+ png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
+ if (fp)
+ fclose(fp);
+ return (retval);
+}
+
+
+static bool save_image(const char *file_name)
+{
+ char *ptr = strrchr(file_name, '.');
+ if (ptr)
+ {
+ if (stricmp(ptr+1, "png") == 0)
+ return save_png(file_name);
+ }
+
+ STUBBED("Unsupported image type");
+ return false;
+}
+
+
+static bool save_png(const char *file_name)
+{
+ FILE *fp = NULL;
+ png_structp png_ptr = NULL;
+ png_infop info_ptr = NULL;
+ bool retval = false;
+
+ fp = fopen(file_name, "wb");
+ if (fp == NULL)
+ return false;
+
+ png_bytep *row_pointers = new png_bytep[kContextHeight];
+ png_bytep screenshot = new png_byte[kContextWidth * kContextHeight * 3];
+ if ((!screenshot) || (!row_pointers))
+ goto save_png_done;
+
+ glGetError();
+ glReadPixels(0, 0, kContextWidth, kContextHeight,
+ GL_RGB, GL_UNSIGNED_BYTE, screenshot);
+ if (glGetError() != GL_NO_ERROR)
+ goto save_png_done;
+
+ for (int i = 0; i < kContextHeight; i++)
+ row_pointers[i] = screenshot + ((kContextWidth * ((kContextHeight-1) - i)) * 3);
+
+ png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+ if (png_ptr == NULL)
+ goto save_png_done;
+
+ info_ptr = png_create_info_struct(png_ptr);
+ if (info_ptr == NULL)
+ goto save_png_done;
+
+ if (setjmp(png_jmpbuf(png_ptr)))
+ goto save_png_done;
+
+ png_init_io(png_ptr, fp);
+
+ if (setjmp(png_jmpbuf(png_ptr)))
+ goto save_png_done;
+
+ png_set_IHDR(png_ptr, info_ptr, kContextWidth, kContextHeight,
+ 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
+ PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+
+ png_write_info(png_ptr, info_ptr);
+
+ if (setjmp(png_jmpbuf(png_ptr)))
+ goto save_png_done;
+
+ png_write_image(png_ptr, row_pointers);
+
+ if (setjmp(png_jmpbuf(png_ptr)))
+ goto save_png_done;
+
+ png_write_end(png_ptr, NULL);
+ retval = true;
+
+save_png_done:
+ png_destroy_write_struct(&png_ptr, &info_ptr);
+ delete[] screenshot;
+ delete[] row_pointers;
+ if (fp)
+ fclose(fp);
+ if (!retval)
+ unlink(ConvertFileName(file_name));
+ return retval;