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comctl32: Add a couple of DIB helper functions for imagelists.

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This commit is contained in:
Alexandre Julliard 2011-11-15 22:10:45 +01:00
parent e7bbb4ef1e
commit 4c785235d0
1 changed files with 64 additions and 55 deletions
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119
dlls/comctl32/imagelist.c
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@ -114,6 +114,17 @@ static inline void imagelist_get_bitmap_size( HIMAGELIST himl, UINT count, SIZE
sz->cy = imagelist_height( count ) * himl->cy;
}
static inline int get_dib_stride( int width, int bpp )
{
return ((width * bpp + 31) >> 3) & ~3;
}
static inline int get_dib_image_size( const BITMAPINFO *info )
{
return get_dib_stride( info->bmiHeader.biWidth, info->bmiHeader.biBitCount )
* abs( info->bmiHeader.biHeight );
}
/*
* imagelist_copy_images()
*
@ -139,6 +150,56 @@ static inline void imagelist_copy_images( HIMAGELIST himl, HDC hdcSrc, HDC hdcDe
}
}
static void add_dib_bits( HIMAGELIST himl, int pos, int count, int width, int height,
BITMAPINFO *info, BITMAPINFO *mask_info, DWORD *bits, BYTE *mask_bits )
{
int i, j, n;
POINT pt;
int stride = info->bmiHeader.biWidth;
int mask_stride = (info->bmiHeader.biWidth + 31) / 32 * 4;
for (n = 0; n < count; n++)
{
int has_alpha = 0;
imagelist_point_from_index( himl, pos + n, &pt );
/* check if bitmap has an alpha channel */
for (i = 0; i < height && !has_alpha; i++)
for (j = n * width; j < (n + 1) * width; j++)
if ((has_alpha = ((bits[i * stride + j] & 0xff000000) != 0))) break;
if (!has_alpha) /* generate alpha channel from the mask */
{
for (i = 0; i < height; i++)
for (j = n * width; j < (n + 1) * width; j++)
if (!mask_info || !((mask_bits[i * mask_stride + j / 8] << (j % 8)) & 0x80))
bits[i * stride + j] |= 0xff000000;
else
bits[i * stride + j] = 0;
}
else
{
himl->has_alpha[pos + n] = 1;
if (mask_info && himl->hbmMask) /* generate the mask from the alpha channel */
{
for (i = 0; i < height; i++)
for (j = n * width; j < (n + 1) * width; j++)
if ((bits[i * stride + j] >> 24) > 25) /* more than 10% alpha */
mask_bits[i * mask_stride + j / 8] &= ~(0x80 >> (j % 8));
else
mask_bits[i * mask_stride + j / 8] |= 0x80 >> (j % 8);
}
}
StretchDIBits( himl->hdcImage, pt.x, pt.y, himl->cx, himl->cy,
n * width, 0, width, height, bits, info, DIB_RGB_COLORS, SRCCOPY );
if (mask_info)
StretchDIBits( himl->hdcMask, pt.x, pt.y, himl->cx, himl->cy,
n * width, 0, width, height, mask_bits, mask_info, DIB_RGB_COLORS, SRCCOPY );
}
}
/* add images with an alpha channel when the image list is 32 bpp */
static BOOL add_with_alpha( HIMAGELIST himl, HDC hdc, int pos, int count,
int width, int height, HBITMAP hbmImage, HBITMAP hbmMask )
@ -148,8 +209,6 @@ static BOOL add_with_alpha( HIMAGELIST himl, HDC hdc, int pos, int count,
BITMAPINFO *info, *mask_info = NULL;
DWORD *bits = NULL;
BYTE *mask_bits = NULL;
int i, j, n;
POINT pt;
DWORD mask_width;
if (!GetObjectW( hbmImage, sizeof(bm), &bm )) return FALSE;
@ -188,46 +247,7 @@ static BOOL add_with_alpha( HIMAGELIST himl, HDC hdc, int pos, int count,
if (!GetDIBits( hdc, hbmMask, 0, height, mask_bits, mask_info, DIB_RGB_COLORS )) goto done;
}
for (n = 0; n < count; n++)
{
int has_alpha = 0;
imagelist_point_from_index( himl, pos + n, &pt );
/* check if bitmap has an alpha channel */
for (i = 0; i < height && !has_alpha; i++)
for (j = n * width; j < (n + 1) * width; j++)
if ((has_alpha = ((bits[i * bm.bmWidth + j] & 0xff000000) != 0))) break;
if (!has_alpha) /* generate alpha channel from the mask */
{
for (i = 0; i < height; i++)
for (j = n * width; j < (n + 1) * width; j++)
if (!mask_bits || !((mask_bits[i * mask_width + j / 8] << (j % 8)) & 0x80))
bits[i * bm.bmWidth + j] |= 0xff000000;
else
bits[i * bm.bmWidth + j] = 0;
}
else
{
himl->has_alpha[pos + n] = 1;
if (mask_info && himl->hbmMask) /* generate the mask from the alpha channel */
{
for (i = 0; i < height; i++)
for (j = n * width; j < (n + 1) * width; j++)
if ((bits[i * bm.bmWidth + j] >> 24) > 25) /* more than 10% alpha */
mask_bits[i * mask_width + j / 8] &= ~(0x80 >> (j % 8));
else
mask_bits[i * mask_width + j / 8] |= 0x80 >> (j % 8);
}
}
StretchDIBits( himl->hdcImage, pt.x, pt.y, himl->cx, himl->cy,
n * width, 0, width, height, bits, info, DIB_RGB_COLORS, SRCCOPY );
if (mask_info)
StretchDIBits( himl->hdcMask, pt.x, pt.y, himl->cx, himl->cy,
n * width, 0, width, height, mask_bits, mask_info, DIB_RGB_COLORS, SRCCOPY );
}
add_dib_bits( himl, pos, count, width, height, info, mask_info, bits, mask_bits );
ret = TRUE;
done:
@ -2069,17 +2089,6 @@ ImageList_Merge (HIMAGELIST himl1, INT i1, HIMAGELIST himl2, INT i2,
}
/***********************************************************************
* DIB_GetDIBImageBytes
*
* Return the number of bytes used to hold the image in a DIB bitmap.
*/
static int DIB_GetDIBImageBytes( int width, int height, int depth )
{
return (((width * depth + 31) / 8) & ~3) * abs( height );
}
/* helper for ImageList_Read, see comments below */
static BOOL _read_bitmap(HDC hdcIml, LPSTREAM pstm)
{
@ -2112,7 +2121,7 @@ static BOOL _read_bitmap(HDC hdcIml, LPSTREAM pstm)
else
palspace = 0;
bmi->bmiHeader.biSizeImage = DIB_GetDIBImageBytes(bmi->bmiHeader.biWidth, bmi->bmiHeader.biHeight, bitsperpixel);
bmi->bmiHeader.biSizeImage = get_dib_image_size( bmi );
/* read the palette right after the end of the bitmapinfoheader */
if (palspace && FAILED(IStream_Read(pstm, bmi->bmiColors, palspace, NULL)))
@ -2902,7 +2911,7 @@ _write_bitmap(HBITMAP hBitmap, LPSTREAM pstm)
return FALSE;
bitCount = bm.bmBitsPixel == 1 ? 1 : 24;
sizeImage = DIB_GetDIBImageBytes(bm.bmWidth, bm.bmHeight, bitCount);
sizeImage = get_dib_stride(bm.bmWidth, bitCount) * bm.bmHeight;
totalSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
if(bitCount != 24)