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/*
Plugin of Miranda IM for reading/writing PNG images.
Copyright (c) 2004-06 George Hazan (ghazan@postman.ru)
Portions of this code are gotten from the libpng codebase.
Copyright 2000, Willem van Schaik. For conditions of distribution and
use, see the copyright/license/disclaimer notice in png.h
Miranda IM: the free icq client for MS Windows
Copyright (C) 2000-2002 Richard Hughes, Roland Rabien & Tristan Van de Vreede
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "stdafx.h"
/*
* freeimage helper functions
*/
// Correct alpha from bitmaps loaded without it (it cames with 0 and should be 255)
// originally in loadavatars...
EXTERN_C DLL_API void DLL_CALLCONV FreeImage_CorrectBitmap32Alpha(HBITMAP hBitmap, BOOL force)
{
BITMAP bmp;
DWORD dwLen;
uint8_t *p;
int x, y;
BOOL fixIt;
GetObject(hBitmap, sizeof(bmp), &bmp);
if (bmp.bmBitsPixel != 32)
return;
dwLen = bmp.bmWidth * bmp.bmHeight * (bmp.bmBitsPixel / 8);
p = (uint8_t *)malloc(dwLen);
if (p == nullptr)
return;
memset(p, 0, dwLen);
GetBitmapBits(hBitmap, dwLen, p);
fixIt = TRUE;
for (y = 0; fixIt && y < bmp.bmHeight; ++y) {
uint8_t *px = p + bmp.bmWidth * 4 * y;
for (x = 0; fixIt && x < bmp.bmWidth; ++x)
{
if (px[3] != 0 && !force)
{
fixIt = FALSE;
}
else
{
px[3] = 255;
}
px += 4;
}
}
if (fixIt)
SetBitmapBits(hBitmap, dwLen, p);
free(p);
}
/*
* needed for per pixel transparent images. Such images should then be rendered by
* using AlphaBlend() with AC_SRC_ALPHA
* dwFlags will be set to AVS_PREMULTIPLIED
* return TRUE if the image has at least one pixel with transparency
*/
EXTERN_C DLL_API BOOL DLL_CALLCONV FreeImage_Premultiply(HBITMAP hBitmap)
{
BOOL transp = FALSE;
BITMAP bmp;
GetObject(hBitmap, sizeof(bmp), &bmp);
if (bmp.bmBitsPixel == 32) {
int width = bmp.bmWidth;
int height = bmp.bmHeight;
int dwLen = width * height * 4;
uint8_t *p = (uint8_t *)malloc(dwLen);
if (p != nullptr) {
GetBitmapBits(hBitmap, dwLen, p);
for (int y = 0; y < height; ++y) {
uint8_t *px = p + width * 4 * y;
for (int x = 0; x < width; ++x) {
uint8_t alpha = px[3];
if (alpha < 255) {
transp = TRUE;
px[0] = px[0] * alpha/255;
px[1] = px[1] * alpha/255;
px[2] = px[2] * alpha/255;
}
px += 4;
}
}
if (transp)
dwLen = SetBitmapBits(hBitmap, dwLen, p);
free(p);
}
}
return transp;
}
EXTERN_C DLL_API HBITMAP DLL_CALLCONV FreeImage_CreateHBITMAPFromDIB(FIBITMAP *in)
{
FIBITMAP *dib = nullptr;
int bpp = FreeImage_GetBPP(in);
if (bpp == 48)
dib = FreeImage_ConvertTo24Bits(in);
else if (FreeImage_GetBPP(in) > 32)
dib = FreeImage_ConvertTo32Bits(in);
else
dib = in;
uint8_t *ptPixels;
BITMAPINFO *info = FreeImage_GetInfo(dib);
HBITMAP hBmp = CreateDIBSection(nullptr, info, DIB_RGB_COLORS, (void **)&ptPixels, nullptr, 0);
if (ptPixels != nullptr)
memmove(ptPixels, FreeImage_GetBits(dib), FreeImage_GetPitch(dib) * FreeImage_GetHeight(dib));
if (dib != in)
FreeImage_Unload(dib);
return hBmp;
}
EXTERN_C DLL_API FIBITMAP* DLL_CALLCONV FreeImage_CreateDIBFromHBITMAP(HBITMAP hBmp)
{
if (!hBmp)
return nullptr;
BITMAP bm;
GetObject(hBmp, sizeof(BITMAP), (LPSTR) &bm);
FIBITMAP *dib = FreeImage_Allocate(bm.bmWidth, bm.bmHeight, bm.bmBitsPixel,0,0,0);
// The GetDIBits function clears the biClrUsed and biClrImportant BITMAPINFO members (dont't know why)
// So we save these infos below. This is needed for palettized images only.
int nColors = FreeImage_GetColorsUsed(dib);
HDC dc = GetDC(nullptr);
GetDIBits(dc, hBmp, 0, FreeImage_GetHeight(dib), FreeImage_GetBits(dib), FreeImage_GetInfo(dib), DIB_RGB_COLORS);
ReleaseDC(nullptr, dc);
// restore BITMAPINFO members
FreeImage_GetInfoHeader(dib)->biClrUsed = nColors;
FreeImage_GetInfoHeader(dib)->biClrImportant = nColors;
return dib;
}
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