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/*
* tkWinIco.c --
*
* This file contains functions for icon-manipulation routines
* in Windows.
*
* Copyright © 1995-1996 Microsoft Corp.
* Copyright © 1998 Brueckner & Jarosch Ing.GmbH, Erfurt, Germany
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tkWinIco.h"
/*
*----------------------------------------------------------------------
*
* DIBNumColors --
*
* Calculates the number of entries in the color table, given by LPSTR
* lpbi - pointer to the CF_DIB memory block. Used by titlebar icon code.
*
* Results:
* WORD - Number of entries in the color table.
*
*----------------------------------------------------------------------
*/
static WORD
DIBNumColors(
LPSTR lpbi)
{
WORD wBitCount;
DWORD dwClrUsed;
dwClrUsed = ((LPBITMAPINFOHEADER) lpbi)->biClrUsed;
if (dwClrUsed) {
return (WORD) dwClrUsed;
}
wBitCount = ((LPBITMAPINFOHEADER) lpbi)->biBitCount;
switch (wBitCount) {
case 1:
return 2;
case 4:
return 16;
case 8:
return 256;
default:
return 0;
}
}
/*
*----------------------------------------------------------------------
*
* PaletteSize --
*
* Calculates the number of bytes in the color table, as given by LPSTR
* lpbi - pointer to the CF_DIB memory block. Used by titlebar icon code.
*
* Results:
* Number of bytes in the color table
*
*----------------------------------------------------------------------
*/
static WORD
PaletteSize(
LPSTR lpbi)
{
return (WORD) (DIBNumColors(lpbi) * sizeof(RGBQUAD));
}
/*
*----------------------------------------------------------------------
*
* FindDIBits --
*
* Locate the image bits in a CF_DIB format DIB, as given by LPSTR lpbi -
* pointer to the CF_DIB memory block. Used by titlebar icon code.
*
* Results:
* pointer to the image bits
*
* Side effects: None
*
*
*----------------------------------------------------------------------
*/
LPSTR
FindDIBBits(
LPSTR lpbi)
{
return lpbi + *((LPDWORD) lpbi) + PaletteSize(lpbi);
}
/*
*----------------------------------------------------------------------
*
* BytesPerLine --
*
* Calculates the number of bytes in one scan line, as given by
* LPBITMAPINFOHEADER lpBMIH - pointer to the BITMAPINFOHEADER that
* begins the CF_DIB block. Used by titlebar icon code.
*
* Results:
* number of bytes in one scan line (DWORD aligned)
*
*----------------------------------------------------------------------
*/
DWORD
BytesPerLine(
LPBITMAPINFOHEADER lpBMIH)
{
return WIDTHBYTES(lpBMIH->biWidth * lpBMIH->biPlanes * lpBMIH->biBitCount);
}
/*
*----------------------------------------------------------------------
*
* CreateIcoFromPhoto --
*
* Create ico pointer from Tk photo block.
*
* Results:
* Icon image is created from a valid Tk photo image.
*
* Side effects:
* Icon is created.
*
*----------------------------------------------------------------------
*/
HICON
CreateIcoFromPhoto(
int width, /* Width of image. */
int height, /* Height of image. */
Tk_PhotoImageBlock block) /* Image block to convert. */
{
int idx, bufferSize;
union {unsigned char *ptr; void *voidPtr;} bgraPixel;
union {unsigned char *ptr; void *voidPtr;} bgraMask;
HICON hIcon;
BITMAPINFO bmInfo;
ICONINFO iconInfo;
/*
* Don't use CreateIcon to create the icon, as it requires color
* bitmap data in device-dependent format. Instead we use
* CreateIconIndirect which takes device-independent bitmaps and
* converts them as required. Initialise icon info structure.
*/
memset(&iconInfo, 0, sizeof(iconInfo));
iconInfo.fIcon = TRUE;
/*
* Create device-independent color bitmap.
*/
memset(&bmInfo, 0, sizeof bmInfo);
bmInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmInfo.bmiHeader.biWidth = width;
bmInfo.bmiHeader.biHeight = -height;
bmInfo.bmiHeader.biPlanes = 1;
bmInfo.bmiHeader.biBitCount = 32;
bmInfo.bmiHeader.biCompression = BI_RGB;
iconInfo.hbmColor = CreateDIBSection(NULL, &bmInfo, DIB_RGB_COLORS,
&bgraPixel.voidPtr, NULL, 0);
if (!iconInfo.hbmColor) {
return NULL;
}
/*
* Convert the photo image data into BGRA format (RGBQUAD).
*/
bufferSize = height * width * 4;
for (idx = 0 ; idx < bufferSize ; idx += 4) {
bgraPixel.ptr[idx] = block.pixelPtr[idx+2];
bgraPixel.ptr[idx+1] = block.pixelPtr[idx+1];
bgraPixel.ptr[idx+2] = block.pixelPtr[idx+0];
bgraPixel.ptr[idx+3] = block.pixelPtr[idx+3];
}
/*
* Create a dummy mask bitmap. The contents of this don't appear to
* matter, as CreateIconIndirect will setup the icon mask based on the
* alpha channel in our color bitmap.
*/
bmInfo.bmiHeader.biBitCount = 1;
iconInfo.hbmMask = CreateDIBSection(NULL, &bmInfo, DIB_RGB_COLORS,
&bgraMask.voidPtr, NULL, 0);
if (!iconInfo.hbmMask) {
DeleteObject(iconInfo.hbmColor);
return NULL;
}
memset(bgraMask.ptr, 0, width*height/8);
/*
* Create an icon from the bitmaps.
*/
hIcon = CreateIconIndirect(&iconInfo);
DeleteObject(iconInfo.hbmColor);
DeleteObject(iconInfo.hbmMask);
if (hIcon == NULL) {
return NULL;
}
return hIcon;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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