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// ==========================================================
// Flipping routines
//
// Design and implementation by
// - Floris van den Berg (flvdberg@wxs.nl)
// - Herv 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 height = FreeImage_GetHeight(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 :
{
unsigned width = FreeImage_GetWidth(src);
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:
case 16:
case 24 :
case 32 :
case 48:
case 64:
case 96:
case 128:
{
int bytespp = FreeImage_GetLine(src) / FreeImage_GetWidth(src);
for(unsigned c = 0; c < line; c += bytespp) {
memcpy(bits + c, new_bits + line - c - bytespp, 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;
}
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