| // ========================================================== |
| // 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 RGB16 |
| // ---------------------------------------------------------- |
| |
| FIBITMAP * DLL_CALLCONV |
| FreeImage_ConvertToRGB16(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: |
| { |
| // convert to 24-bit if needed |
| if((FreeImage_GetBPP(dib) == 24) || (FreeImage_GetBPP(dib) == 32)) { |
| src = dib; |
| } else { |
| src = FreeImage_ConvertTo24Bits(dib); |
| if(!src) return NULL; |
| } |
| break; |
| } |
| case FIT_UINT16: |
| // allow conversion from unsigned 16-bit |
| src = dib; |
| break; |
| case FIT_RGB16: |
| // RGB16 type : clone the src |
| return FreeImage_Clone(dib); |
| break; |
| case FIT_RGBA16: |
| // allow conversion from 64-bit RGBA (ignore the alpha channel) |
| src = dib; |
| break; |
| default: |
| return NULL; |
| } |
| |
| // allocate dst image |
| |
| const unsigned width = FreeImage_GetWidth(src); |
| const unsigned height = FreeImage_GetHeight(src); |
| |
| dst = FreeImage_AllocateT(FIT_RGB16, 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 RGB16 |
| |
| switch(src_type) { |
| case FIT_BITMAP: |
| { |
| // Calculate the number of bytes per pixel (1 for 8-bit, 3 for 24-bit or 4 for 32-bit) |
| const unsigned bytespp = FreeImage_GetLine(src) / FreeImage_GetWidth(src); |
| |
| for(unsigned y = 0; y < height; y++) { |
| const BYTE *src_bits = (BYTE*)FreeImage_GetScanLine(src, y); |
| FIRGB16 *dst_bits = (FIRGB16*)FreeImage_GetScanLine(dst, y); |
| for(unsigned x = 0; x < width; x++) { |
| dst_bits[x].red = src_bits[FI_RGBA_RED] << 8; |
| dst_bits[x].green = src_bits[FI_RGBA_GREEN] << 8; |
| dst_bits[x].blue = src_bits[FI_RGBA_BLUE] << 8; |
| src_bits += bytespp; |
| } |
| } |
| } |
| break; |
| |
| case FIT_UINT16: |
| { |
| for(unsigned y = 0; y < height; y++) { |
| const WORD *src_bits = (WORD*)FreeImage_GetScanLine(src, y); |
| FIRGB16 *dst_bits = (FIRGB16*)FreeImage_GetScanLine(dst, y); |
| for(unsigned x = 0; x < width; x++) { |
| // convert by copying greyscale channel to each R, G, B channels |
| dst_bits[x].red = src_bits[x]; |
| dst_bits[x].green = src_bits[x]; |
| dst_bits[x].blue = src_bits[x]; |
| } |
| } |
| } |
| break; |
| |
| case FIT_RGBA16: |
| { |
| for(unsigned y = 0; y < height; y++) { |
| const FIRGBA16 *src_bits = (FIRGBA16*)FreeImage_GetScanLine(src, y); |
| FIRGB16 *dst_bits = (FIRGB16*)FreeImage_GetScanLine(dst, y); |
| for(unsigned x = 0; x < width; x++) { |
| // convert and skip alpha channel |
| dst_bits[x].red = src_bits[x].red; |
| dst_bits[x].green = src_bits[x].green; |
| dst_bits[x].blue = src_bits[x].blue; |
| } |
| } |
| } |
| break; |
| |
| default: |
| break; |
| } |
| |
| if(src != dib) { |
| FreeImage_Unload(src); |
| } |
| |
| return dst; |
| } |
| |