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// ==========================================================
// Bitmap conversion routines
//
// 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 "FreeImage.h"
#include "Utilities.h"
// ----------------------------------------------------------
// smart convert X to Float
// ----------------------------------------------------------
FIBITMAP * DLL_CALLCONV
FreeImage_ConvertToFloat(FIBITMAP *dib) {
FIBITMAP *src = NULL;
FIBITMAP *dst = NULL;
if(!FreeImage_HasPixels(dib)) return NULL;
FREE_IMAGE_TYPE src_type = FreeImage_GetImageType(dib);
// check for allowed conversions
switch(src_type) {
case FIT_BITMAP:
{
// allow conversion from 8-bit
if((FreeImage_GetBPP(dib) == 8) && (FreeImage_GetColorType(dib) == FIC_MINISBLACK)) {
src = dib;
} else {
src = FreeImage_ConvertToGreyscale(dib);
if(!src) return NULL;
}
break;
}
case FIT_UINT16:
case FIT_RGB16:
case FIT_RGBA16:
case FIT_RGBF:
case FIT_RGBAF:
src = dib;
break;
case FIT_FLOAT:
// float type : clone the src
return FreeImage_Clone(dib);
default:
return NULL;
}
// allocate dst image
const unsigned width = FreeImage_GetWidth(src);
const unsigned height = FreeImage_GetHeight(src);
dst = FreeImage_AllocateT(FIT_FLOAT, width, height);
if(!dst) {
if(src != dib) {
FreeImage_Unload(src);
}
return NULL;
}
// copy metadata from src to dst
FreeImage_CloneMetadata(dst, src);
// convert from src type to float
const unsigned src_pitch = FreeImage_GetPitch(src);
const unsigned dst_pitch = FreeImage_GetPitch(dst);
const BYTE *src_bits = (BYTE*)FreeImage_GetBits(src);
BYTE *dst_bits = (BYTE*)FreeImage_GetBits(dst);
switch(src_type) {
case FIT_BITMAP:
{
for(unsigned y = 0; y < height; y++) {
const BYTE *src_pixel = (BYTE*)src_bits;
float *dst_pixel = (float*)dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert and scale to the range [0..1]
dst_pixel[x] = (float)(src_pixel[x]) / 255;
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
}
break;
case FIT_UINT16:
{
for(unsigned y = 0; y < height; y++) {
const WORD *src_pixel = (WORD*)src_bits;
float *dst_pixel = (float*)dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert and scale to the range [0..1]
dst_pixel[x] = (float)(src_pixel[x]) / 65535;
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
}
break;
case FIT_RGB16:
{
for(unsigned y = 0; y < height; y++) {
const FIRGB16 *src_pixel = (FIRGB16*)src_bits;
float *dst_pixel = (float*)dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert and scale to the range [0..1]
dst_pixel[x] = LUMA_REC709(src_pixel[x].red, src_pixel[x].green, src_pixel[x].blue) / 65535.0F;
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
}
break;
case FIT_RGBA16:
{
for(unsigned y = 0; y < height; y++) {
const FIRGBA16 *src_pixel = (FIRGBA16*)src_bits;
float *dst_pixel = (float*)dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert and scale to the range [0..1]
dst_pixel[x] = LUMA_REC709(src_pixel[x].red, src_pixel[x].green, src_pixel[x].blue) / 65535.0F;
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
}
break;
case FIT_RGBF:
{
for(unsigned y = 0; y < height; y++) {
const FIRGBF *src_pixel = (FIRGBF*)src_bits;
float *dst_pixel = (float*)dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert (assume pixel values are in the range [0..1])
dst_pixel[x] = LUMA_REC709(src_pixel[x].red, src_pixel[x].green, src_pixel[x].blue);
dst_pixel[x] = CLAMP(dst_pixel[x], 0.0F, 1.0F);
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
}
break;
case FIT_RGBAF:
{
for(unsigned y = 0; y < height; y++) {
const FIRGBAF *src_pixel = (FIRGBAF*)src_bits;
float *dst_pixel = (float*)dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert (assume pixel values are in the range [0..1])
dst_pixel[x] = LUMA_REC709(src_pixel[x].red, src_pixel[x].green, src_pixel[x].blue);
dst_pixel[x] = CLAMP(dst_pixel[x], 0.0F, 1.0F);
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
}
break;
}
if(src != dib) {
FreeImage_Unload(src);
}
return dst;
}
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