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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)
// - Detlev Vendt (detlev.vendt@brillit.de)
//
// 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 32 bits
// ----------------------------------------------------------
void DLL_CALLCONV
FreeImage_ConvertLine1To32(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette) {
for (int cols = 0; cols < width_in_pixels; cols++) {
int 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[FI_RGBA_ALPHA] = 0xFF;
target += 4;
}
}
void DLL_CALLCONV
FreeImage_ConvertLine4To32(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[FI_RGBA_ALPHA] = 0xFF;
target += 4;
}
}
void DLL_CALLCONV
FreeImage_ConvertLine8To32(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[FI_RGBA_ALPHA] = 0xFF;
target += 4;
}
}
void DLL_CALLCONV
FreeImage_ConvertLine16To32_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[FI_RGBA_ALPHA] = 0xFF;
target += 4;
}
}
void DLL_CALLCONV
FreeImage_ConvertLine16To32_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[FI_RGBA_ALPHA] = 0xFF;
target += 4;
}
}
/*
void DLL_CALLCONV
FreeImage_ConvertLine24To32(BYTE *target, BYTE *source, int width_in_pixels) {
for (int cols = 0; cols < width_in_pixels; cols++) {
*(DWORD *)target = (*(DWORD *) source & FI_RGBA_RGB_MASK) | FI_RGBA_ALPHA_MASK;
target += 4;
source += 3;
}
}
*/
/**
This unoptimized version of the conversion function avoid an undetermined bug with VC++ SP6.
The bug occurs in release mode only, when the image height is equal to 537
(try e.g. a size of 432x537 to reproduce the bug with the optimized function).
*/
void DLL_CALLCONV
FreeImage_ConvertLine24To32(BYTE *target, BYTE *source, int width_in_pixels) {
for (int cols = 0; cols < width_in_pixels; cols++) {
target[FI_RGBA_RED] = source[FI_RGBA_RED];
target[FI_RGBA_GREEN] = source[FI_RGBA_GREEN];
target[FI_RGBA_BLUE] = source[FI_RGBA_BLUE];
target[FI_RGBA_ALPHA] = 0xFF;
target += 4;
source += 3;
}
}
// ----------------------------------------------------------
static void DLL_CALLCONV
MapTransparentTableToAlpha1(RGBQUAD *target, BYTE *source, BYTE *table, int transparent_pixels, int width_in_pixels) {
for (int cols = 0 ; cols < width_in_pixels ; cols++) {
int index = (source[cols>>3] & (0x80 >> (cols & 0x07))) != 0 ? 1 : 0;
target[cols].rgbReserved = (index < transparent_pixels) ? table[index] : 255;
}
}
static void DLL_CALLCONV
MapTransparentTableToAlpha4(RGBQUAD *target, BYTE *source, BYTE *table, int transparent_pixels, int width_in_pixels) {
BOOL low_nibble = FALSE;
int x = 0;
for (int cols = 0 ; cols < width_in_pixels ; ++cols) {
int index;
if (low_nibble) {
index = LOWNIBBLE(source[x]);
x++;
} else {
index = HINIBBLE(source[x]) >> 4;
}
target[cols].rgbReserved = (index < transparent_pixels) ? table[index] : 255;
low_nibble = !low_nibble;
}
}
static void DLL_CALLCONV
MapTransparentTableToAlpha8(RGBQUAD *target, BYTE *source, BYTE *table, int transparent_pixels, int width_in_pixels) {
for (int cols = 0; cols < width_in_pixels; cols++) {
target[cols].rgbReserved = (source[cols] < transparent_pixels) ? table[source[cols]] : 255;
}
}
// ----------------------------------------------------------
FIBITMAP * DLL_CALLCONV
FreeImage_ConvertTo32Bits(FIBITMAP *dib) {
if(!dib) return NULL;
const int bpp = FreeImage_GetBPP(dib);
const FREE_IMAGE_TYPE image_type = FreeImage_GetImageType(dib);
if((image_type != FIT_BITMAP) && (image_type != FIT_RGB16) && (image_type != FIT_RGBA16)) {
return NULL;
}
const int width = FreeImage_GetWidth(dib);
const int height = FreeImage_GetHeight(dib);
if(image_type == FIT_BITMAP) {
if(bpp == 32) {
return FreeImage_Clone(dib);
}
FIBITMAP *new_dib = FreeImage_Allocate(width, height, 32, 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_ConvertLine1To32(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
if (FreeImage_IsTransparent(dib)) {
MapTransparentTableToAlpha1((RGBQUAD *)FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), FreeImage_GetTransparencyTable(dib), FreeImage_GetTransparencyCount(dib), width);
}
}
return new_dib;
}
case 4:
{
for (int rows = 0; rows < height; rows++) {
FreeImage_ConvertLine4To32(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
if (FreeImage_IsTransparent(dib)) {
MapTransparentTableToAlpha4((RGBQUAD *)FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), FreeImage_GetTransparencyTable(dib), FreeImage_GetTransparencyCount(dib), width);
}
}
return new_dib;
}
case 8:
{
for (int rows = 0; rows < height; rows++) {
FreeImage_ConvertLine8To32(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
if (FreeImage_IsTransparent(dib)) {
MapTransparentTableToAlpha8((RGBQUAD *)FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), FreeImage_GetTransparencyTable(dib), FreeImage_GetTransparencyCount(dib), width);
}
}
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_ConvertLine16To32_565(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
} else {
// includes case where all the masks are 0
FreeImage_ConvertLine16To32_555(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
}
}
return new_dib;
}
case 24:
{
for (int rows = 0; rows < height; rows++) {
FreeImage_ConvertLine24To32(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width);
}
return new_dib;
}
}
} else if(image_type == FIT_RGB16) {
FIBITMAP *new_dib = FreeImage_Allocate(width, height, 32, 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);
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;
RGBQUAD *dst_pixel = (RGBQUAD*)dst_bits;
for(int cols = 0; cols < width; cols++) {
dst_pixel[cols].rgbRed = (BYTE)(src_pixel[cols].red >> 8);
dst_pixel[cols].rgbGreen = (BYTE)(src_pixel[cols].green >> 8);
dst_pixel[cols].rgbBlue = (BYTE)(src_pixel[cols].blue >> 8);
dst_pixel[cols].rgbReserved = (BYTE)0xFF;
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
return new_dib;
} else if(image_type == FIT_RGBA16) {
FIBITMAP *new_dib = FreeImage_Allocate(width, height, 32, 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);
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 FIRGBA16 *src_pixel = (FIRGBA16*)src_bits;
RGBQUAD *dst_pixel = (RGBQUAD*)dst_bits;
for(int cols = 0; cols < width; cols++) {
dst_pixel[cols].rgbRed = (BYTE)(src_pixel[cols].red >> 8);
dst_pixel[cols].rgbGreen = (BYTE)(src_pixel[cols].green >> 8);
dst_pixel[cols].rgbBlue = (BYTE)(src_pixel[cols].blue >> 8);
dst_pixel[cols].rgbReserved = (BYTE)(src_pixel[cols].alpha >> 8);
}
src_bits += src_pitch;
dst_bits += dst_pitch;
}
return new_dib;
}
return NULL;
}
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