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/*

 * tixWinImgXpm.c --

 *

 *      Implement the Windows specific function calls for the pixmap

 *      image type.

 *

 * Copyright (c) 1996, Expert Interface Technologies

 *

 * See the file "license.terms" for information on usage and redistribution

 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.

 *

 */

#include <tkInt.h>

#include <tkWinInt.h>

#include <tix.h>

#include <tixImgXpm.h>

typedef struct PixmapData {

    HDC bitmapDC;               /* Bitmap used on Windows platforms */

    HDC maskDC;                 /* Mask used on Windows platforms */

    HBITMAP bitmap, bitmapOld;

    HBITMAP maskBm, maskBmOld;

} PixmapData;

static void             CopyTransparent _ANSI_ARGS_((Display* display,

                            HDC srcDC, Drawable dest,

                            int src_x, int src_y, int width,

                            int height, int dest_x, int dest_y,

                            HDC maskDC));

/*----------------------------------------------------------------------

 * TixpInitPixmapInstance --

 *

 *      Initializes the platform-specific data of a pixmap instance

 *

 *----------------------------------------------------------------------

 */

void

TixpInitPixmapInstance(masterPtr, instancePtr)

    PixmapMaster *masterPtr;    /* Pointer to master for image. */

    PixmapInstance *instancePtr;/* The pixmap instance. */

{

    PixmapData * dataPtr;

    dataPtr = (PixmapData *)ckalloc(sizeof(PixmapData));

    dataPtr->maskDC = NULL;

    dataPtr->bitmapDC = NULL;

    instancePtr->clientData = (ClientData)dataPtr;

}

/*----------------------------------------------------------------------

 * TixpXpmAllocTmpBuffer --

 *

 *      Allocate a temporary space to draw the image.

 *

 *----------------------------------------------------------------------

 */

void

TixpXpmAllocTmpBuffer(masterPtr, instancePtr, imagePtr, maskPtr)

    PixmapMaster * masterPtr;

    PixmapInstance * instancePtr;

    XImage ** imagePtr;

    XImage ** maskPtr;

{

    XImage * image = NULL;              /* Unused. Always return NULL. */

    XImage * mask;

    Display *display = Tk_Display(instancePtr->tkwin);

    int depth;

    int maskSize;

    int i;

    int wordBits  = sizeof(WORD)*8;             /* # of bits in WORD */

    int wordBytes = sizeof(WORD)/sizeof(char);  /* # of bytes in WORD */

    int words_per_line;

    depth = Tk_Depth(instancePtr->tkwin);

    instancePtr->pixmap = Tk_GetPixmap(display,

        Tk_WindowId(instancePtr->tkwin),

        masterPtr->size[0], masterPtr->size[1], depth);

    mask = (XImage*)ckalloc(sizeof(XImage));

    mask->width = masterPtr->size[0];

    mask->height = masterPtr->size[1];

    /*

     * In Windows, each scan line in the the mask data must be aligned

     * to words. The padding bits must be zero'ed.

     */

    words_per_line = (mask->width + (wordBits-1))/wordBits;

    mask->bytes_per_line = words_per_line * wordBytes;

    maskSize = mask->bytes_per_line  * mask->height;

    mask->data = (char *)ckalloc(maskSize);

    for (i=0; i<maskSize; i++) {

        mask->data[i] = 0;

    }

    *imagePtr = image;

    *maskPtr = mask;

}

void

TixpXpmFreeTmpBuffer(masterPtr, instancePtr, image, mask)

    PixmapMaster * masterPtr;

    PixmapInstance * instancePtr;

    XImage * image;

    XImage * mask;

{

    if (image) {

        ckfree((char*)image->data);

        image->data = NULL;

        XDestroyImage(image);

    }

    if (mask) {

        ckfree((char*)mask->data);

        mask->data = NULL;

        ckfree((char*)mask);

    }

}

/*----------------------------------------------------------------------

 * TixpXpmSetPixel --

 *

 *      Sets the pixel at the given (x,y) coordinate to be the given

 *      color.

 *----------------------------------------------------------------------

 */

void

TixpXpmSetPixel(instancePtr, image, mask, x, y, colorPtr, isTranspPtr)

    PixmapInstance * instancePtr;

    XImage * image;

    XImage * mask;

    int x;

    int y;

    XColor * colorPtr;

    int * isTranspPtr;

{

    char * p;

    int n;

    GC gc;

    XGCValues gcValues;

    Display *display = Tk_Display(instancePtr->tkwin);

    if (colorPtr != NULL) {

        gcValues.foreground = colorPtr->pixel;

        gc = Tk_GetGC(instancePtr->tkwin, GCForeground, &gcValues);

        XDrawRectangle(display, instancePtr->pixmap, gc, x, y, 1, 1);

        Tk_FreeGC(display, gc);

    }

    p = mask->data;

    p+= y*(mask->bytes_per_line);

    p+= x/8;

    n = x%8;

    if (colorPtr != NULL) {

        *p |=  (1 << (7-n));

    } else {

        *p &= ~(1 << (7-n));

        *isTranspPtr = 1;

    }

}

/*----------------------------------------------------------------------

 * TixpXpmRealizePixmap --

 *

 *      On Unix:        Create the pixmap from the buffer.

 *      On Windows:     Free the mask if there are no transparent pixels.

 *----------------------------------------------------------------------

 */

void

TixpXpmRealizePixmap(masterPtr, instancePtr, image, mask, isTransp)

    PixmapMaster * masterPtr;

    PixmapInstance * instancePtr;

    XImage * image;

    XImage * mask;

{

    Display *display = Tk_Display(instancePtr->tkwin);

    PixmapData *dataPtr = (PixmapData*)instancePtr->clientData;

    HDC dc, bitmapDC;

    TkWinDCState dcState;

    HBITMAP bitmap, bitmapOld;

    int w, h;

    w = masterPtr->size[0];

    h = masterPtr->size[1];

    dc = TkWinGetDrawableDC(display, instancePtr->pixmap, &dcState);

    bitmapDC = CreateCompatibleDC(dc);

    bitmap = CreateCompatibleBitmap(dc, w, h);

    bitmapOld = SelectObject(bitmapDC, bitmap);

    BitBlt(bitmapDC, 0, 0, w, h, dc, 0, 0, SRCCOPY);

    if (isTransp) {

        HDC maskDC;

        HBITMAP maskBm, maskBmOld;

        /*

         * There are transparent pixels. We need a mask.

         */

        maskDC = CreateCompatibleDC(dc);

        maskBm = CreateBitmap(w, h, 1, 1, (CONST VOID*)mask->data);

        maskBmOld = SelectObject(maskDC, maskBm);

        BitBlt(bitmapDC, 0, 0, w, h, maskDC, 0, 0, SRCAND);

        BitBlt(maskDC,   0, 0, w, h, maskDC, 0, 0, NOTSRCCOPY);

        TkWinReleaseDrawableDC(instancePtr->pixmap, dc, &dcState);

        dataPtr->maskDC = maskDC;

        dataPtr->maskBm = maskBm;

        dataPtr->maskBmOld = maskBmOld;

    } else {

        dataPtr->maskDC = NULL;

    }

    dataPtr->bitmapDC = bitmapDC;

    dataPtr->bitmap = bitmap;

    dataPtr->bitmapOld = bitmapOld;

}

void

TixpXpmFreeInstanceData(instancePtr, delete, display)

    PixmapInstance *instancePtr;        /* Pixmap instance. */

    int delete;                         /* Should the instance data structure

                                         * be deleted as well? */

    Display * display;                  /* Unused on Windows. */

{

    PixmapData *dataPtr = (PixmapData*)instancePtr->clientData;

    if (dataPtr->maskDC != NULL) {

        DeleteObject(SelectObject(dataPtr->maskDC,

            dataPtr->maskBmOld));

        DeleteDC(dataPtr->maskDC);

        dataPtr->maskDC = NULL;

    }

    if (dataPtr->bitmapDC != NULL) {

        DeleteObject(SelectObject(dataPtr->bitmapDC,

            dataPtr->bitmapOld));

        DeleteDC(dataPtr->bitmapDC);

        dataPtr->bitmapDC = NULL;

    }

    if (delete) {

        ckfree((char*)dataPtr);

        instancePtr->clientData = NULL;

    }

}

void

TixpXpmDisplay(clientData, display, drawable, imageX, imageY, width,

        height, drawableX, drawableY)

    ClientData clientData;      /* Pointer to PixmapInstance structure for

                                 * for instance to be displayed. */

    Display *display;           /* Display on which to draw image. */

    Drawable drawable;          /* Pixmap or window in which to draw image. */

    int imageX, imageY;         /* Upper-left corner of region within image

                                 * to draw. */

    int width, height;          /* Dimensions of region within image to draw.*/

    int drawableX, drawableY;   /* Coordinates within drawable that

                                 * correspond to imageX and imageY. */

{

    PixmapInstance *instancePtr = (PixmapInstance *) clientData;

    PixmapData *dataPtr = (PixmapData*)instancePtr->clientData;

    CopyTransparent(display, dataPtr->bitmapDC, drawable,

        imageX, imageY, width, height,

        drawableX, drawableY, dataPtr->maskDC);

}

static void

CopyTransparent(display, srcDC, dest, src_x, src_y, width, height, dest_x,

        dest_y, maskDC)

    Display* display;

    HDC srcDC;

    Drawable dest;

    int src_x;

    int src_y;

    int width;

    int height;

    int dest_x;

    int dest_y;

    HDC maskDC;

{

    HDC destDC;

    TkWinDCState destState;

    destDC = TkWinGetDrawableDC(display, dest, &destState);

    if (maskDC) {

        BitBlt(destDC, dest_x, dest_y, width, height, maskDC, src_x, src_y,

            SRCAND);

        BitBlt(destDC, dest_x, dest_y, width, height, srcDC, src_x, src_y,

            SRCPAINT);

    } else {

        BitBlt(destDC, dest_x, dest_y, width, height, srcDC, src_x, src_y,

            SRCCOPY);

    }

    TkWinReleaseDrawableDC(dest, destDC, &destState);

}