static gboolean
take_screenshot (void *user_data, char *fname)
{
Viewer *self = (Viewer*) user_data;
int w = GTK_WIDGET (self->gl_area)->allocation.width;
int h = GTK_WIDGET (self->gl_area)->allocation.height;
uint8_t *bgra = (uint8_t*)malloc (w*h*4);
uint8_t *rgb = (uint8_t*)malloc (w*h*3);
glReadPixels (0, 0, w, h, GL_BGRA, GL_UNSIGNED_BYTE, bgra);
FILE *fp = fopen (fname, "wb");
if (! fp) {
perror ("fopen");
err ("couldn't take screenshot\n");
return FALSE;
} else {
pixel_convert_8u_bgra_to_8u_rgb (rgb, w*3, w, h, bgra, w*4);
ppm_write_bottom_up (fp, rgb, w, h, w*3);
fclose (fp);
dbg ("screenshot saved to %s\n", fname);
viewer_set_status_bar_message (self, "screenshot saved to %s", fname);
}
free (bgra);
free (rgb);
return TRUE;
}
int
jpeg_compress_8u_bgra (const uint8_t * src, int width, int height, int stride,
uint8_t * dest, int * destsize, int quality)
{
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
struct jpeg_destination_mgr jdest;
int out_size = *destsize;
cinfo.err = jpeg_std_error (&jerr);
jpeg_create_compress (&cinfo);
jdest.next_output_byte = dest;
jdest.free_in_buffer = out_size;
jdest.init_destination = init_destination;
jdest.empty_output_buffer = empty_output_buffer;
jdest.term_destination = term_destination;
cinfo.dest = &jdest;
cinfo.image_width = width;
cinfo.image_height = height;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults (&cinfo);
jpeg_set_quality (&cinfo, quality, TRUE);
jpeg_start_compress (&cinfo, TRUE);
while (cinfo.next_scanline < height) {
uint8_t buf[width*3];
pixel_convert_8u_bgra_to_8u_rgb (buf, 0, width, 1,
src + cinfo.next_scanline * stride, 0);
JSAMPROW row = (JSAMPROW) buf;
jpeg_write_scanlines (&cinfo, &row, 1);
}
jpeg_finish_compress (&cinfo);
*destsize = out_size - jdest.free_in_buffer;
jpeg_destroy_compress (&cinfo);
return 0;
}
