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// ==========================================================
// Bitmap conversion routines
//
// Design and implementation by
// - Floris van den Berg (flvdberg@wxs.nl)
// - Hervé Drolon (drolon@infonie.fr)
// - Jani Kajala (janik@remedy.fi)
//
// 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"
// ----------------------------------------------------------
// internal conversions X to 16 bits (565)
// ----------------------------------------------------------
void DLL_CALLCONV
FreeImage_ConvertLine1To16_565(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette) {
WORD *new_bits = (WORD *)target;
for (int cols = 0; cols < width_in_pixels; cols++) {
int index = (source[cols >> 3] & (0x80 >> (cols & 0x07))) != 0 ? 1 : 0;
new_bits[cols] = RGB565(palette[index].rgbBlue, palette[index].rgbGreen, palette[index].rgbRed);
}
}
void DLL_CALLCONV
FreeImage_ConvertLine4To16_565(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette) {
WORD *new_bits = (WORD *)target;
BOOL lonibble = FALSE;
int x = 0;
for (int cols = 0; cols < width_in_pixels; cols++) {
RGBQUAD *grab_palette;
if (lonibble) {
grab_palette = palette + LOWNIBBLE(source[x++]);
} else {
grab_palette = palette + (HINIBBLE(source[x]) >> 4);
}
new_bits[cols] = RGB565(grab_palette->rgbBlue, grab_palette->rgbGreen, grab_palette->rgbRed);
lonibble = !lonibble;
}
}
void DLL_CALLCONV
FreeImage_ConvertLine8To16_565(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette) {
WORD *new_bits = (WORD *)target;
for (int cols = 0; cols < width_in_pixels; cols++) {
RGBQUAD *grab_palette = palette + source[cols];
new_bits[cols] = RGB565(grab_palette->rgbBlue, grab_palette->rgbGreen, grab_palette->rgbRed);
}
}
void DLL_CALLCONV
FreeImage_ConvertLine16_555_To16_565(BYTE *target, BYTE *source, int width_in_pixels) {
WORD *src_bits = (WORD *)source;
WORD *new_bits = (WORD *)target;
for (int cols = 0; cols < width_in_pixels; cols++) {
new_bits[cols] = RGB565((((src_bits[cols] & FI16_555_BLUE_MASK) >> FI16_555_BLUE_SHIFT) * 0xFF) / 0x1F,
(((src_bits[cols] & FI16_555_GREEN_MASK) >> FI16_555_GREEN_SHIFT) * 0xFF) / 0x1F,
(((src_bits[cols] & FI16_555_RED_MASK) >> FI16_555_RED_SHIFT) * 0xFF) / 0x1F);
}
}
void DLL_CALLCONV
FreeImage_ConvertLine24To16_565(BYTE *target, BYTE *source, int width_in_pixels) {
WORD *new_bits = (WORD *)target;
for (int cols = 0; cols < width_in_pixels; cols++) {
new_bits[cols] = RGB565(source[FI_RGBA_BLUE], source[FI_RGBA_GREEN], source[FI_RGBA_RED]);
source += 3;
}
}
void DLL_CALLCONV
FreeImage_ConvertLine32To16_565(BYTE *target, BYTE *source, int width_in_pixels) {
WORD *new_bits = (WORD *)target;
for (int cols = 0; cols < width_in_pixels; cols++) {
new_bits[cols] = RGB565(source[FI_RGBA_BLUE], source[FI_RGBA_GREEN], source[FI_RGBA_RED]);
source += 4;
}
}
// ----------------------------------------------------------
// smart convert X to 16 bits (565)
// ----------------------------------------------------------
FIBITMAP * DLL_CALLCONV
FreeImage_ConvertTo16Bits565(FIBITMAP *dib) {
if(!FreeImage_HasPixels(dib) || (FreeImage_GetImageType(dib) != FIT_BITMAP)) return NULL;
const int width = FreeImage_GetWidth(dib);
const int height = FreeImage_GetHeight(dib);
const int bpp = FreeImage_GetBPP(dib);
if(bpp == 16) {
if ((FreeImage_GetRedMask(dib) == FI16_555_RED_MASK) && (FreeImage_GetGreenMask(dib) == FI16_555_GREEN_MASK) && (FreeImage_GetBlueMask(dib) == FI16_555_BLUE_MASK)) {
// RGB 555
FIBITMAP *new_dib = FreeImage_Allocate(width, height, 16, FI16_565_RED_MASK, FI16_565_GREEN_MASK, FI16_565_BLUE_MASK);
if(new_dib == NULL) {
return NULL;
}
for (int rows = 0; rows < height; rows++) {
FreeImage_ConvertLine16_555_To16_565(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
}
// copy metadata from src to dst
FreeImage_CloneMetadata(new_dib, dib);
return new_dib;
} else {
// RGB 565
return FreeImage_Clone(dib);
}
}
else {
// other bpp cases => convert to RGB 565
FIBITMAP *new_dib = FreeImage_Allocate(width, height, 16, FI16_565_RED_MASK, FI16_565_GREEN_MASK, FI16_565_BLUE_MASK);
if(new_dib == NULL) {
return NULL;
}
// copy metadata from src to dst
FreeImage_CloneMetadata(new_dib, dib);
switch (bpp) {
case 1 :
{
for (int rows = 0; rows < height; rows++) {
FreeImage_ConvertLine1To16_565(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
}
return new_dib;
}
case 4 :
{
for (int rows = 0; rows < height; rows++) {
FreeImage_ConvertLine4To16_565(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
}
return new_dib;
}
case 8 :
{
for (int rows = 0; rows < height; rows++) {
FreeImage_ConvertLine8To16_565(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
}
return new_dib;
}
case 24 :
{
for (int rows = 0; rows < height; rows++) {
FreeImage_ConvertLine24To16_565(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
}
return new_dib;
}
case 32 :
{
for (int rows = 0; rows < height; rows++) {
FreeImage_ConvertLine32To16_565(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
}
return new_dib;
}
default :
// unreachable code ...
FreeImage_Unload(new_dib);
break;
}
}
return NULL;
}
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