/*
* tkWinImage.c --
*
* This file contains routines for manipulation full-color images.
*
* Copyright (c) 1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkWinImage.c,v 1.9 2005/12/02 00:19:04 dkf Exp $
*/
#include "tkWinInt.h"
static int DestroyImage(XImage* data);
static unsigned long ImageGetPixel(XImage *image, int x, int y);
static int PutPixel(XImage *image, int x, int y,
unsigned long pixel);
/*
*----------------------------------------------------------------------
*
* DestroyImage --
*
* This is a trivial wrapper around ckfree to make it possible to pass
* ckfree as a pointer.
*
* Results:
* None.
*
* Side effects:
* Deallocates the image.
*
*----------------------------------------------------------------------
*/
static int
DestroyImage(
XImage *imagePtr) /* Image to free. */
{
if (imagePtr) {
if (imagePtr->data) {
ckfree((char*)imagePtr->data);
}
ckfree((char*)imagePtr);
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* ImageGetPixel --
*
* Get a single pixel from an image.
*
* Results:
* Returns the 32 bit pixel value.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static unsigned long
ImageGetPixel(
XImage *image,
int x, int y)
{
unsigned long pixel = 0;
unsigned char *srcPtr = &(image->data[(y * image->bytes_per_line)
+ ((x * image->bits_per_pixel) / NBBY)]);
switch (image->bits_per_pixel) {
case 32:
case 24:
pixel = RGB(srcPtr[2], srcPtr[1], srcPtr[0]);
break;
case 16:
pixel = RGB(((((WORD*)srcPtr)[0]) >> 7) & 0xf8,
((((WORD*)srcPtr)[0]) >> 2) & 0xf8,
((((WORD*)srcPtr)[0]) << 3) & 0xf8);
break;
case 8:
pixel = srcPtr[0];
break;
case 4:
pixel = ((x%2) ? (*srcPtr) : ((*srcPtr) >> 4)) & 0x0f;
break;
case 1:
pixel = ((*srcPtr) & (0x80 >> (x%8))) ? 1 : 0;
break;
}
return pixel;
}
/*
*----------------------------------------------------------------------
*
* PutPixel --
*
* Set a single pixel in an image.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
PutPixel(
XImage *image,
int x, int y,
unsigned long pixel)
{
unsigned char *destPtr = &(image->data[(y * image->bytes_per_line)
+ ((x * image->bits_per_pixel) / NBBY)]);
switch (image->bits_per_pixel) {
case 32:
/*
* Pixel is DWORD: 0x00BBGGRR
*/
destPtr[3] = 0;
case 24:
/*
* Pixel is triplet: 0xBBGGRR.
*/
destPtr[0] = (unsigned char) GetBValue(pixel);
destPtr[1] = (unsigned char) GetGValue(pixel);
destPtr[2] = (unsigned char) GetRValue(pixel);
break;
case 16:
/*
* Pixel is WORD: 5-5-5 (R-G-B)
*/
(*(WORD*)destPtr) = ((GetRValue(pixel) & 0xf8) << 7)
| ((GetGValue(pixel) & 0xf8) <<2)
| ((GetBValue(pixel) & 0xf8) >> 3);
break;
case 8:
/*
* Pixel is 8-bit index into color table.
*/
(*destPtr) = (unsigned char) pixel;
break;
case 4:
/*
* Pixel is 4-bit index in MSBFirst order.
*/
if (x%2) {
(*destPtr) = (unsigned char) (((*destPtr) & 0xf0)
| (pixel & 0x0f));
} else {
(*destPtr) = (unsigned char) (((*destPtr) & 0x0f)
| ((pixel << 4) & 0xf0));
}
break;
case 1: {
/*
* Pixel is bit in MSBFirst order.
*/
int mask = (0x80 >> (x%8));
if (pixel) {
(*destPtr) |= mask;
} else {
(*destPtr) &= ~mask;
}
break;
}
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* XCreateImage --
*
* Allocates storage for a new XImage.
*
* Results:
* Returns a newly allocated XImage.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
XImage *
XCreateImage(
Display *display,
Visual *visual,
unsigned int depth,
int format,
int offset,
char *data,
unsigned int width,
unsigned int height,
int bitmap_pad,
int bytes_per_line)
{
XImage* imagePtr = (XImage *) ckalloc(sizeof(XImage));
imagePtr->width = width;
imagePtr->height = height;
imagePtr->xoffset = offset;
imagePtr->format = format;
imagePtr->data = data;
imagePtr->byte_order = LSBFirst;
imagePtr->bitmap_unit = 8;
imagePtr->bitmap_bit_order = LSBFirst;
imagePtr->bitmap_pad = bitmap_pad;
imagePtr->bits_per_pixel = depth;
imagePtr->depth = depth;
/*
* Under Windows, bitmap_pad must be on an LONG data-type boundary.
*/
#define LONGBITS (sizeof(LONG) * 8)
bitmap_pad = (bitmap_pad + LONGBITS - 1) / LONGBITS * LONGBITS;
/*
* Round to the nearest bitmap_pad boundary.
*/
if (bytes_per_line) {
imagePtr->bytes_per_line = bytes_per_line;
} else {
imagePtr->bytes_per_line = (((depth * width)
+ (bitmap_pad - 1)) >> 3) & ~((bitmap_pad >> 3) - 1);
}
imagePtr->red_mask = 0;
imagePtr->green_mask = 0;
imagePtr->blue_mask = 0;
imagePtr->f.put_pixel = PutPixel;
imagePtr->f.get_pixel = ImageGetPixel;
imagePtr->f.destroy_image = DestroyImage;
imagePtr->f.create_image = NULL;
imagePtr->f.sub_image = NULL;
imagePtr->f.add_pixel = NULL;
return imagePtr;
}
/*
*----------------------------------------------------------------------
*
* XGetImageZPixmap --
*
* This function copies data from a pixmap or window into an XImage. This
* handles the ZPixmap case only.
*
* Results:
* Returns a newly allocated image containing the data from the given
* rectangle of the given drawable.
*
* Side effects:
* None.
*
* This procedure is adapted from the XGetImage implementation in TkNT. That
* code is Copyright (c) 1994 Software Research Associates, Inc.
*
*----------------------------------------------------------------------
*/
static XImage *
XGetImageZPixmap(
Display *display,
Drawable d,
int x, int y,
unsigned int width, unsigned int height,
unsigned long plane_mask,
int format)
{
TkWinDrawable *twdPtr = (TkWinDrawable *)d;
XImage *ret_image;
HDC hdc, hdcMem;
HBITMAP hbmp, hbmpPrev;
BITMAPINFO *bmInfo = NULL;
HPALETTE hPal, hPalPrev1, hPalPrev2;
int size;
unsigned int n;
unsigned int depth;
unsigned char *data;
TkWinDCState state;
BOOL ret;
if (format != ZPixmap) {
TkpDisplayWarning(
"XGetImageZPixmap: only ZPixmap types are implemented",
"XGetImageZPixmap Failure");
return NULL;
}
hdc = TkWinGetDrawableDC(display, d, &state);
/*
* Need to do a Blt operation to copy into a new bitmap.
*/
hbmp = CreateCompatibleBitmap(hdc, width, height);
hdcMem = CreateCompatibleDC(hdc);
hbmpPrev = SelectObject(hdcMem, hbmp);
hPal = state.palette;
if (hPal) {
hPalPrev1 = SelectPalette(hdcMem, hPal, FALSE);
n = RealizePalette(hdcMem);
if (n > 0) {
UpdateColors (hdcMem);
}
hPalPrev2 = SelectPalette(hdc, hPal, FALSE);
n = RealizePalette(hdc);
if (n > 0) {
UpdateColors (hdc);
}
}
ret = BitBlt(hdcMem, 0, 0, width, height, hdc, x, y, SRCCOPY);
if (hPal) {
SelectPalette(hdc, hPalPrev2, FALSE);
}
SelectObject(hdcMem, hbmpPrev);
TkWinReleaseDrawableDC(d, hdc, &state);
if (ret == FALSE) {
goto cleanup;
}
if (twdPtr->type == TWD_WINDOW) {
depth = Tk_Depth((Tk_Window) twdPtr->window.winPtr);
} else {
depth = twdPtr->bitmap.depth;
}
size = sizeof(BITMAPINFO);
if (depth <= 8) {
size += sizeof(unsigned short) * (1 << depth);
}
bmInfo = (BITMAPINFO *) ckalloc(size);
bmInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmInfo->bmiHeader.biWidth = width;
bmInfo->bmiHeader.biHeight = -(int) height;
bmInfo->bmiHeader.biPlanes = 1;
bmInfo->bmiHeader.biBitCount = depth;
bmInfo->bmiHeader.biCompression = BI_RGB;
bmInfo->bmiHeader.biSizeImage = 0;
bmInfo->bmiHeader.biXPelsPerMeter = 0;
bmInfo->bmiHeader.biYPelsPerMeter = 0;
bmInfo->bmiHeader.biClrUsed = 0;
bmInfo->bmiHeader.biClrImportant = 0;
if (depth == 1) {
unsigned char *p, *pend;
GetDIBits(hdcMem, hbmp, 0, height, NULL, bmInfo, DIB_PAL_COLORS);
data = ckalloc(bmInfo->bmiHeader.biSizeImage);
if (!data) {
/* printf("Failed to allocate data area for XImage.\n"); */
ret_image = NULL;
goto cleanup;
}
ret_image = XCreateImage(display, NULL, depth, ZPixmap, 0, data,
width, height, 32, ((width + 31) >> 3) & ~1);
if (ret_image == NULL) {
ckfree(data);
goto cleanup;
}
/*
* Get the BITMAP info into the Image.
*/
if (GetDIBits(hdcMem, hbmp, 0, height, data, bmInfo,
DIB_PAL_COLORS) == 0) {
ckfree((char *) ret_image->data);
ckfree((char *) ret_image);
ret_image = NULL;
goto cleanup;
}
p = data;
pend = data + bmInfo->bmiHeader.biSizeImage;
while (p < pend) {
*p = ~*p;
p++;
}
} else if (depth == 8) {
unsigned short *palette;
unsigned int i;
unsigned char *p;
GetDIBits(hdcMem, hbmp, 0, height, NULL, bmInfo, DIB_PAL_COLORS);
data = ckalloc(bmInfo->bmiHeader.biSizeImage);
if (!data) {
/* printf("Failed to allocate data area for XImage.\n"); */
ret_image = NULL;
goto cleanup;
}
ret_image = XCreateImage(display, NULL, 8, ZPixmap, 0, data,
width, height, 8, width);
if (ret_image == NULL) {
ckfree((char *) data);
goto cleanup;
}
/*
* Get the BITMAP info into the Image.
*/
if (GetDIBits(hdcMem, hbmp, 0, height, data, bmInfo,
DIB_PAL_COLORS) == 0) {
ckfree((char *) ret_image->data);
ckfree((char *) ret_image);
ret_image = NULL;
goto cleanup;
}
p = data;
palette = (unsigned short *) bmInfo->bmiColors;
for (i = 0; i < bmInfo->bmiHeader.biSizeImage; i++, p++) {
*p = (unsigned char) palette[*p];
}
} else if (depth == 16) {
GetDIBits(hdcMem, hbmp, 0, height, NULL, bmInfo, DIB_RGB_COLORS);
data = ckalloc(bmInfo->bmiHeader.biSizeImage);
if (!data) {
/* printf("Failed to allocate data area for XImage.\n"); */
ret_image = NULL;
goto cleanup;
}
ret_image = XCreateImage(display, NULL, 16, ZPixmap, 0, data,
width, height, 16, 0 /* will be calc'ed from bitmap_pad */);
if (ret_image == NULL) {
ckfree((char *) data);
goto cleanup;
}
/*
* Get the BITMAP info directly into the Image.
*/
if (GetDIBits(hdcMem, hbmp, 0, height, ret_image->data, bmInfo,
DIB_RGB_COLORS) == 0) {
ckfree((char *) ret_image->data);
ckfree((char *) ret_image);
ret_image = NULL;
goto cleanup;
}
} else {
GetDIBits(hdcMem, hbmp, 0, height, NULL, bmInfo, DIB_RGB_COLORS);
data = ckalloc(width * height * 4);
if (!data) {
/* printf("Failed to allocate data area for XImage.\n"); */
ret_image = NULL;
goto cleanup;
}
ret_image = XCreateImage(display, NULL, 32, ZPixmap, 0, data,
width, height, 0, width * 4);
if (ret_image == NULL) {
ckfree((char *) data);
goto cleanup;
}
if (depth <= 24) {
/*
* This used to handle 16 and 24 bpp, but now just handles 24. It
* can likely be optimized for that. -- hobbs
*/
unsigned char *smallBitData, *smallBitBase, *bigBitData;
unsigned int byte_width, h, w;
byte_width = ((width * 3 + 3) & ~3);
smallBitBase = ckalloc(byte_width * height);
if (!smallBitBase) {
ckfree((char *) ret_image->data);
ckfree((char *) ret_image);
ret_image = NULL;
goto cleanup;
}
smallBitData = smallBitBase;
/*
* Get the BITMAP info into the Image.
*/
if (GetDIBits(hdcMem, hbmp, 0, height, smallBitData, bmInfo,
DIB_RGB_COLORS) == 0) {
ckfree((char *) ret_image->data);
ckfree((char *) ret_image);
ckfree((char *) smallBitBase);
ret_image = NULL;
goto cleanup;
}
/*
* Copy the 24 Bit Pixmap to a 32-Bit one.
*/
for (h = 0; h < height; h++) {
bigBitData = ret_image->data + h * ret_image->bytes_per_line;
smallBitData = smallBitBase + h * byte_width;
for (w = 0; w < width; w++) {
*bigBitData++ = ((*smallBitData++));
*bigBitData++ = ((*smallBitData++));
*bigBitData++ = ((*smallBitData++));
*bigBitData++ = 0;
}
}
/*
* Free the Device contexts, and the Bitmap.
*/
ckfree((char *) smallBitBase);
} else {
/*
* Get the BITMAP info directly into the Image.
*/
if (GetDIBits(hdcMem, hbmp, 0, height, ret_image->data, bmInfo,
DIB_RGB_COLORS) == 0) {
ckfree((char *) ret_image->data);
ckfree((char *) ret_image);
ret_image = NULL;
goto cleanup;
}
}
}
cleanup:
if (bmInfo) {
ckfree((char *) bmInfo);
}
if (hPal) {
SelectPalette(hdcMem, hPalPrev1, FALSE);
}
DeleteDC(hdcMem);
DeleteObject(hbmp);
return ret_image;
}
/*
*----------------------------------------------------------------------
*
* XGetImage --
*
* This function copies data from a pixmap or window into an XImage.
*
* Results:
* Returns a newly allocated image containing the data from the given
* rectangle of the given drawable.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
XImage *
XGetImage(
Display* display,
Drawable d,
int x, int y,
unsigned int width, unsigned int height,
unsigned long plane_mask,
int format)
{
TkWinDrawable *twdPtr = (TkWinDrawable *)d;
XImage *imagePtr;
HDC dc;
display->request++;
if (twdPtr == NULL) {
/*
* Avoid unmapped windows or bad drawables
*/
return NULL;
}
if (twdPtr->type != TWD_BITMAP) {
/*
* This handles TWD_WINDOW or TWD_WINDC, always creating a 32bit
* image. If the window being copied isn't visible (unmapped or
* obscured), we quietly stop copying (no user error). The user will
* see black where the widget should be. This branch is likely
* followed in favor of XGetImageZPixmap as postscript printed widgets
* require RGB data.
*/
TkWinDCState state;
unsigned int xx, yy, size;
COLORREF pixel;
dc = TkWinGetDrawableDC(display, d, &state);
imagePtr = XCreateImage(display, NULL, 32, format, 0, NULL,
width, height, 32, 0);
size = imagePtr->bytes_per_line * imagePtr->height;
imagePtr->data = ckalloc(size);
ZeroMemory(imagePtr->data, size);
for (yy = 0; yy < height; yy++) {
for (xx = 0; xx < width; xx++) {
pixel = GetPixel(dc, x+(int)xx, y+(int)yy);
if (pixel == CLR_INVALID) {
break;
}
PutPixel(imagePtr, xx, yy, pixel);
}
}
TkWinReleaseDrawableDC(d, dc, &state);
} else if (format == ZPixmap) {
/*
* This actually handles most TWD_WINDOW requests, but it varies from
* the above in that it really does a screen capture of an area, which
* is consistent with the Unix behavior, but does not appear to handle
* all bit depths correctly. -- hobbs
*/
imagePtr = XGetImageZPixmap(display, d, x, y,
width, height, plane_mask, format);
} else {
char *errMsg = NULL;
char infoBuf[sizeof(BITMAPINFO) + sizeof(RGBQUAD)];
BITMAPINFO *infoPtr = (BITMAPINFO*)infoBuf;
if (twdPtr->bitmap.handle == NULL) {
errMsg = "XGetImage: not implemented for empty bitmap handles";
} else if (format != XYPixmap) {
errMsg = "XGetImage: not implemented for format != XYPixmap";
} else if (plane_mask != 1) {
errMsg = "XGetImage: not implemented for plane_mask != 1";
}
if (errMsg != NULL) {
/*
* Do a soft warning for the unsupported XGetImage types.
*/
TkpDisplayWarning(errMsg, "XGetImage Failure");
return NULL;
}
imagePtr = XCreateImage(display, NULL, 1, XYBitmap, 0, NULL,
width, height, 32, 0);
imagePtr->data = ckalloc(imagePtr->bytes_per_line * imagePtr->height);
dc = GetDC(NULL);
GetDIBits(dc, twdPtr->bitmap.handle, 0, height, NULL,
infoPtr, DIB_RGB_COLORS);
infoPtr->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
infoPtr->bmiHeader.biWidth = width;
infoPtr->bmiHeader.biHeight = -(LONG)height;
infoPtr->bmiHeader.biPlanes = 1;
infoPtr->bmiHeader.biBitCount = 1;
infoPtr->bmiHeader.biCompression = BI_RGB;
infoPtr->bmiHeader.biSizeImage = 0;
infoPtr->bmiHeader.biXPelsPerMeter = 0;
infoPtr->bmiHeader.biYPelsPerMeter = 0;
infoPtr->bmiHeader.biClrUsed = 0;
infoPtr->bmiHeader.biClrImportant = 0;
GetDIBits(dc, twdPtr->bitmap.handle, 0, height, imagePtr->data,
infoPtr, DIB_RGB_COLORS);
ReleaseDC(NULL, dc);
}
return imagePtr;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/