bool GdImageRenderer::saveAsPng(
const char* filename,
const int compression_level) const
{
bool success = true;
FILE* output_file = fopen(filename, "wb");
if (output_file != nullptr) {
output_stream << "Writing PNG file: " << filename << '\n';
gdImagePngEx(image_, output_file, compression_level);
fclose(output_file);
output_file = nullptr;
}
else {
error_stream << "Failed to write PNG file: " << filename << '\n'
<< strerror(errno) << '\n';
success = false;
}
return success;
}
int fswc_output(fswebcam_config_t *config, char *name, gdImage *image)
{
char filename[FILENAME_MAX];
gdImage *im;
FILE *f;
if(!name) return(-1);
if(!strncmp(name, "-", 2) && config->background)
{
ERROR("stdout is unavailable in background mode.");
return(-1);
}
fswc_strftime(filename, FILENAME_MAX, name,
config->start, config->gmt);
/* Create a temporary image buffer. */
im = fswc_gdImageDuplicate(image);
if(!im)
{
ERROR("Out of memory.");
return(-1);
}
/* Draw the underlay. */
fswc_draw_overlay(config, config->underlay, im);
/* Draw the banner. */
if(config->banner != NO_BANNER)
{
char *err;
/* Check if drawing text works */
err = gdImageStringFT(NULL, NULL, 0, config->font, config->fontsize, 0.0, 0, 0, "");
if(!err) fswc_draw_banner(config, im);
else
{
/* Can't load the font - display a warning */
WARN("Unable to load font '%s': %s", config->font, err);
WARN("Disabling the the banner.");
}
}
/* Draw the overlay. */
fswc_draw_overlay(config, config->overlay, im);
/* Write to a file if a filename was given, otherwise stdout. */
if(strncmp(name, "-", 2)) f = fopen(filename, "wb");
else f = stdout;
if(!f)
{
ERROR("Error opening file for output: %s", filename);
ERROR("fopen: %s", strerror(errno));
gdImageDestroy(im);
return(-1);
}
/* Write the compressed image. */
switch(config->format)
{
case FORMAT_JPEG:
MSG("Writing JPEG image to '%s'.", filename);
gdImageJpeg(im, f, config->compression);
break;
case FORMAT_PNG:
MSG("Writing PNG image to '%s'.", filename);
gdImagePngEx(im, f, config->compression);
break;
}
if(f != stdout) fclose(f);
gdImageDestroy(im);
return(0);
}