#include <cairo.h>

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include <libnr/n-art-bpath.h>

#include <libnr/nr-matrix-ops.h>

#include <libnr/nr-matrix-fns.h>

#include <libnr/nr-pixblock.h>

#include "../style.h"

#include "nr-arena.h"

cairo_t *

nr_create_cairo_context (NRRectL *area, NRPixBlock *pb)

{

if (!nr_rect_l_test_intersect (&pb->area, area))

return NULL;

NRRectL clip;

nr_rect_l_intersect (&clip, &pb->area, area);

unsigned char *dpx = NR_PIXBLOCK_PX (pb) + (clip.y0 - pb->area.y0) * pb->rs + NR_PIXBLOCK_BPP (pb) * (clip.x0 - pb->area.x0);

int width = area->x1 - area->x0;

int height = area->y1 - area->y0;

// even though cairo cannot draw in nonpremul mode, select ARGB32 for R8G8B8A8N as the closest; later eliminate R8G8B8A8N everywhere

cairo_surface_t* cst = cairo_image_surface_create_for_data

(dpx,

((pb->mode == NR_PIXBLOCK_MODE_R8G8B8A8P || pb->mode == NR_PIXBLOCK_MODE_R8G8B8A8N) ? CAIRO_FORMAT_ARGB32 : (pb->mode == NR_PIXBLOCK_MODE_R8G8B8? CAIRO_FORMAT_RGB24 : CAIRO_FORMAT_A8)),

width,

height,

pb->rs);

cairo_t *ct = cairo_create (cst);

return ct;

}

feed_curve_to_cairo (cairo_t *ct, NArtBpath *bpath, NR::Matrix trans, NR::Point shift)

{

NR::Point lastX(0,0);

bool closed = false;

for (int i = 0; bpath[i].code != NR_END; i++) {

switch (bpath[i].code) {

case NR_MOVETO_OPEN:

case NR_MOVETO:

if (closed) cairo_close_path(ct);

closed = (bpath[i].code == NR_MOVETO);

lastX[NR::X] = bpath[i].x3;

lastX[NR::Y] = bpath[i].y3;

lastX *= trans;

lastX -= shift;

cairo_move_to(ct, lastX[NR::X], lastX[NR::Y]);

break;

case NR_LINETO:

lastX[NR::X] = bpath[i].x3;

lastX[NR::Y] = bpath[i].y3;

lastX *= trans;

lastX -= shift;

cairo_line_to(ct, lastX[NR::X], lastX[NR::Y]);

break;

case NR_CURVETO: {

NR::Point tm1, tm2, tm3;

tm1[0]=bpath[i].x1;

tm1[1]=bpath[i].y1;

tm2[0]=bpath[i].x2;

tm2[1]=bpath[i].y2;

tm3[0]=bpath[i].x3;

tm3[1]=bpath[i].y3;

tm1 *= trans;

tm2 *= trans;

tm3 *= trans;

tm1 -= shift;

tm2 -= shift;

tm3 -= shift;

cairo_curve_to (ct, tm1[NR::X], tm1[NR::Y], tm2[NR::X], tm2[NR::Y], tm3[NR::X], tm3[NR::Y]);

break;

}

default:

break;

}

}

}