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// ==========================================================
// Upsampling / downsampling routine
//
// Design and implementation by
// - Herv Drolon (drolon@infonie.fr)
//
// 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 (!src || (dst_width <= 0) || (dst_height <= 0)) {
return NULL;
}
// select the filter
CGenericFilter *pFilter = NULL;
switch(filter) {
case FILTER_BOX:
pFilter = new CBoxFilter();
break;
case FILTER_BICUBIC:
pFilter = new CBicubicFilter();
break;
case FILTER_BILINEAR:
pFilter = new CBilinearFilter();
break;
case FILTER_BSPLINE:
pFilter = new CBSplineFilter();
break;
case FILTER_CATMULLROM:
pFilter = new CCatmullRomFilter();
break;
case FILTER_LANCZOS3:
pFilter = new CLanczos3Filter();
break;
}
CResizeEngine Engine(pFilter);
// perform upsampling or downsampling
if((FreeImage_GetBPP(src) == 4) || (FreeImage_GetColorType(src) == FIC_PALETTE)) {
// special case for 4-bit images or color map indexed images ...
if(FreeImage_IsTransparent(src) == FALSE) {
FIBITMAP *src24 = NULL;
FIBITMAP *dst24 = NULL;
try {
// transparent conversion to 24-bit (any transparency table will be destroyed)
src24 = FreeImage_ConvertTo24Bits(src);
if(!src24) throw(1);
// perform upsampling or downsampling
dst24 = Engine.scale(src24, dst_width, dst_height);
if(!dst24) throw(1);
// color quantize to 8-bit
dst = FreeImage_ColorQuantize(dst24, FIQ_WUQUANT);
// free and return
FreeImage_Unload(src24);
FreeImage_Unload(dst24);
} catch(int) {
if(src24) FreeImage_Unload(src24);
if(dst24) FreeImage_Unload(dst24);
}
} else {
FIBITMAP *src32 = NULL;
try {
// transparent conversion to 32-bit (keep transparency)
src32 = FreeImage_ConvertTo32Bits(src);
if(!src32) throw(1);
// perform upsampling or downsampling
dst = Engine.scale(src32, dst_width, dst_height);
if(!dst) throw(1);
// free and return
FreeImage_Unload(src32);
} catch(int) {
if(src32) FreeImage_Unload(src32);
if(dst) FreeImage_Unload(dst);
}
}
}
else if((FreeImage_GetBPP(src) == 16) && (FreeImage_GetImageType(src) == FIT_BITMAP)) {
// convert 16-bit RGB to 24-bit
FIBITMAP *src24 = NULL;
try {
// transparent conversion to 24-bit (any transparency table will be destroyed)
src24 = FreeImage_ConvertTo24Bits(src);
if(!src24) throw(1);
// perform upsampling or downsampling
dst = Engine.scale(src24, dst_width, dst_height);
if(!dst) throw(1);
// free and return
FreeImage_Unload(src24);
} catch(int) {
if(src24) FreeImage_Unload(src24);
if(dst) FreeImage_Unload(dst);
}
}
else {
// normal case :
// 1- or 8-bit greyscale, 24- or 32-bit RGB(A) images
// 16-bit greyscale, 48- or 64-bit RGB(A) images
// 32-bit float, 96- or 128-bit RGB(A) float images
dst = Engine.scale(src, dst_width, dst_height);
}
delete pFilter;
return dst;
}
FIBITMAP * DLL_CALLCONV
FreeImage_MakeThumbnail(FIBITMAP *dib, int max_pixel_size, BOOL convert) {
FIBITMAP *thumbnail = NULL;
int new_width, new_height;
if(!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;
}
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;
}
}
return thumbnail;
}
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