netsurf/amiga/plotters.c

/*
 * Copyright 2008,2009 Chris Young <chris@unsatisfactorysoftware.co.uk>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "amiga/plotters.h"
#include "amiga/bitmap.h"
#include "amiga/font.h"
#include <proto/Picasso96API.h>
#include <intuition/intuition.h>
#include <graphics/rpattr.h>
#include <graphics/gfxmacros.h>
#include "amiga/utf8.h"
#include "amiga/options.h"
#include <graphics/blitattr.h>
#include <graphics/composite.h>
#include "utils/log.h"
#include <math.h>
#include <assert.h>
#include <proto/exec.h>
#include "amiga/gui.h"
#include "utils/utils.h"

static void ami_bitmap_tile_hook(struct Hook *hook,struct RastPort *rp,struct BackFillMessage *bfmsg);

struct bfbitmap {
	struct BitMap *bm;
	ULONG width;
	ULONG height;
	int offsetx;
	int offsety;
};


#ifndef M_PI /* For some reason we don't always get this from math.h */
#define M_PI		3.14159265358979323846
#endif

#ifdef NS_AMIGA_CAIRO
#include <cairo/cairo.h>
#include <cairo/cairo-amigaos.h>
#endif

#define PATT_DOT  0xAAAA
#define PATT_DASH 0xCCCC
#define PATT_LINE 0xFFFF

/* Define the below to get additional debug */
#undef AMI_PLOTTER_DEBUG

struct plotter_table plot;
const struct plotter_table amiplot = {
	.rectangle = ami_rectangle,
	.line = ami_line,
	.polygon = ami_polygon,
	.clip = ami_clip,
	.text = ami_text,
	.disc = ami_disc,
	.arc = ami_arc,
	.bitmap = ami_bitmap_tile,
	.path = ami_path,
	.option_knockout = true,
};

#ifdef NS_AMIGA_CAIRO
void ami_cairo_set_colour(cairo_t *cr,colour c)
{
	int r, g, b;

	r = c & 0xff;
	g = (c & 0xff00) >> 8;
	b = (c & 0xff0000) >> 16;

	cairo_set_source_rgba(glob->cr, r / 255.0,
			g / 255.0, b / 255.0, 1.0);
}

void ami_cairo_set_solid(cairo_t *cr)
{
	double dashes = 0;

	cairo_set_dash(glob->cr, &dashes, 0, 0);
}

void ami_cairo_set_dotted(cairo_t *cr)
{
	double cdashes = 1;

	cairo_set_dash(glob->cr, &cdashes, 1, 0);
}

void ami_cairo_set_dashed(cairo_t *cr)
{
	double cdashes = 3;

	cairo_set_dash(glob->cr, &cdashes, 1, 0);
}
#endif

void ami_init_layers(struct gui_globals *gg, ULONG width, ULONG height)
{
	/* init shared bitmaps                                               *
	 * Height is set to screen width to give enough space for thumbnails *
	 * Also applies to the further gfx/layers functions and memory below */

	if(!width) width = scrn->Width;
	if(!height) height = scrn->Width;

	gg->scale = 1.0;
	gg->layerinfo = NewLayerInfo();
	gg->areabuf = AllocVec(100,MEMF_PRIVATE | MEMF_CLEAR);
	gg->tmprasbuf = AllocVec(width*height,MEMF_PRIVATE | MEMF_CLEAR);

	gg->bm = p96AllocBitMap(width, height, 32,
						BMF_INTERLEAVED, NULL, RGBFB_A8R8G8B8);

	if(!gg->bm) warn_user("NoMemory","");

	InitRastPort(&gg->rp);
	gg->rp.BitMap = gg->bm;

	SetDrMd(&gg->rp,BGBACKFILL);

	gg->rp.Layer = CreateUpfrontLayer(gg->layerinfo,gg->rp.BitMap,0,0,
					width-1, height-1, LAYERSIMPLE, NULL);

	InstallLayerHook(gg->rp.Layer,LAYERS_NOBACKFILL);

	gg->rp.AreaInfo = AllocVec(sizeof(struct AreaInfo),MEMF_PRIVATE | MEMF_CLEAR);

	if((!gg->areabuf) || (!gg->rp.AreaInfo))	warn_user("NoMemory","");

	InitArea(gg->rp.AreaInfo,gg->areabuf,100/5);
	gg->rp.TmpRas = AllocVec(sizeof(struct TmpRas),MEMF_PRIVATE | MEMF_CLEAR);

	if((!gg->tmprasbuf) || (!gg->rp.TmpRas))	warn_user("NoMemory","");

	InitTmpRas(gg->rp.TmpRas, gg->tmprasbuf, width*height);

#ifdef NS_AMIGA_CAIRO
	gg->surface = cairo_amigaos_surface_create(gg->rp.BitMap);
	gg->cr = cairo_create(gg->surface);
#endif
}

void ami_free_layers(struct gui_globals *gg)
{
#ifdef NS_AMIGA_CAIRO
	cairo_destroy(gg->cr);
	cairo_surface_destroy(gg->surface);
#endif
	DeleteLayer(0,gg->rp.Layer);
	FreeVec(gg->rp.TmpRas);
	FreeVec(gg->rp.AreaInfo);

	DisposeLayerInfo(gg->layerinfo);
	p96FreeBitMap(gg->bm);
	FreeVec(gg->tmprasbuf);
	FreeVec(gg->areabuf);
}

bool ami_clg(colour c)
{
	p96RectFill(&glob->rp,0,0,scrn->Width-1,scrn->Width-1,
	p96EncodeColor(RGBFB_A8B8G8R8,c));
/*
	SetRPAttrs(&glob->rp,RPTAG_BPenColor,p96EncodeColor(RGBFB_A8B8G8R8,c),
					TAG_DONE);
	Move(&glob->rp,0,0);
	ClearScreen(&glob->rp);
*/
	return true;
}

void ami_clearclipreg(struct gui_globals *gg)
{
	struct Region *reg = NULL;

	reg = InstallClipRegion(gg->rp.Layer,NULL);
	if(reg) DisposeRegion(reg);

	gg->rect.MinX = 0;
	gg->rect.MinY = 0;
	gg->rect.MaxX = scrn->Width-1;
	gg->rect.MaxY = scrn->Height-1;
}

bool ami_rectangle(int x0, int y0, int x1, int y1, const plot_style_t *style)
{
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_rectangle()"));
	#endif

        if (style->fill_type != PLOT_OP_TYPE_NONE) { 

#ifndef NS_AMIGA_CAIRO_ALL
		p96RectFill(&glob->rp,x0,y0,x1-1,y1-1,
			    p96EncodeColor(RGBFB_A8B8G8R8, style->fill_colour));
#else
		ami_cairo_set_colour(glob->cr, style->fill_colour);
		ami_cairo_set_solid(glob->cr);

		cairo_set_line_width(glob->cr, 0);
		cairo_rectangle(glob->cr, x0, y0, x1 - x0, y1 - y0);
		cairo_fill(glob->cr);
		cairo_stroke(glob->cr);
#endif

	}

        if (style->stroke_type != PLOT_OP_TYPE_NONE) {
#ifndef NS_AMIGA_CAIRO_ALL
		glob->rp.PenWidth = style->stroke_width;
		glob->rp.PenHeight = style->stroke_width;

                switch (style->stroke_type) {
                case PLOT_OP_TYPE_SOLID: /**< Solid colour */
                default:
                        glob->rp.LinePtrn = PATT_LINE;
                        break;

                case PLOT_OP_TYPE_DOT: /**< Doted plot */
                        glob->rp.LinePtrn = PATT_DOT;
                        break;

                case PLOT_OP_TYPE_DASH: /**< dashed plot */
                        glob->rp.LinePtrn = PATT_DASH;
                        break;
                }

		SetRPAttrs(&glob->rp,
			   RPTAG_APenColor,
			   p96EncodeColor(RGBFB_A8B8G8R8, style->stroke_colour),
			   TAG_DONE);
		Move(&glob->rp, x0,y0);
		Draw(&glob->rp, x1, y0);
		Draw(&glob->rp, x1, y1);
		Draw(&glob->rp, x0, y1);
		Draw(&glob->rp, x0, y0);

		glob->rp.PenWidth = 1;
		glob->rp.PenHeight = 1;
		glob->rp.LinePtrn = PATT_LINE;
#else
		ami_cairo_set_colour(glob->cr, style->stroke_colour);

                switch (style->stroke_type) {
                case PLOT_OP_TYPE_SOLID: /**< Solid colour */
                default:
                        ami_cairo_set_solid(glob->cr);
                        break;

                case PLOT_OP_TYPE_DOT: /**< Doted plot */
                        ami_cairo_set_dotted(glob->cr);
                        break;

                case PLOT_OP_TYPE_DASH: /**< dashed plot */
                        ami_cairo_set_dashed(glob->cr);
                        break;
                }

                if (style->stroke_width == 0)
                        cairo_set_line_width(glob->cr, 1);
                else
                        cairo_set_line_width(glob->cr, style->stroke_width);

		cairo_rectangle(glob->cr, x0, y0, x1 - x0, y1 - y0);
		cairo_stroke(glob->cr);
#endif
	}
	return true;
}

bool ami_line(int x0, int y0, int x1, int y1, const plot_style_t *style)
{
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_line()"));
	#endif

#ifndef NS_AMIGA_CAIRO_ALL
	glob->rp.PenWidth = style->stroke_width;
	glob->rp.PenHeight = style->stroke_width;

	switch (style->stroke_type) {
	case PLOT_OP_TYPE_SOLID: /**< Solid colour */
	default:
		glob->rp.LinePtrn = PATT_LINE;
		break;

	case PLOT_OP_TYPE_DOT: /**< Doted plot */
		glob->rp.LinePtrn = PATT_DOT;
		break;

	case PLOT_OP_TYPE_DASH: /**< dashed plot */
		glob->rp.LinePtrn = PATT_DASH;
		break;
	}

	SetRPAttrs(&glob->rp,
		   RPTAG_APenColor,
		   p96EncodeColor(RGBFB_A8B8G8R8, style->stroke_colour),
		   TAG_DONE);
	Move(&glob->rp,x0,y0);
	Draw(&glob->rp,x1,y1);

	glob->rp.PenWidth = 1;
	glob->rp.PenHeight = 1;
	glob->rp.LinePtrn = PATT_LINE;
#else
	ami_cairo_set_colour(glob->cr, style->stroke_colour);

	switch (style->stroke_type) {
	case PLOT_OP_TYPE_SOLID: /**< Solid colour */
	default:
		ami_cairo_set_solid(glob->cr);
		break;

	case PLOT_OP_TYPE_DOT: /**< Doted plot */
		ami_cairo_set_dotted(glob->cr);
		break;

	case PLOT_OP_TYPE_DASH: /**< dashed plot */
		ami_cairo_set_dashed(glob->cr);
		break;
	}

	if (style->stroke_width == 0)
		cairo_set_line_width(glob->cr, 1);
	else
		cairo_set_line_width(glob->cr, style->stroke_width);

	/* core expects horizontal and vertical lines to be on pixels, not
	 * between pixels */
	cairo_move_to(current_cr, (x0 == x1) ? x0 + 0.5 : x0,
			(y0 == y1) ? y0 + 0.5 : y0);
	cairo_line_to(current_cr, (x0 == x1) ? x1 + 0.5 : x1,
			(y0 == y1) ? y1 + 0.5 : y1);
	cairo_stroke(glob->cr);
#endif
	return true;
}

bool ami_polygon(const int *p, unsigned int n, const plot_style_t *style)
{
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_polygon()"));
	#endif

	int k;
#ifndef NS_AMIGA_CAIRO
	ULONG cx,cy;

	SetRPAttrs(&glob->rp,
		   RPTAG_APenColor,
		   p96EncodeColor(RGBFB_A8B8G8R8, style->fill_colour),
		   RPTAG_OPenColor,
		   p96EncodeColor(RGBFB_A8B8G8R8, style->fill_colour),
//					RPTAG_OPenColor,0xffffffff,
		   TAG_DONE);

	AreaMove(&glob->rp,p[0],p[1]);

	for(k=1;k<n;k++)
	{
		AreaDraw(&glob->rp,p[k*2],p[(k*2)+1]);
	}

	AreaEnd(&glob->rp);
	BNDRYOFF(&glob->rp);
#else
	ami_cairo_set_colour(glob->cr, style->fill_colour);
	ami_cairo_set_solid(glob->cr);

	cairo_set_line_width(glob->cr, 0);
	cairo_move_to(glob->cr, p[0], p[1]);
	for (k = 1; k != n; k++) {
		cairo_line_to(glob->cr, p[k * 2], p[k * 2 + 1]);
	}
	cairo_fill(glob->cr);
	cairo_stroke(glob->cr);
#endif

	return true;
}


bool ami_clip(int x0, int y0, int x1, int y1)
{
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_clip()"));
	#endif

	struct Region *reg = NULL;

	if(glob->rp.Layer)
	{
		reg = NewRegion();

		glob->rect.MinX = x0;
		glob->rect.MinY = y0;
		glob->rect.MaxX = x1-1;
		glob->rect.MaxY = y1-1;

		OrRectRegion(reg,&glob->rect);

		reg = InstallClipRegion(glob->rp.Layer,reg);

		if(reg) DisposeRegion(reg);
	}

#ifdef NS_AMIGA_CAIRO_ALL
	cairo_reset_clip(glob->cr);
	cairo_rectangle(glob->cr, x0, y0, x1 - x0, y1 - y0);
	cairo_clip(glob->cr);
#endif

	return true;
}

bool ami_text(int x, int y, const char *text, size_t length,
		const plot_font_style_t *fstyle)
{
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_text()"));
	#endif

	ami_unicode_text(&glob->rp,text,length,fstyle,x,y);
	return true;
}

bool ami_disc(int x, int y, int radius, const plot_style_t *style)
{
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_disc()"));
	#endif

#ifndef NS_AMIGA_CAIRO_ALL
	if (style->fill_type != PLOT_OP_TYPE_NONE) {
		SetRPAttrs(&glob->rp,
			   RPTAG_APenColor,
			   p96EncodeColor(RGBFB_A8B8G8R8, style->fill_colour),
			   TAG_DONE);
		AreaCircle(&glob->rp,x,y,radius);
		AreaEnd(&glob->rp);
	}

	if (style->stroke_type != PLOT_OP_TYPE_NONE) {
		SetRPAttrs(&glob->rp,
			   RPTAG_APenColor,
			   p96EncodeColor(RGBFB_A8B8G8R8, style->stroke_colour),
			   TAG_DONE);

		DrawEllipse(&glob->rp,x,y,radius,radius);
	}
#else
	if (style->fill_type != PLOT_OP_TYPE_NONE) {
		ami_cairo_set_colour(glob->cr, style->fill_colour);
		ami_cairo_set_solid(glob->cr);

		cairo_set_line_width(glob->cr, 0);

		cairo_arc(glob->cr, x, y, radius, 0, M_PI * 2);

		cairo_fill(glob->cr);

		cairo_stroke(glob->cr);
	}

	if (style->stroke_type != PLOT_OP_TYPE_NONE) {
		ami_cairo_set_colour(glob->cr, style->stroke_colour);
		ami_cairo_set_solid(glob->cr);

		cairo_set_line_width(glob->cr, 1);

		cairo_arc(glob->cr, x, y, radius, 0, M_PI * 2);

		cairo_stroke(glob->cr);
	}
#endif
	return true;
}

bool ami_arc(int x, int y, int radius, int angle1, int angle2, const plot_style_t *style)
{
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_arc()"));
	#endif

#ifdef NS_AMIGA_CAIRO
	ami_cairo_set_colour(glob->cr, style->fill_colour);
	ami_cairo_set_solid(glob->cr);

	cairo_set_line_width(glob->cr, 1);
	cairo_arc(glob->cr, x, y, radius,
			(angle1 + 90) * (M_PI / 180),
			(angle2 + 90) * (M_PI / 180));
	cairo_stroke(glob->cr);
#else
/* http://www.crbond.com/primitives.htm
CommonFuncsPPC.lha */

	SetRPAttrs(&glob->rp,
                   RPTAG_APenColor,
                   p96EncodeColor(RGBFB_A8B8G8R8, style->fill_colour),
		   TAG_DONE);

//	DrawArc(&glob->rp,x,y,(float)angle1,(float)angle2,radius);
#endif

	return true;
}

static bool ami_bitmap(int x, int y, int width, int height, struct bitmap *bitmap)
{
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_bitmap()"));
	#endif

	struct BitMap *tbm;

	if(!width || !height) return true;

	if(((x + width) < glob->rect.MinX) ||
		((y + height) < glob->rect.MinY) ||
		(x > glob->rect.MaxX) ||
		(y > glob->rect.MaxY))
		return true;

	tbm = ami_getcachenativebm(bitmap,width,height,glob->rp.BitMap);

	if(!tbm) return true;

	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] ami_bitmap() got native bitmap"));
	#endif

	if(GfxBase->lib_Version >= 53) // AutoDoc says v52, but this function isn't in OS4.0, so checking for v53 (OS4.1)
	{
		uint32 comptype = COMPOSITE_Src;
		if(!bitmap->opaque) 
			comptype = COMPOSITE_Src_Over_Dest;

		CompositeTags(comptype,tbm,glob->rp.BitMap,
					COMPTAG_Flags,COMPFLAG_IgnoreDestAlpha,
					COMPTAG_DestX,glob->rect.MinX,
					COMPTAG_DestY,glob->rect.MinY,
					COMPTAG_DestWidth,glob->rect.MaxX - glob->rect.MinX + 1,
					COMPTAG_DestHeight,glob->rect.MaxY - glob->rect.MinY + 1,
					COMPTAG_SrcWidth,width,
					COMPTAG_SrcHeight,height,
					COMPTAG_OffsetX,x,
					COMPTAG_OffsetY,y,
					TAG_DONE);
	}
	else
	{
		BltBitMapTags(BLITA_Width,width,
						BLITA_Height,height,
						BLITA_Source,tbm,
						BLITA_Dest,&glob->rp,
						BLITA_DestX,x,
						BLITA_DestY,y,
						BLITA_SrcType,BLITT_BITMAP,
						BLITA_DestType,BLITT_RASTPORT,
//						BLITA_Mask,0xFF,
						BLITA_UseSrcAlpha,!bitmap->opaque,
						TAG_DONE);
	}

	if(tbm != bitmap->nativebm)
	{
		p96FreeBitMap(tbm);
	}

	return true;
}

bool ami_bitmap_tile(int x, int y, int width, int height,
			struct bitmap *bitmap, colour bg,
			bitmap_flags_t flags)
{
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_bitmap_tile()"));
	#endif

	int xf,yf,xm,ym,oy,ox;
	struct BitMap *tbm = NULL;
	struct Hook *bfh = NULL;
	struct bfbitmap bfbm;
	bool repeat_x = (flags & BITMAPF_REPEAT_X);
	bool repeat_y = (flags & BITMAPF_REPEAT_Y);

	if(!(repeat_x || repeat_y))
		return ami_bitmap(x, y, width, height, bitmap);

	/* If it is a one pixel transparent image, we are wasting our time */
	if((bitmap->opaque == false) && (bitmap->width == 1) && (bitmap->height == 1))
		return true;

	tbm = ami_getcachenativebm(bitmap,width,height,glob->rp.BitMap);

	if(!tbm) return true;

	ox = x;
	oy = y;

	/* get left most tile position */
	for (; ox > 0; ox -= width)
	;

	/* get top most tile position */
	for (; oy > 0; oy -= height)
	;

	if(ox<0) ox = -ox;
	if(oy<0) oy = -oy;

	if(repeat_x)
	{
		xf = glob->rect.MaxX;
		xm = glob->rect.MinX;
	}
	else
	{
		xf = x + width;
		xm = x;
	}

	if(repeat_y)
	{
		yf = glob->rect.MaxY;
		ym = glob->rect.MinY;
	}
	else
	{
		yf = y + height;
		ym = y;
	}

	if(bitmap->opaque)
	{
		bfh = CreateBackFillHook(BFHA_BitMap,tbm,
							BFHA_Width,width,
							BFHA_Height,height,
							BFHA_OffsetX,ox,
							BFHA_OffsetY,oy,
							TAG_DONE);
	}
	else
	{
		bfbm.bm = tbm;
		bfbm.width = width;
		bfbm.height = height;
		bfbm.offsetx = ox;
		bfbm.offsety = oy;
		bfh = AllocVec(sizeof(struct Hook),MEMF_CLEAR);
		bfh->h_Entry = (HOOKFUNC)ami_bitmap_tile_hook;
		bfh->h_SubEntry = 0;
		bfh->h_Data = &bfbm;
	}

	InstallLayerHook(glob->rp.Layer,bfh);

	EraseRect(&glob->rp,xm,ym,xf,yf);

	InstallLayerHook(glob->rp.Layer,LAYERS_NOBACKFILL);
	if(bitmap->opaque) DeleteBackFillHook(bfh);
		else FreeVec(bfh);

	if(tbm != bitmap->nativebm)
	{
		p96FreeBitMap(tbm);
	}

	return true;
}

static void ami_bitmap_tile_hook(struct Hook *hook,struct RastPort *rp,struct BackFillMessage *bfmsg)
{
	int xf,yf;
	struct bfbitmap *bfbm = (struct bfbitmap *)hook->h_Data;

	/* tile down and across to extents  (bfmsg->Bounds.MinX)*/
	for (xf = -bfbm->offsetx; xf < bfmsg->Bounds.MaxX; xf += bfbm->width) {
		for (yf = -bfbm->offsety; yf < bfmsg->Bounds.MaxY; yf += bfbm->height) {

			if(GfxBase->lib_Version >= 53) // AutoDoc says v52, but this function isn't in OS4.0, so checking for v53 (OS4.1)
			{
				CompositeTags(COMPOSITE_Src_Over_Dest,bfbm->bm,rp->BitMap,
					COMPTAG_Flags,COMPFLAG_IgnoreDestAlpha,
					COMPTAG_DestX,bfmsg->Bounds.MinX,
					COMPTAG_DestY,bfmsg->Bounds.MinY,
					COMPTAG_DestWidth,bfmsg->Bounds.MaxX - bfmsg->Bounds.MinX + 1,
					COMPTAG_DestHeight,bfmsg->Bounds.MaxY - bfmsg->Bounds.MinY + 1,
					COMPTAG_SrcWidth,bfbm->width,
					COMPTAG_SrcHeight,bfbm->height,
					COMPTAG_OffsetX,xf,
					COMPTAG_OffsetY,yf,
					TAG_DONE);
			}
			else
			{
				BltBitMapTags(BLITA_Width,bfbm->width,
					BLITA_Height,bfbm->height,
					BLITA_Source,bfbm->bm,
					BLITA_Dest,rp,
					BLITA_DestX,xf,
					BLITA_DestY,yf,
					BLITA_SrcType,BLITT_BITMAP,
					BLITA_DestType,BLITT_RASTPORT,
					BLITA_UseSrcAlpha,TRUE,
					TAG_DONE);
			}
		}
	}
}

bool ami_group_start(const char *name)
{
	/** optional */
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_group_start()"));
	#endif

	return false;
}

bool ami_group_end(void)
{
	/** optional */
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_group_end()"));
	#endif
	return false;
}

bool ami_flush(void)
{
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_flush()"));
	#endif
	return true;
}

bool ami_path(const float *p, unsigned int n, colour fill, float width,
			colour c, const float transform[6])
{
	#ifdef AMI_PLOTTER_DEBUG
	LOG(("[ami_plotter] Entered ami_path()"));
	#endif

/* For SVG only, because it needs Bezier curves we are going to cheat
   and insist on Cairo */
#ifdef NS_AMIGA_CAIRO
	unsigned int i;
	cairo_matrix_t old_ctm, n_ctm;

	if (n == 0)
		return true;

	if (p[0] != PLOTTER_PATH_MOVE) {
		LOG(("Path does not start with move"));
		return false;
	}

	/* Save CTM */
	cairo_get_matrix(glob->cr, &old_ctm);

	/* Set up line style and width */
	cairo_set_line_width(glob->cr, 1);
	ami_cairo_set_solid(glob->cr);

	/* Load new CTM */
	n_ctm.xx = transform[0];
	n_ctm.yx = transform[1];
	n_ctm.xy = transform[2];
	n_ctm.yy = transform[3];
	n_ctm.x0 = transform[4];
	n_ctm.y0 = transform[5];

	cairo_set_matrix(glob->cr, &n_ctm);

	/* Construct path */
	for (i = 0; i < n; ) {
		if (p[i] == PLOTTER_PATH_MOVE) {
			cairo_move_to(glob->cr, p[i+1], p[i+2]);
			i += 3;
		} else if (p[i] == PLOTTER_PATH_CLOSE) {
			cairo_close_path(glob->cr);
			i++;
		} else if (p[i] == PLOTTER_PATH_LINE) {
			cairo_line_to(glob->cr, p[i+1], p[i+2]);
			i += 3;
		} else if (p[i] == PLOTTER_PATH_BEZIER) {
			cairo_curve_to(glob->cr, p[i+1], p[i+2],
					p[i+3], p[i+4],
					p[i+5], p[i+6]);
			i += 7;
		} else {
			LOG(("bad path command %f", p[i]));
			/* Reset matrix for safety */
			cairo_set_matrix(glob->cr, &old_ctm);
			return false;
		}
	}

	/* Restore original CTM */
	cairo_set_matrix(glob->cr, &old_ctm);

	/* Now draw path */
	if (fill != NS_TRANSPARENT) {
		ami_cairo_set_colour(glob->cr,fill);

		if (c != NS_TRANSPARENT) {
			/* Fill & Stroke */
			cairo_fill_preserve(glob->cr);
			ami_cairo_set_colour(glob->cr,c);
			cairo_stroke(glob->cr);
		} else {
			/* Fill only */
			cairo_fill(glob->cr);
		}
	} else if (c != NS_TRANSPARENT) {
		/* Stroke only */
		ami_cairo_set_colour(glob->cr,c);
		cairo_stroke(glob->cr);
	}
#endif
	return true;
}