| // ========================================================== |
| // 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); |
| 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; |
| } |
| |