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/** \file
* \brief Gdk Double Buffer Driver
*
* See Copyright Notice in cd.h
*/
#include "cdgdk.h"
#include "cddbuf.h"
#include <stdlib.h>
#include <stdio.h>
static void cdkillcanvas (cdCtxCanvas* ctxcanvas)
{
cdKillImage(ctxcanvas->image_dbuffer);
cdgdkKillCanvas(ctxcanvas);
}
static void cddeactivate(cdCtxCanvas* ctxcanvas)
{
cdCanvas* canvas_dbuffer = ctxcanvas->canvas_dbuffer;
/* this is done in the canvas_dbuffer context */
cdCanvasDeactivate(canvas_dbuffer);
}
static void cdflush(cdCtxCanvas* ctxcanvas)
{
int old_writemode;
cdImage* image_dbuffer = ctxcanvas->image_dbuffer;
cdCanvas* canvas_dbuffer = ctxcanvas->canvas_dbuffer;
/* flush the writing in the image */
gdk_flush();
/* this is done in the canvas_dbuffer context */
/* Flush can be affected by Origin and Clipping, but not WriteMode */
old_writemode = cdCanvasWriteMode(canvas_dbuffer, CD_REPLACE);
cdCanvasPutImageRect(canvas_dbuffer, image_dbuffer, 0, 0, 0, 0, 0, 0);
cdCanvasWriteMode(canvas_dbuffer, old_writemode);
}
static void cdcreatecanvas(cdCanvas* canvas, cdCanvas* canvas_dbuffer)
{
int w, h;
cdCtxCanvas* ctxcanvas;
cdImage* image_dbuffer;
cdCtxImage* ctximage;
cdCanvasActivate(canvas_dbuffer);
w = canvas_dbuffer->w;
h = canvas_dbuffer->h;
if (w==0) w=1;
if (h==0) h=1;
/* this is done in the canvas_dbuffer context */
image_dbuffer = cdCanvasCreateImage(canvas_dbuffer, w, h);
if (!image_dbuffer)
return;
ctximage = image_dbuffer->ctximage;
/* Init the driver DBuffer */
ctxcanvas = cdgdkCreateCanvas(canvas, (GdkDrawable*)ctximage->img, ctximage->scr, ctximage->vis);
if (!ctxcanvas)
return;
ctxcanvas->image_dbuffer = image_dbuffer;
ctxcanvas->canvas_dbuffer = canvas_dbuffer;
}
static int cdactivate(cdCtxCanvas* ctxcanvas)
{
int w, h;
cdCanvas* canvas_dbuffer = ctxcanvas->canvas_dbuffer;
/* this is done in the canvas_dbuffer context */
/* this will update canvas size */
cdCanvasActivate(canvas_dbuffer);
w = canvas_dbuffer->w;
h = canvas_dbuffer->h;
if (w==0) w=1;
if (h==0) h=1;
/* check if the size changed */
if (w != ctxcanvas->image_dbuffer->w ||
h != ctxcanvas->image_dbuffer->h)
{
cdCanvas* canvas = ctxcanvas->canvas;
/* save the current, if the rebuild fail */
cdImage* old_image_dbuffer = ctxcanvas->image_dbuffer;
cdCtxCanvas* old_ctxcanvas = ctxcanvas;
/* if the image is rebuild, the canvas that uses the image must be also rebuild */
/* rebuild the image and the canvas */
canvas->ctxcanvas = NULL;
canvas->context->cxCreateCanvas(canvas, canvas_dbuffer);
if (!canvas->ctxcanvas)
{
canvas->ctxcanvas = old_ctxcanvas;
return CD_ERROR;
}
/* remove the old image and canvas */
cdKillImage(old_image_dbuffer);
cdgdkKillCanvas(old_ctxcanvas);
ctxcanvas = canvas->ctxcanvas;
/* update canvas attributes */
cdUpdateAttributes(canvas);
}
return CD_OK;
}
static void cdinittable(cdCanvas* canvas)
{
cdgdkInitTable(canvas);
canvas->cxActivate = cdactivate;
canvas->cxDeactivate = cddeactivate;
canvas->cxFlush = cdflush;
canvas->cxKillCanvas = cdkillcanvas;
}
static cdContext cdDBufferContext =
{
CD_CAP_ALL & ~(CD_CAP_PLAY | CD_CAP_YAXIS | CD_CAP_PATH | CD_CAP_BEZIER | CD_CAP_FPRIMTIVES ),
CD_CTX_IMAGE,
cdcreatecanvas,
cdinittable,
NULL,
NULL,
};
cdContext* cdContextDBuffer(void)
{
if (cdUseContextPlus(CD_QUERY))
{
cdContext* ctx = cdGetContextPlus(CD_CTXPLUS_DBUFFER);
if (ctx != NULL)
return ctx;
}
return &cdDBufferContext;
}
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