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// ==========================================================
// Bitmap conversion routines
//
// Design and implementation by
// - Floris van den Berg (flvdberg@wxs.nl)
// - Dale Larson (dlarson@norsesoft.com)
// - 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 24 bits
// ----------------------------------------------------------
void DLL_CALLCONV
FreeImage_ConvertLine1To24(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette) {
for (int cols = 0; cols < width_in_pixels; cols++) {
BYTE index = (source[cols >> 3] & (0x80 >> (cols & 0x07))) != 0 ? 1 : 0;
target[FI_RGBA_BLUE] = palette[index].rgbBlue;
target[FI_RGBA_GREEN] = palette[index].rgbGreen;
target[FI_RGBA_RED] = palette[index].rgbRed;
target += 3;
}
}
void DLL_CALLCONV
FreeImage_ConvertLine4To24(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette) {
BOOL low_nibble = FALSE;
int x = 0;
for (int cols = 0; cols < width_in_pixels; ++cols ) {
if (low_nibble) {
target[FI_RGBA_BLUE] = palette[LOWNIBBLE(source[x])].rgbBlue;
target[FI_RGBA_GREEN] = palette[LOWNIBBLE(source[x])].rgbGreen;
target[FI_RGBA_RED] = palette[LOWNIBBLE(source[x])].rgbRed;
x++;
} else {
target[FI_RGBA_BLUE] = palette[HINIBBLE(source[x]) >> 4].rgbBlue;
target[FI_RGBA_GREEN] = palette[HINIBBLE(source[x]) >> 4].rgbGreen;
target[FI_RGBA_RED] = palette[HINIBBLE(source[x]) >> 4].rgbRed;
}
low_nibble = !low_nibble;
target += 3;
}
}
void DLL_CALLCONV
FreeImage_ConvertLine8To24(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette) {
for (int cols = 0; cols < width_in_pixels; cols++) {
target[FI_RGBA_BLUE] = palette[source[cols]].rgbBlue;
target[FI_RGBA_GREEN] = palette[source[cols]].rgbGreen;
target[FI_RGBA_RED] = palette[source[cols]].rgbRed;
target += 3;
}
}
void DLL_CALLCONV
FreeImage_ConvertLine16To24_555(BYTE *target, BYTE *source, int width_in_pixels) {
WORD *bits = (WORD *)source;
for (int cols = 0; cols < width_in_pixels; cols++) {
target[FI_RGBA_RED] = (BYTE)((((bits[cols] & FI16_555_RED_MASK) >> FI16_555_RED_SHIFT) * 0xFF) / 0x1F);
target[FI_RGBA_GREEN] = (BYTE)((((bits[cols] & FI16_555_GREEN_MASK) >> FI16_555_GREEN_SHIFT) * 0xFF) / 0x1F);
target[FI_RGBA_BLUE] = (BYTE)((((bits[cols] & FI16_555_BLUE_MASK) >> FI16_555_BLUE_SHIFT) * 0xFF) / 0x1F);
target += 3;
}
}
void DLL_CALLCONV
FreeImage_ConvertLine16To24_565(BYTE *target, BYTE *source, int width_in_pixels) {
WORD *bits = (WORD *)source;
for (int cols = 0; cols < width_in_pixels; cols++) {
target[FI_RGBA_RED] = (BYTE)((((bits[cols] & FI16_565_RED_MASK) >> FI16_565_RED_SHIFT) * 0xFF) / 0x1F);
target[FI_RGBA_GREEN] = (BYTE)((((bits[cols] & FI16_565_GREEN_MASK) >> FI16_565_GREEN_SHIFT) * 0xFF) / 0x3F);
target[FI_RGBA_BLUE] = (BYTE)((((bits[cols] & FI16_565_BLUE_MASK) >> FI16_565_BLUE_SHIFT) * 0xFF) / 0x1F);
target += 3;
}
}
void DLL_CALLCONV
FreeImage_ConvertLine32To24(BYTE *target, BYTE *source, int width_in_pixels) {
for (int cols = 0; cols < width_in_pixels; cols++) {
target[FI_RGBA_BLUE] = source[FI_RGBA_BLUE];
target[FI_RGBA_GREEN] = source[FI_RGBA_GREEN];
target[FI_RGBA_RED] = source[FI_RGBA_RED];
target += 3;
source += 4;
}
}
// ----------------------------------------------------------
// smart convert X to 24 bits
// ----------------------------------------------------------
FIBITMAP * DLL_CALLCONV
FreeImage_ConvertTo24Bits(FIBITMAP *dib) {
if (!FreeImage_HasPixels(dib)) return NULL;
const unsigned bpp = FreeImage_GetBPP(dib);
const FREE_IMAGE_TYPE image_type = FreeImage_GetImageType(dib);
if ((image_type != FIT_BITMAP) && (image_type != FIT_RGB16)) {
return NULL;
}
if (bpp != 24) {
const int width = FreeImage_GetWidth(dib);
const int height = FreeImage_GetHeight(dib);
FIBITMAP *new_dib = FreeImage_Allocate(width, height, 24, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_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_ConvertLine1To24(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_ConvertLine4To24(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_ConvertLine8To24(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
}
return new_dib;
}
case 16 :
{
for (int rows = 0; rows < height; rows++) {
if ((FreeImage_GetRedMask(dib) == FI16_565_RED_MASK) && (FreeImage_GetGreenMask(dib) == FI16_565_GREEN_MASK) && (FreeImage_GetBlueMask(dib) == FI16_565_BLUE_MASK)) {
FreeImage_ConvertLine16To24_565(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
} else {
// includes case where all the masks are 0
FreeImage_ConvertLine16To24_555(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
}
}
return new_dib;
}
case 32 :
{
for (int rows = 0; rows < height; rows++) {
FreeImage_ConvertLine32To24(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
}
return new_dib;
}
case 48:
{
const unsigned src_pitch = FreeImage_GetPitch(dib);
const unsigned dst_pitch = FreeImage_GetPitch(new_dib);
const BYTE *src_bits = FreeImage_GetBits(dib);
BYTE *dst_bits = FreeImage_GetBits(new_dib);
for (int rows = 0; rows < height; rows++) {
const FIRGB16 *src_pixel = (FIRGB16*)src_bits;
RGBTRIPLE *dst_pixel = (RGBTRIPLE*)dst_bits;
for(int cols = 0; cols < width; cols++) {
dst_pixel[cols].rgbtRed = (BYTE)(src_pixel[cols].red >> 8);
dst_pixel[cols].rgbtGreen = (BYTE)(src_pixel[cols].green >> 8);
dst_pixel[cols].rgbtBlue = (BYTE)(src_pixel[cols].blue >> 8);
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
return new_dib;
}
}
}
return FreeImage_Clone(dib);
}
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