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// ==========================================================
// Bitmap conversion routines
//
// Design and implementation by
// - Hervé 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 "../stdafx.h"
// ----------------------------------------------------------
// smart convert X to RGBF
// ----------------------------------------------------------
FIBITMAP * DLL_CALLCONV
FreeImage_ConvertToRGBF(FIBITMAP *dib) {
FIBITMAP *src = NULL;
FIBITMAP *dst = NULL;
if(!FreeImage_HasPixels(dib)) return NULL;
const FREE_IMAGE_TYPE src_type = FreeImage_GetImageType(dib);
// check for allowed conversions
switch(src_type) {
case FIT_BITMAP:
{
// allow conversion from 24- and 32-bit
const FREE_IMAGE_COLOR_TYPE color_type = FreeImage_GetColorType(dib);
if((color_type != FIC_RGB) && (color_type != FIC_RGBALPHA)) {
src = FreeImage_ConvertTo24Bits(dib);
if(!src) return NULL;
} else {
src = dib;
}
break;
}
case FIT_UINT16:
// allow conversion from 16-bit
src = dib;
break;
case FIT_RGB16:
// allow conversion from 48-bit RGB
src = dib;
break;
case FIT_RGBA16:
// allow conversion from 64-bit RGBA (ignore the alpha channel)
src = dib;
break;
case FIT_FLOAT:
// allow conversion from 32-bit float
src = dib;
break;
case FIT_RGBAF:
// allow conversion from 128-bit RGBAF
src = dib;
break;
case FIT_RGBF:
// RGBF type : clone the src
return FreeImage_Clone(dib);
break;
default:
return NULL;
}
// allocate dst image
const unsigned width = FreeImage_GetWidth(src);
const unsigned height = FreeImage_GetHeight(src);
dst = FreeImage_AllocateT(FIT_RGBF, 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 RGBF
const unsigned src_pitch = FreeImage_GetPitch(src);
const unsigned dst_pitch = FreeImage_GetPitch(dst);
switch(src_type) {
case FIT_BITMAP:
{
// calculate the number of bytes per pixel (3 for 24-bit or 4 for 32-bit)
const unsigned bytespp = FreeImage_GetLine(src) / FreeImage_GetWidth(src);
const uint8_t *src_bits = (uint8_t*)FreeImage_GetBits(src);
uint8_t *dst_bits = (uint8_t*)FreeImage_GetBits(dst);
for(unsigned y = 0; y < height; y++) {
const uint8_t *src_pixel = (uint8_t*)src_bits;
FIRGBF *dst_pixel = (FIRGBF*)dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert and scale to the range [0..1]
dst_pixel->red = (float)(src_pixel[FI_RGBA_RED]) / 255.0F;
dst_pixel->green = (float)(src_pixel[FI_RGBA_GREEN]) / 255.0F;
dst_pixel->blue = (float)(src_pixel[FI_RGBA_BLUE]) / 255.0F;
src_pixel += bytespp;
dst_pixel ++;
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
}
break;
case FIT_UINT16:
{
const uint8_t *src_bits = (uint8_t*)FreeImage_GetBits(src);
uint8_t *dst_bits = (uint8_t*)FreeImage_GetBits(dst);
for(unsigned y = 0; y < height; y++) {
const WORD *src_pixel = (WORD*)src_bits;
FIRGBF *dst_pixel = (FIRGBF*)dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert and scale to the range [0..1]
const float dst_value = (float)src_pixel[x] / 65535.0F;
dst_pixel[x].red = dst_value;
dst_pixel[x].green = dst_value;
dst_pixel[x].blue = dst_value;
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
}
break;
case FIT_RGB16:
{
const uint8_t *src_bits = (uint8_t*)FreeImage_GetBits(src);
uint8_t *dst_bits = (uint8_t*)FreeImage_GetBits(dst);
for(unsigned y = 0; y < height; y++) {
const FIRGB16 *src_pixel = (FIRGB16*) src_bits;
FIRGBF *dst_pixel = (FIRGBF*) dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert and scale to the range [0..1]
dst_pixel[x].red = (float)(src_pixel[x].red) / 65535.0F;
dst_pixel[x].green = (float)(src_pixel[x].green) / 65535.0F;
dst_pixel[x].blue = (float)(src_pixel[x].blue) / 65535.0F;
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
}
break;
case FIT_RGBA16:
{
const uint8_t *src_bits = (uint8_t*)FreeImage_GetBits(src);
uint8_t *dst_bits = (uint8_t*)FreeImage_GetBits(dst);
for(unsigned y = 0; y < height; y++) {
const FIRGBA16 *src_pixel = (FIRGBA16*) src_bits;
FIRGBF *dst_pixel = (FIRGBF*) dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert and scale to the range [0..1]
dst_pixel[x].red = (float)(src_pixel[x].red) / 65535.0F;
dst_pixel[x].green = (float)(src_pixel[x].green) / 65535.0F;
dst_pixel[x].blue = (float)(src_pixel[x].blue) / 65535.0F;
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
}
break;
case FIT_FLOAT:
{
const uint8_t *src_bits = (uint8_t*)FreeImage_GetBits(src);
uint8_t *dst_bits = (uint8_t*)FreeImage_GetBits(dst);
for(unsigned y = 0; y < height; y++) {
const float *src_pixel = (float*) src_bits;
FIRGBF *dst_pixel = (FIRGBF*) dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert by copying greyscale channel to each R, G, B channels
// assume float values are in [0..1]
const float value = CLAMP(src_pixel[x], 0.0F, 1.0F);
dst_pixel[x].red = value;
dst_pixel[x].green = value;
dst_pixel[x].blue = value;
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
}
break;
case FIT_RGBAF:
{
const uint8_t *src_bits = (uint8_t*)FreeImage_GetBits(src);
uint8_t *dst_bits = (uint8_t*)FreeImage_GetBits(dst);
for(unsigned y = 0; y < height; y++) {
const FIRGBAF *src_pixel = (FIRGBAF*) src_bits;
FIRGBF *dst_pixel = (FIRGBF*) dst_bits;
for(unsigned x = 0; x < width; x++) {
// convert and skip alpha channel
dst_pixel[x].red = CLAMP(src_pixel[x].red, 0.0F, 1.0F);
dst_pixel[x].green = CLAMP(src_pixel[x].green, 0.0F, 1.0F);
dst_pixel[x].blue = CLAMP(src_pixel[x].blue, 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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