mainprog_info *mainprog_ptr)  /* NON-interlaced only! */  in writepng_encode_row()  argument
299     png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;  in writepng_encode_row()
300     png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;  in writepng_encode_row()
306     if (setjmp(mainprog_ptr->jmpbuf)) {  in writepng_encode_row()
308         mainprog_ptr->png_ptr = NULL;  in writepng_encode_row()
309         mainprog_ptr->info_ptr = NULL;  in writepng_encode_row()
316     png_write_row(png_ptr, mainprog_ptr->image_data);  in writepng_encode_row()
327 int writepng_encode_finish(mainprog_info *mainprog_ptr)   /* NON-interlaced! */  in writepng_encode_finish()  argument
329     png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;  in writepng_encode_finish()
330     png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;  in writepng_encode_finish()
336     if (setjmp(mainprog_ptr->jmpbuf)) {  in writepng_encode_finish()
338         mainprog_ptr->png_ptr = NULL;  in writepng_encode_finish()
339         mainprog_ptr->info_ptr = NULL;  in writepng_encode_finish()
356 void writepng_cleanup(mainprog_info *mainprog_ptr)  in writepng_cleanup()  argument
358     png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;  in writepng_cleanup()
359     png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;  in writepng_cleanup()
371     mainprog_info  *mainprog_ptr;  in writepng_error_handler()  local
385     mainprog_ptr = png_get_error_ptr(png_ptr);  in writepng_error_handler()
386     if (mainprog_ptr == NULL) {         /* we are completely hosed now */  in writepng_error_handler()
400     longjmp(mainprog_ptr->jmpbuf, 1);  in writepng_error_handler()