/src/FreeImage/Source/FreeImage/Conversion16_555.cpp

  1// ==========================================================
  2// Bitmap conversion routines
  3//
  4// Design and implementation by
  5// - Floris van den Berg (flvdberg@wxs.nl)
  6// - Hervé Drolon (drolon@infonie.fr)
  7// - Jani Kajala (janik@remedy.fi)
  8//
  9// This file is part of FreeImage 3
 10//
 11// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
 12// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
 13// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
 14// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
 15// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
 16// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
 17// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
 18// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
 19// THIS DISCLAIMER.
 20//
 21// Use at your own risk!
 22// ==========================================================
 23
 24#include "FreeImage.h"
 25#include "Utilities.h"
 26
 27// ----------------------------------------------------------
 28
 29#define RGB555(b, g, r) ((((b) >> 3) << FI16_555_BLUE_SHIFT) | (((g) >> 3) << FI16_555_GREEN_SHIFT) | (((r) >> 3) << FI16_555_RED_SHIFT))
 30
 31// ----------------------------------------------------------
 32//  internal conversions X to 16 bits (555)
 33// ----------------------------------------------------------
 34
 35void DLL_CALLCONV
 36FreeImage_ConvertLine1To16_555(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette) {
 37	WORD *new_bits = (WORD *)target;
 38
 39	for (int cols = 0; cols < width_in_pixels; cols++) {
 40		int index = (source[cols >> 3] & (0x80 >> (cols & 0x07))) != 0 ? 1 : 0;
 41
 42		new_bits[cols] = RGB555(palette[index].rgbBlue, palette[index].rgbGreen, palette[index].rgbRed);
 43	}
 44}
 45
 46void DLL_CALLCONV
 47FreeImage_ConvertLine4To16_555(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette) {
 48	WORD *new_bits = (WORD *)target;
 49	BOOL lonibble = FALSE;
 50	int x = 0;
 51
 52	for (int cols = 0; cols < width_in_pixels; cols++) {
 53		RGBQUAD *grab_palette;
 54
 55		if (lonibble) {
 56			grab_palette = palette + LOWNIBBLE(source[x++]);
 57		} else {
 58			grab_palette = palette + (HINIBBLE(source[x]) >> 4);								
 59		}
 60
 61		new_bits[cols] = RGB555(grab_palette->rgbBlue, grab_palette->rgbGreen, grab_palette->rgbRed);
 62
 63		lonibble = !lonibble;
 64	}
 65}
 66
 67void DLL_CALLCONV
 68FreeImage_ConvertLine8To16_555(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette) {
 69	WORD *new_bits = (WORD *)target;
 70
 71	for (int cols = 0; cols < width_in_pixels; cols++) {
 72		RGBQUAD *grab_palette = palette + source[cols];
 73
 74		new_bits[cols] = RGB555(grab_palette->rgbBlue, grab_palette->rgbGreen, grab_palette->rgbRed);
 75	}
 76}
 77
 78void DLL_CALLCONV
 79FreeImage_ConvertLine16_565_To16_555(BYTE *target, BYTE *source, int width_in_pixels) {
 80	WORD *src_bits = (WORD *)source;
 81	WORD *new_bits = (WORD *)target;
 82
 83	for (int cols = 0; cols < width_in_pixels; cols++) {
 84		new_bits[cols] = RGB555((((src_bits[cols] & FI16_565_BLUE_MASK) >> FI16_565_BLUE_SHIFT) * 0xFF) / 0x1F,
 85			                    (((src_bits[cols] & FI16_565_GREEN_MASK) >> FI16_565_GREEN_SHIFT) * 0xFF) / 0x3F,
 86								(((src_bits[cols] & FI16_565_RED_MASK) >> FI16_565_RED_SHIFT) * 0xFF) / 0x1F);
 87	}
 88}
 89
 90void DLL_CALLCONV
 91FreeImage_ConvertLine24To16_555(BYTE *target, BYTE *source, int width_in_pixels) {
 92	WORD *new_bits = (WORD *)target;
 93
 94	for (int cols = 0; cols < width_in_pixels; cols++) {
 95		new_bits[cols] = RGB555(source[FI_RGBA_BLUE], source[FI_RGBA_GREEN], source[FI_RGBA_RED]);
 96
 97		source += 3;
 98	}
 99}
100
101void DLL_CALLCONV
102FreeImage_ConvertLine32To16_555(BYTE *target, BYTE *source, int width_in_pixels) {
103	WORD *new_bits = (WORD *)target;
104
105	for (int cols = 0; cols < width_in_pixels; cols++) {
106		new_bits[cols] = RGB555(source[FI_RGBA_BLUE], source[FI_RGBA_GREEN], source[FI_RGBA_RED]);
107
108		source += 4;
109	}
110}
111
112// ----------------------------------------------------------
113//   smart convert X to 16 bits
114// ----------------------------------------------------------
115
116FIBITMAP * DLL_CALLCONV
117FreeImage_ConvertTo16Bits555(FIBITMAP *dib) {
118	if(!FreeImage_HasPixels(dib) || (FreeImage_GetImageType(dib) != FIT_BITMAP)) return NULL;
119
120	const int width = FreeImage_GetWidth(dib);
121	const int height = FreeImage_GetHeight(dib);
122	const int bpp = FreeImage_GetBPP(dib);
123
124	if(bpp == 16) {
125		if ((FreeImage_GetRedMask(dib) == FI16_565_RED_MASK) && (FreeImage_GetGreenMask(dib) == FI16_565_GREEN_MASK) && (FreeImage_GetBlueMask(dib) == FI16_565_BLUE_MASK)) {
126			// RGB 565
127			FIBITMAP *new_dib = FreeImage_Allocate(width, height, 16, FI16_555_RED_MASK, FI16_555_GREEN_MASK, FI16_555_BLUE_MASK);
128			if(new_dib == NULL) {
129				return NULL;
130			}
131			for (int rows = 0; rows < height; rows++) {
132				FreeImage_ConvertLine16_565_To16_555(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
133			}
134
135			// copy metadata from src to dst
136			FreeImage_CloneMetadata(new_dib, dib);
137
138			return new_dib;
139		} else {
140			// RGB 555
141			return FreeImage_Clone(dib);
142		}
143	}
144	else {
145		// other bpp cases => convert to RGB 555
146		FIBITMAP *new_dib = FreeImage_Allocate(width, height, 16, FI16_555_RED_MASK, FI16_555_GREEN_MASK, FI16_555_BLUE_MASK);
147		if(new_dib == NULL) {
148			return NULL;
149		}
150
151		// copy metadata from src to dst
152		FreeImage_CloneMetadata(new_dib, dib);
153
154		switch (bpp) {
155			case 1 :
156			{
157				for (int rows = 0; rows < height; rows++) {
158					FreeImage_ConvertLine1To16_555(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
159				}
160
161				return new_dib;
162			}
163
164			case 4 :
165			{
166				for (int rows = 0; rows < height; rows++) {
167					FreeImage_ConvertLine4To16_555(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
168				}
169
170				return new_dib;
171			}
172
173			case 8 :
174			{
175				for (int rows = 0; rows < height; rows++) {
176					FreeImage_ConvertLine8To16_555(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
177				}
178
179				return new_dib;
180			}
181
182			case 24 :
183			{
184				for (int rows = 0; rows < height; rows++) {
185					FreeImage_ConvertLine24To16_555(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
186				}
187
188				return new_dib;
189			}
190
191			case 32 :
192			{
193				for (int rows = 0; rows < height; rows++) {
194					FreeImage_ConvertLine32To16_555(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
195				}
196
197				return new_dib;
198			}
199
200			default :
201				// unreachable code ...
202				FreeImage_Unload(new_dib);
203				break;
204
205		}
206	}
207
208	return NULL;
209}