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;
}
cdCanvas *cdCreateCanvas(cdContext* context, void *data_str)
{
cdCanvas *canvas;
/* usefull for NULL drivers, that do nothing and exist only for portability */
if (!context)
return NULL;
{
static int first = 1;
char* env = getenv("CD_QUIET");
if (first && env && strcmp(env, "NO") == 0) /* default is quiet */
{
printf("CD " CD_VERSION CD_VERSION_FIX " " CD_COPYRIGHT "\n");
first = 0;
}
}
/* alocates and initialize everything with 0s */
canvas = (cdCanvas*)malloc(sizeof(cdCanvas));
memset(canvas, 0, sizeof(cdCanvas));
canvas->signature[0] = 'C';
canvas->signature[1] = 'D';
canvas->vector_font = cdCreateVectorFont(canvas);
canvas->simulation = cdCreateSimulation(canvas);
canvas->context = context;
/* initialize default attributes, must be before creating the canvas */
cd_setdefaultattrib(canvas);
context->cxCreateCanvas(canvas, data_str);
if (!canvas->ctxcanvas)
{
cdKillVectorFont(canvas->vector_font);
cdKillSimulation(canvas->simulation);
memset(canvas, 0, sizeof(cdCanvas));
free(canvas);
return NULL;
}
/* default simulation functions */
cd_setdefaultfunc(canvas);
/* initialize canvas table */
context->cxInitTable(canvas);
/* update the default atributes, must be after InitTable */
cdCanvasActivate(canvas);
cdUpdateAttributes(canvas);
/* must be after creating the canvas, so that we know canvas width and height */
canvas->clip_rect.xmax = canvas->w-1;
canvas->clip_rect.ymax = canvas->h-1;
wdSetDefaults(canvas);
return canvas;
}
