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/*

 * tixUnixImgXpm.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 <tixPort.h>

#include <tixUnixInt.h>

#include <tixImgXpm.h>

typedef struct PixmapData {

    Pixmap mask;                /* Mask: only display pixmap pixels where

                                 * there are 1's here. */

    GC gc;                      /* Graphics context for displaying pixmap.

                                 * None means there was an error while

                                 * setting up the instance, so it cannot

                                 * be displayed. */

} PixmapData;

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

 * 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->mask = None;

    dataPtr->gc = None;

    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;

{

    int pad;

    XImage * image = NULL, * mask = NULL;

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

    int depth;

    depth = Tk_Depth(instancePtr->tkwin);

    if (depth > 16) {

        pad = 32;

    } else if (depth > 8) {

        pad = 16;

    } else {

        pad = 8;

    }

    /*

     * Create the XImage structures to store the temporary image

     */

    image = XCreateImage(display,

        Tk_Visual(instancePtr->tkwin),

        depth, ZPixmap, 0, 0,

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

    image->data =

      (char *)ckalloc(image->bytes_per_line * masterPtr->size[1]);

    mask  = XCreateImage(display,

        Tk_Visual(instancePtr->tkwin),

        1, XYPixmap, 0, 0,

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

    mask->data =

      (char *)ckalloc(mask->bytes_per_line  * masterPtr->size[1]);

    *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;

        XDestroyImage(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;

{

    if (colorPtr != NULL) {

        XPutPixel(image, x, y, colorPtr->pixel);

        XPutPixel(mask,  x, y, 1);

    } else {

        XPutPixel(mask,  x, y, 0);

        *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;

    int isTransp;

{

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

    int depth = Tk_Depth(instancePtr->tkwin);

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

    unsigned int gcMask;

    XGCValues gcValues;

    GC gc;

    instancePtr->pixmap = Tk_GetPixmap(display,

        Tk_WindowId(instancePtr->tkwin),

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

    gc = Tk_GetGC(instancePtr->tkwin, 0, NULL);

    XPutImage(display, instancePtr->pixmap,

        gc, image, 0, 0, 0, 0, masterPtr->size[0], masterPtr->size[1]);

    Tk_FreeGC(display, gc);

    if (isTransp) {

        /*

         * There are transparent pixels. We need a mask.

         */

        dataPtr->mask = Tk_GetPixmap(display,

            Tk_WindowId(instancePtr->tkwin),

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

        gc = XCreateGC(display, dataPtr->mask, 0, NULL);

        XPutImage(display, dataPtr->mask,

            gc, mask,  0, 0, 0, 0, masterPtr->size[0], masterPtr->size[1]);

        XFreeGC(display, gc);

    } else {

        dataPtr->mask = None;

    }

    /*

     * Allocate a GC for drawing this instance (mask is not used if there

     * is no transparent pixels inside the image).

     */

    if (dataPtr->mask != None) {

        gcMask = GCGraphicsExposures|GCClipMask;

    } else {

        gcMask = GCGraphicsExposures;

    }

    gcValues.graphics_exposures = False;

    gcValues.clip_mask = dataPtr->mask;

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

    dataPtr->gc = gc;

}

void

TixpXpmFreeInstanceData(instancePtr, delete, display)

    PixmapInstance *instancePtr;/* Pixmap instance. */

    int delete;                 /* Should the instance data structure

                                 * be deleted as well? */

    Display *display;           /* Display containing window that used image.*/

{

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

    if (dataPtr->mask != None) {

        Tk_FreePixmap(display, dataPtr->mask);

        dataPtr->mask = None;

    }

    if (dataPtr->gc != None) {

        Tk_FreeGC(display, dataPtr->gc);

        dataPtr->gc = None;

    }

    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;

    /*

     * If there's no graphics context, it means that an error occurred

     * while creating the image instance so it can't be displayed.

     */

    if (dataPtr->gc == None) {

        return;

    }

    /*

     * We always use clipping: modify the clip origin within

     * the graphics context to line up with the image's origin.

     * Then draw the image and reset the clip origin.

     */

    XSetClipOrigin(display, dataPtr->gc, drawableX - imageX,

        drawableY - imageY);

    XCopyArea(display, instancePtr->pixmap, drawable, dataPtr->gc,

        imageX, imageY, (unsigned) width, (unsigned) height,

        drawableX, drawableY);

    XSetClipOrigin(display, dataPtr->gc, 0, 0);

}