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Diffstat (limited to 'Source/FreeImageToolkit/Flip.cpp')
| -rw-r--r-- | Source/FreeImageToolkit/Flip.cpp | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/Source/FreeImageToolkit/Flip.cpp b/Source/FreeImageToolkit/Flip.cpp new file mode 100644 index 0000000..954f1c2 --- /dev/null +++ b/Source/FreeImageToolkit/Flip.cpp @@ -0,0 +1,166 @@ +// ========================================================== +// Flipping routines +// +// Design and implementation by +// - Floris van den Berg (flvdberg@wxs.nl) +// - Hervé Drolon (drolon@infonie.fr) +// - Jim Keir (jimkeir@users.sourceforge.net) +// +// 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" + +/** +Flip the image horizontally along the vertical axis. +@param src Input image to be processed. +@return Returns TRUE if successful, FALSE otherwise. +*/ +BOOL DLL_CALLCONV +FreeImage_FlipHorizontal(FIBITMAP *src) { + if (!src) return FALSE; + + unsigned line = FreeImage_GetLine(src); + unsigned width = FreeImage_GetWidth(src); + unsigned height = FreeImage_GetHeight(src); + + unsigned bytespp = FreeImage_GetLine(src) / FreeImage_GetWidth(src); + + // copy between aligned memories + BYTE *new_bits = (BYTE*)FreeImage_Aligned_Malloc(line * sizeof(BYTE), FIBITMAP_ALIGNMENT); + if (!new_bits) return FALSE; + + // mirror the buffer + + for (unsigned y = 0; y < height; y++) { + BYTE *bits = FreeImage_GetScanLine(src, y); + memcpy(new_bits, bits, line); + + switch (FreeImage_GetBPP(src)) { + case 1 : + { + for(unsigned x = 0; x < width; x++) { + // get pixel at (x, y) + BOOL value = (new_bits[x >> 3] & (0x80 >> (x & 0x07))) != 0; + // set pixel at (new_x, y) + unsigned new_x = width - 1 - x; + value ? bits[new_x >> 3] |= (0x80 >> (new_x & 0x7)) : bits[new_x >> 3] &= (0xff7f >> (new_x & 0x7)); + } + } + break; + + case 4 : + { + for(unsigned c = 0; c < line; c++) { + bits[c] = new_bits[line - c - 1]; + + BYTE nibble = (bits[c] & 0xF0) >> 4; + + bits[c] = bits[c] << 4; + bits[c] |= nibble; + } + } + break; + + case 8: + { + BYTE *dst_data = (BYTE*) bits; + BYTE *src_data = (BYTE*) (new_bits + line - bytespp); + for(unsigned c = 0; c < width; c++) { + *dst_data++ = *src_data--; + } + } + break; + + case 16: + { + WORD *dst_data = (WORD*) bits; + WORD *src_data = (WORD*) (new_bits + line - bytespp); + for(unsigned c = 0; c < width; c++) { + *dst_data++ = *src_data--; + } + } + break; + + case 24 : + case 32 : + case 48: + case 64: + case 96: + case 128: + { + BYTE *dst_data = (BYTE*) bits; + BYTE *src_data = (BYTE*) (new_bits + line - bytespp); + for(unsigned c = 0; c < width; c++) { + for(unsigned k = 0; k < bytespp; k++) { + *dst_data++ = src_data[k]; + } + src_data -= bytespp; + } + } + break; + + } + } + + FreeImage_Aligned_Free(new_bits); + + return TRUE; +} + + +/** +Flip the image vertically along the horizontal axis. +@param src Input image to be processed. +@return Returns TRUE if successful, FALSE otherwise. +*/ + +BOOL DLL_CALLCONV +FreeImage_FlipVertical(FIBITMAP *src) { + BYTE *From, *Mid; + + if (!src) return FALSE; + + // swap the buffer + + unsigned pitch = FreeImage_GetPitch(src); + unsigned height = FreeImage_GetHeight(src); + + // copy between aligned memories + Mid = (BYTE*)FreeImage_Aligned_Malloc(pitch * sizeof(BYTE), FIBITMAP_ALIGNMENT); + if (!Mid) return FALSE; + + From = FreeImage_GetBits(src); + + unsigned line_s = 0; + unsigned line_t = (height-1) * pitch; + + for(unsigned y = 0; y < height/2; y++) { + + memcpy(Mid, From + line_s, pitch); + memcpy(From + line_s, From + line_t, pitch); + memcpy(From + line_t, Mid, pitch); + + line_s += pitch; + line_t -= pitch; + + } + + FreeImage_Aligned_Free(Mid); + + return TRUE; +} + |