/src/FreeImage/Source/FreeImage/ConversionFloat.cpp
https://bitbucket.org/cabalistic/ogredeps/ · C++ · 192 lines · 130 code · 27 blank · 35 comment · 26 complexity · 1487a7a054814e8fe8edf26eb59c9b55 MD5 · raw file
- // ==========================================================
- // 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 "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);
- }
- 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);
- }
- src_bits += src_pitch;
- dst_bits += dst_pitch;
- }
- }
- break;
- }
- if(src != dib) {
- FreeImage_Unload(src);
- }
- return dst;
- }