1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
// ==========================================================
// Bitmap conversion routines
//
// Design and implementation by
// - Hervй 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;
}
|
