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// ==========================================================
// Pixel access functions
//
// Design and implementation by
// - Floris van den Berg (flvdberg@wxs.nl)
// - Herv Drolon (drolon@infonie.fr)
// - Ryan Rubley (ryan@lostreality.org)
// - Riley McNiff (rmcniff@marexgroup.com)
//
// 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"
// ----------------------------------------------------------
BYTE * DLL_CALLCONV
FreeImage_GetBits(FIBITMAP *dib) {
if(!dib) return NULL;
// returns the pixels aligned on a FIBITMAP_ALIGNMENT bytes alignment boundary
size_t lp = (size_t)FreeImage_GetInfoHeader(dib);
lp += sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * FreeImage_GetColorsUsed(dib);
lp += (lp % FIBITMAP_ALIGNMENT ? FIBITMAP_ALIGNMENT - lp % FIBITMAP_ALIGNMENT : 0);
return (BYTE *)lp;
}
BYTE * DLL_CALLCONV
FreeImage_GetScanLine(FIBITMAP *dib, int scanline) {
return (dib) ? CalculateScanLine(FreeImage_GetBits(dib), FreeImage_GetPitch(dib), scanline) : NULL;
}
BOOL DLL_CALLCONV
FreeImage_GetPixelIndex(FIBITMAP *dib, unsigned x, unsigned y, BYTE *value) {
BYTE shift;
if(!dib || (FreeImage_GetImageType(dib) != FIT_BITMAP))
return FALSE;
if((x < FreeImage_GetWidth(dib)) && (y < FreeImage_GetHeight(dib))) {
BYTE *bits = FreeImage_GetScanLine(dib, y);
switch(FreeImage_GetBPP(dib)) {
case 1:
*value = (bits[x >> 3] & (0x80 >> (x & 0x07))) != 0;
break;
case 4:
shift = (BYTE)((1 - x % 2) << 2);
*value = (bits[x >> 1] & (0x0F << shift)) >> shift;
break;
case 8:
*value = bits[x];
break;
default:
return FALSE;
}
return TRUE;
}
return FALSE;
}
BOOL DLL_CALLCONV
FreeImage_GetPixelColor(FIBITMAP *dib, unsigned x, unsigned y, RGBQUAD *value) {
if(!dib || (FreeImage_GetImageType(dib) != FIT_BITMAP))
return FALSE;
if((x < FreeImage_GetWidth(dib)) && (y < FreeImage_GetHeight(dib))) {
BYTE *bits = FreeImage_GetScanLine(dib, y);
switch(FreeImage_GetBPP(dib)) {
case 16:
{
bits += 2*x;
WORD *pixel = (WORD *)bits;
if((FreeImage_GetRedMask(dib) == FI16_565_RED_MASK) && (FreeImage_GetGreenMask(dib) == FI16_565_GREEN_MASK) && (FreeImage_GetBlueMask(dib) == FI16_565_BLUE_MASK)) {
value->rgbBlue = (BYTE)((((*pixel & FI16_565_BLUE_MASK) >> FI16_565_BLUE_SHIFT) * 0xFF) / 0x1F);
value->rgbGreen = (BYTE)((((*pixel & FI16_565_GREEN_MASK) >> FI16_565_GREEN_SHIFT) * 0xFF) / 0x3F);
value->rgbRed = (BYTE)((((*pixel & FI16_565_RED_MASK) >> FI16_565_RED_SHIFT) * 0xFF) / 0x1F);
value->rgbReserved = 0;
} else {
value->rgbBlue = (BYTE)((((*pixel & FI16_555_BLUE_MASK) >> FI16_555_BLUE_SHIFT) * 0xFF) / 0x1F);
value->rgbGreen = (BYTE)((((*pixel & FI16_555_GREEN_MASK) >> FI16_555_GREEN_SHIFT) * 0xFF) / 0x1F);
value->rgbRed = (BYTE)((((*pixel & FI16_555_RED_MASK) >> FI16_555_RED_SHIFT) * 0xFF) / 0x1F);
value->rgbReserved = 0;
}
break;
}
case 24:
bits += 3*x;
value->rgbBlue = bits[FI_RGBA_BLUE]; // B
value->rgbGreen = bits[FI_RGBA_GREEN]; // G
value->rgbRed = bits[FI_RGBA_RED]; // R
value->rgbReserved = 0;
break;
case 32:
bits += 4*x;
value->rgbBlue = bits[FI_RGBA_BLUE]; // B
value->rgbGreen = bits[FI_RGBA_GREEN]; // G
value->rgbRed = bits[FI_RGBA_RED]; // R
value->rgbReserved = bits[FI_RGBA_ALPHA]; // A
break;
default:
return FALSE;
}
return TRUE;
}
return FALSE;
}
BOOL DLL_CALLCONV
FreeImage_SetPixelIndex(FIBITMAP *dib, unsigned x, unsigned y, BYTE *value) {
BYTE shift;
if(!dib || (FreeImage_GetImageType(dib) != FIT_BITMAP))
return FALSE;
if((x < FreeImage_GetWidth(dib)) && (y < FreeImage_GetHeight(dib))) {
BYTE *bits = FreeImage_GetScanLine(dib, y);
switch(FreeImage_GetBPP(dib)) {
case 1:
*value ? bits[x >> 3] |= (0x80 >> (x & 0x7)) : bits[x >> 3] &= (0xFF7F >> (x & 0x7));
break;
case 4:
shift = (BYTE)((1 - x % 2) << 2);
bits[x >> 1] &= ~(0x0F << shift);
bits[x >> 1] |= ((*value & 0x0F) << shift);
break;
case 8:
bits[x] = *value;
break;
default:
return FALSE;
}
return TRUE;
}
return FALSE;
}
BOOL DLL_CALLCONV
FreeImage_SetPixelColor(FIBITMAP *dib, unsigned x, unsigned y, RGBQUAD *value) {
if(!dib || (FreeImage_GetImageType(dib) != FIT_BITMAP))
return FALSE;
if((x < FreeImage_GetWidth(dib)) && (y < FreeImage_GetHeight(dib))) {
BYTE *bits = FreeImage_GetScanLine(dib, y);
switch(FreeImage_GetBPP(dib)) {
case 16:
{
bits += 2*x;
WORD *pixel = (WORD *)bits;
if((FreeImage_GetRedMask(dib) == FI16_565_RED_MASK) && (FreeImage_GetGreenMask(dib) == FI16_565_GREEN_MASK) && (FreeImage_GetBlueMask(dib) == FI16_565_BLUE_MASK)) {
*pixel = ((value->rgbBlue >> 3) << FI16_565_BLUE_SHIFT) |
((value->rgbGreen >> 2) << FI16_565_GREEN_SHIFT) |
((value->rgbRed >> 3) << FI16_565_RED_SHIFT);
} else {
*pixel = ((value->rgbBlue >> 3) << FI16_555_BLUE_SHIFT) |
((value->rgbGreen >> 3) << FI16_555_GREEN_SHIFT) |
((value->rgbRed >> 3) << FI16_555_RED_SHIFT);
}
break;
}
case 24:
bits += 3*x;
bits[FI_RGBA_BLUE] = value->rgbBlue; // B
bits[FI_RGBA_GREEN] = value->rgbGreen; // G
bits[FI_RGBA_RED] = value->rgbRed; // R
break;
case 32:
bits += 4*x;
bits[FI_RGBA_BLUE] = value->rgbBlue; // B
bits[FI_RGBA_GREEN] = value->rgbGreen; // G
bits[FI_RGBA_RED] = value->rgbRed; // R
bits[FI_RGBA_ALPHA] = value->rgbReserved; // A
break;
default:
return FALSE;
}
return TRUE;
}
return FALSE;
}
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