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/** \file
* \brief Cairo Double Buffer Driver
*
* See Copyright Notice in cd.h
*/
#include "cdcairoctx.h"
#include "cddbuf.h"
#include <stdlib.h>
#include <stdio.h>
static void cdkillcanvas (cdCtxCanvas* ctxcanvas)
{
cdKillImage(ctxcanvas->image_dbuffer);
cdcairoKillCanvas(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 */
cairo_show_page(ctxcanvas->cr);
/* 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 = cdcairoCreateCanvas(canvas, ctximage->cr);
if (!ctxcanvas)
return;
ctxcanvas->image_dbuffer = image_dbuffer;
ctxcanvas->canvas_dbuffer = canvas_dbuffer;
canvas->w = ctximage->w;
canvas->h = ctximage->h;
canvas->w_mm = ctximage->w_mm;
canvas->h_mm = ctximage->h_mm;
canvas->bpp = ctximage->bpp;
canvas->xres = ctximage->xres;
canvas->yres = ctximage->yres;
}
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);
cdcairoKillCanvas(old_ctxcanvas);
ctxcanvas = canvas->ctxcanvas;
/* update canvas attributes */
canvas->cxBackground(ctxcanvas, canvas->background);
canvas->cxForeground(ctxcanvas, canvas->foreground);
canvas->cxBackOpacity(ctxcanvas, canvas->back_opacity);
canvas->cxWriteMode(ctxcanvas, canvas->write_mode);
canvas->cxLineStyle(ctxcanvas, canvas->line_style);
canvas->cxLineWidth(ctxcanvas, canvas->line_width);
canvas->cxLineCap(ctxcanvas, canvas->line_cap);
canvas->cxLineJoin(ctxcanvas, canvas->line_join);
canvas->cxHatch(ctxcanvas, canvas->hatch_style);
if (canvas->stipple) canvas->cxStipple(ctxcanvas, canvas->stipple_w, canvas->stipple_h, canvas->stipple);
if (canvas->pattern) canvas->cxPattern(ctxcanvas, canvas->pattern_w, canvas->pattern_h, canvas->pattern);
canvas->cxInteriorStyle(ctxcanvas, canvas->interior_style);
canvas->cxFont(ctxcanvas, canvas->font_type_face, canvas->font_style, canvas->font_size);
/* canvas->cxTextAlignment(ctxcanvas, canvas->text_alignment); */
/* canvas->cxTextOrientation(ctxcanvas, canvas->text_orientation); */
if (canvas->clip_mode == CD_CLIPAREA && canvas->cxClipArea) canvas->cxClipArea(ctxcanvas, canvas->clip_rect.xmin, canvas->clip_rect.xmax, canvas->clip_rect.ymin, canvas->clip_rect.ymax);
/* if (canvas->clip_mode == CD_CLIPAREA && canvas->cxFClipArea) canvas->cxFClipArea(ctxcanvas, canvas->clip_frect.xmin, canvas->clip_frect.xmax, canvas->clip_frect.ymin, canvas->clip_frect.ymax); */
if (canvas->clip_mode == CD_CLIPPOLYGON && canvas->clip_poly) canvas->cxPoly(ctxcanvas, CD_CLIP, canvas->clip_poly, canvas->clip_poly_n);
/* if (canvas->clip_mode == CD_CLIPPOLYGON && canvas->clip_fpoly) canvas->cxFPoly(ctxcanvas, CD_CLIP, canvas->clip_fpoly, canvas->clip_poly_n); */
if (canvas->clip_mode != CD_CLIPOFF) canvas->cxClip(ctxcanvas, canvas->clip_mode);
}
return CD_OK;
}
static void cdinittable(cdCanvas* canvas)
{
cdcairoInitTable(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_REGION | CD_CAP_WRITEMODE | CD_CAP_PALETTE ),
0,
cdcreatecanvas,
cdinittable,
NULL,
NULL,
};
cdContext* cdContextCairoDBuffer(void)
{
return &cdDBufferContext;
}
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