int imFileReadImageData(imFile* ifile, void* data, int convert2bitmap, int color_mode_flags)
{
assert(ifile);
assert(!ifile->is_new);
imFileFormatBase* ifileformat = (imFileFormatBase*)ifile;
if (ifile->image_index == -1)
return IM_ERR_DATA;
ifile->user_color_mode = ifile->file_color_mode;
ifile->user_data_type = ifile->file_data_type;
if (convert2bitmap)
{
ifile->user_data_type = IM_BYTE;
ifile->user_color_mode = imColorModeToBitmap(ifile->file_color_mode);
}
if (color_mode_flags != -1)
{
ifile->user_color_mode = imColorModeSpace(ifile->user_color_mode);
ifile->user_color_mode |= color_mode_flags;
}
if (!imImageCheckFormat(ifile->user_color_mode, ifile->user_data_type))
return IM_ERR_DATA;
if (!imFileCheckConversion(ifile))
return IM_ERR_DATA;
imFileLineBufferInit(ifile);
int ret = ifileformat->ReadImageData(data);
// here we can NOT change the file_color_mode we already returned to the user
// so just check for gray and binary consistency
if (imColorModeSpace(ifile->file_color_mode) == IM_GRAY && ifile->file_data_type == IM_BYTE)
iFileCheckConvertGray(ifile, (imbyte*)data);
if (imColorModeSpace(ifile->file_color_mode) == IM_BINARY)
iFileCheckConvertBinary(ifile, (imbyte*)data);
return ret;
}
/*****************************************************************************\
im.ColorModeToBitmap(color_mode)
\*****************************************************************************/
static int imluaColorModeToBitmap (lua_State *L)
{
lua_pushinteger(L, imColorModeToBitmap(luaL_checkinteger(L, 1)));
return 1;
}
int imLoadRGB(char *filename, unsigned char *red, unsigned char *green, unsigned char *blue)
{
int error;
imFile* ifile = imFileOpen(filename, &error);
if (!ifile) return error;
int width, height, color_mode, data_type;
error = imFileReadImageInfo(ifile, 0, &width, &height, &color_mode, &data_type);
if (error)
{
imFileClose(ifile);
return error;
}
if (iOldResolutionCB)
{
double xres = *(float*)imFileGetAttribute(ifile, "XResolution", NULL, NULL);
double yres = *(float*)imFileGetAttribute(ifile, "YResolution", NULL, NULL);
int res_unit = *(int*)imFileGetAttribute(ifile, "ResolutionUnit", NULL, NULL);
iOldResolutionCB(filename, &xres, &yres, &res_unit);
}
if (iOldTiffImageDescCB)
{
char* img_desc = (char*)imFileGetAttribute(ifile, "Description", NULL, NULL);
iOldTiffImageDescCB(filename, img_desc);
}
if (iOldGifTranspIndexCB)
{
unsigned char transp_index = *(unsigned char*)imFileGetAttribute(ifile, "TransparencyIndex", NULL, NULL);
iOldGifTranspIndexCB(filename, &transp_index);
}
int count = width*height;
void* data;
if (green != red + count || blue != green + count)
data = malloc(imImageDataSize(width, height, IM_RGB, IM_BYTE));
else
data = red;
if (!data)
{
imFileClose(ifile);
return IM_ERR_MEM;
}
if (iOldCounterCB)
imCounterSetCallback(filename, iOldFileCounter);
error = imFileReadImageData(ifile, data, 1, 0);
if (error)
{
if (data != red) free(data);
imFileClose(ifile);
return error;
}
if (imColorModeToBitmap(color_mode) != IM_RGB)
{
long palette[256];
int palette_count;
imFileGetPalette(ifile, palette, &palette_count);
iConvertMapToRGB((imbyte*)data, red, green, blue, count, palette, palette_count);
}
else if (data != red)
{
memcpy(red, data, count);
memcpy(green, (unsigned char*)data+count, count);
memcpy(blue, (unsigned char*)data+2*count, count);
}
imFileClose(ifile);
if (data != red) free(data);
return IM_ERR_NONE;
}
