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// ==========================================================
// Upsampling / downsampling routine
//
// Design and implementation by
// - Hervé Drolon (drolon@infonie.fr)
// - Carsten Klein (cklein05@users.sourceforge.net)
//
// This file is part of FreeImage 3
//
// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
// THIS DISCLAIMER.
//
// Use at your own risk!
// ==========================================================
#include "Resize.h"
FIBITMAP * DLL_CALLCONV
FreeImage_Rescale(FIBITMAP *src, int dst_width, int dst_height, FREE_IMAGE_FILTER filter) {
FIBITMAP *dst = NULL;
if (!FreeImage_HasPixels(src) || (dst_width <= 0) || (dst_height <= 0) || (FreeImage_GetWidth(src) <= 0) || (FreeImage_GetHeight(src) <= 0)) {
return NULL;
}
// select the filter
CGenericFilter *pFilter = NULL;
switch (filter) {
case FILTER_BOX:
pFilter = new(std::nothrow) CBoxFilter();
break;
case FILTER_BICUBIC:
pFilter = new(std::nothrow) CBicubicFilter();
break;
case FILTER_BILINEAR:
pFilter = new(std::nothrow) CBilinearFilter();
break;
case FILTER_BSPLINE:
pFilter = new(std::nothrow) CBSplineFilter();
break;
case FILTER_CATMULLROM:
pFilter = new(std::nothrow) CCatmullRomFilter();
break;
case FILTER_LANCZOS3:
pFilter = new(std::nothrow) CLanczos3Filter();
break;
}
if (!pFilter) {
return NULL;
}
CResizeEngine Engine(pFilter);
dst = Engine.scale(src, dst_width, dst_height, 0, 0,
FreeImage_GetWidth(src), FreeImage_GetHeight(src));
delete pFilter;
// copy metadata from src to dst
FreeImage_CloneMetadata(dst, src);
return dst;
}
FIBITMAP * DLL_CALLCONV
FreeImage_MakeThumbnail(FIBITMAP *dib, int max_pixel_size, BOOL convert) {
FIBITMAP *thumbnail = NULL;
int new_width, new_height;
if(!FreeImage_HasPixels(dib) || (max_pixel_size <= 0)) return NULL;
int width = FreeImage_GetWidth(dib);
int height = FreeImage_GetHeight(dib);
if(max_pixel_size == 0) max_pixel_size = 1;
if((width < max_pixel_size) && (height < max_pixel_size)) {
// image is smaller than the requested thumbnail
return FreeImage_Clone(dib);
}
if(width > height) {
new_width = max_pixel_size;
// change image height with the same ratio
double ratio = ((double)new_width / (double)width);
new_height = (int)(height * ratio + 0.5);
if(new_height == 0) new_height = 1;
} else {
new_height = max_pixel_size;
// change image width with the same ratio
double ratio = ((double)new_height / (double)height);
new_width = (int)(width * ratio + 0.5);
if(new_width == 0) new_width = 1;
}
const FREE_IMAGE_TYPE image_type = FreeImage_GetImageType(dib);
// perform downsampling using a bilinear interpolation
switch(image_type) {
case FIT_BITMAP:
case FIT_UINT16:
case FIT_RGB16:
case FIT_RGBA16:
case FIT_FLOAT:
case FIT_RGBF:
case FIT_RGBAF:
{
FREE_IMAGE_FILTER filter = FILTER_BILINEAR;
thumbnail = FreeImage_Rescale(dib, new_width, new_height, filter);
}
break;
case FIT_INT16:
case FIT_UINT32:
case FIT_INT32:
case FIT_DOUBLE:
case FIT_COMPLEX:
default:
// cannot rescale this kind of image
thumbnail = NULL;
break;
}
if((thumbnail != NULL) && (image_type != FIT_BITMAP) && convert) {
// convert to a standard bitmap
FIBITMAP *bitmap = NULL;
switch(image_type) {
case FIT_UINT16:
bitmap = FreeImage_ConvertTo8Bits(thumbnail);
break;
case FIT_RGB16:
bitmap = FreeImage_ConvertTo24Bits(thumbnail);
break;
case FIT_RGBA16:
bitmap = FreeImage_ConvertTo32Bits(thumbnail);
break;
case FIT_FLOAT:
bitmap = FreeImage_ConvertToStandardType(thumbnail, TRUE);
break;
case FIT_RGBF:
bitmap = FreeImage_ToneMapping(thumbnail, FITMO_DRAGO03);
break;
case FIT_RGBAF:
// no way to keep the transparency yet ...
FIBITMAP *rgbf = FreeImage_ConvertToRGBF(thumbnail);
bitmap = FreeImage_ToneMapping(rgbf, FITMO_DRAGO03);
FreeImage_Unload(rgbf);
break;
}
if(bitmap != NULL) {
FreeImage_Unload(thumbnail);
thumbnail = bitmap;
}
}
// copy metadata from src to dst
FreeImage_CloneMetadata(thumbnail, dib);
return thumbnail;
}
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