svg_base_sa.c

一个用于智能手机的多媒体库适合S60 WinCE的跨平台开发库

/*
 *			GPAC - Multimedia Framework C SDK
 *
 *			Authors: Cyril Concolato - Jean le Feuvre
 *				Copyright (c) 2005-200X ENST
 *					All rights reserved
 *
 *  This file is part of GPAC / SVG Rendering sub-project
 *
 *  GPAC is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *   
 *  GPAC 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 Lesser General Public License for more details.
 *   
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *
 */

#include "visualsurface2d.h"

#ifndef GPAC_DISABLE_SVG
#include "svg_stacks.h"


#ifdef GPAC_ENABLE_SVG_SA


void svg_sa_apply_local_transformation(RenderEffect2D *eff, GF_Node *node, GF_Matrix2D *backup_matrix)
{
	SVGTransformableElement *tr = (SVGTransformableElement *)node;
	gf_mx2d_copy(*backup_matrix, eff->transform);

	if (tr->transform.is_ref) 
		gf_mx2d_copy(eff->transform, eff->vb_transform);

	if (tr->motionTransform) 
		gf_mx2d_pre_multiply(&eff->transform, tr->motionTransform);

	gf_mx2d_pre_multiply(&eff->transform, &tr->transform.mat);
}

void svg_sa_restore_parent_transformation(RenderEffect2D *eff, GF_Matrix2D *backup_matrix)
{
	gf_mx2d_copy(eff->transform, *backup_matrix);  
}



/* Set the viewport of the renderer based on the element that contains a viewport 
   TODO: change the SVG_SA_svgElement into an element that has a viewport (more generic)
*/
static void svg_sa_set_viewport_transformation(RenderEffect2D *eff, SVG_SA_svgElement *svg, Bool is_root) 
{
	GF_Matrix2D mat;
	Fixed real_width, real_height;

	gf_mx2d_init(mat);

	if (is_root) {
		u32 scene_width = eff->surface->render->compositor->scene_width;
		u32 scene_height = eff->surface->render->compositor->scene_height;
		u32 dpi = 90; /* Should retrieve the dpi from the system */

		switch (svg->width.type) {
		case SVG_NUMBER_VALUE:
		case SVG_NUMBER_PX:
			real_width = INT2FIX(scene_width);
			break;
		case SVG_NUMBER_PERCENTAGE:
			/*u32 * fixed / u32*/
			real_width = scene_width*svg->width.value/100;
			break;
		case SVG_NUMBER_IN:
			real_width = dpi * svg->width.value;
			break;
		case SVG_NUMBER_CM:
			real_width = gf_mulfix(dpi*FLT2FIX(0.39), svg->width.value);
			break;
		case SVG_NUMBER_MM:
			real_width = gf_mulfix(dpi*FLT2FIX(0.039), svg->width.value);
			break;
		case SVG_NUMBER_PT:
			real_width = dpi/12 * svg->width.value;
			break;
		case SVG_NUMBER_PC:
			real_width = dpi/6 * svg->width.value;
			break;
		default:
			real_width = INT2FIX(scene_width);
			break;
		}

		switch (svg->height.type) {
		case SVG_NUMBER_VALUE:
		case SVG_NUMBER_PX:
			real_height = INT2FIX(scene_height);
			break;
		case SVG_NUMBER_PERCENTAGE:
			real_height = scene_height*svg->height.value/100;
			break;
		case SVG_NUMBER_IN:
			real_height = dpi * svg->height.value;
			break;
		case SVG_NUMBER_CM:
			real_height = gf_mulfix(dpi*FLT2FIX(0.39), svg->height.value);
			break;
		case SVG_NUMBER_MM:
			real_height = gf_mulfix(dpi*FLT2FIX(0.039), svg->height.value);
			break;
		case SVG_NUMBER_PT:
			real_height = dpi/12 * svg->height.value;
			break;
		case SVG_NUMBER_PC:
			real_height = dpi/6 * svg->height.value;
			break;
		default:
			real_height = INT2FIX(scene_height);
			break;
		}
	} else {
		real_width = real_height = 0;
		switch (svg->width.type) {
		case SVG_NUMBER_VALUE:
		case SVG_NUMBER_PX:
			real_width = svg->width.value;
			break;
		default:
			break;
		}
		switch (svg->height.type) {
		case SVG_NUMBER_VALUE:
		case SVG_NUMBER_PX:
			real_height = svg->height.value;
			break;
		default:
			break;
		}
	}
	
	if (!real_width || !real_height) return;


	if (svg->viewBox.is_set && svg->viewBox.width != 0 && svg->viewBox.height != 0) {
		Fixed scale, vp_w, vp_h;
		if (svg->preserveAspectRatio.meetOrSlice==SVG_MEETORSLICE_MEET) {
			if (gf_divfix(real_width, svg->viewBox.width) > gf_divfix(real_height, svg->viewBox.height)) {
				scale = gf_divfix(real_height, svg->viewBox.height);
				vp_w = gf_mulfix(svg->viewBox.width, scale);
				vp_h = real_height;
			} else {
				scale = gf_divfix(real_width, svg->viewBox.width);
				vp_w = real_width;
				vp_h = gf_mulfix(svg->viewBox.height, scale);
			}
		} else {
			if (gf_divfix(real_width, svg->viewBox.width) < gf_divfix(real_height, svg->viewBox.height)) {
				scale = gf_divfix(real_height, svg->viewBox.height);
				vp_w = gf_mulfix(svg->viewBox.width, scale);
				vp_h = real_height;
			} else {
				scale = gf_divfix(real_width, svg->viewBox.width);
				vp_w = real_width;
				vp_h = gf_mulfix(svg->viewBox.height, scale);
			}
		}
		if (svg->preserveAspectRatio.align==SVG_PRESERVEASPECTRATIO_NONE) {
			mat.m[0] = gf_divfix(real_width, svg->viewBox.width);
			mat.m[4] = gf_divfix(real_height, svg->viewBox.height);
			mat.m[2] = - gf_muldiv(svg->viewBox.x, real_width, svg->viewBox.width); 
			mat.m[5] = - gf_muldiv(svg->viewBox.y, real_height, svg->viewBox.height); 
		} else {
			Fixed dx, dy;
			mat.m[0] = mat.m[4] = scale;
			mat.m[2] = - gf_mulfix(svg->viewBox.x, scale); 
			mat.m[5] = - gf_mulfix(svg->viewBox.y, scale); 

			dx = dy = 0;
			switch (svg->preserveAspectRatio.align) {
			case SVG_PRESERVEASPECTRATIO_XMINYMIN:
				break;
			case SVG_PRESERVEASPECTRATIO_XMIDYMIN:
				dx = ( real_width - vp_w) / 2; 
				break;
			case SVG_PRESERVEASPECTRATIO_XMAXYMIN:
				dx = real_width - vp_w; 
				break;
			case SVG_PRESERVEASPECTRATIO_XMINYMID:
				dy = ( real_height - vp_h) / 2; 
				break;
			case SVG_PRESERVEASPECTRATIO_XMIDYMID:
				dx = ( real_width  - vp_w) / 2; 
				dy = ( real_height - vp_h) / 2; 
				break;
			case SVG_PRESERVEASPECTRATIO_XMAXYMID:
				dx = real_width  - vp_w; 
				dy = ( real_height - vp_h) / 2; 
				break;
			case SVG_PRESERVEASPECTRATIO_XMINYMAX:
				dy = real_height - vp_h; 
				break;
			case SVG_PRESERVEASPECTRATIO_XMIDYMAX:
				dx = (real_width - vp_w) / 2; 
				dy = real_height - vp_h; 
				break;
			case SVG_PRESERVEASPECTRATIO_XMAXYMAX:
				dx = real_width  - vp_w; 
				dy = real_height - vp_h; 
				break;
			}
			mat.m[2] += dx;
			mat.m[5] += dy;
			/*we need a clipper*/
			if (svg->preserveAspectRatio.meetOrSlice==SVG_MEETORSLICE_SLICE) {
				GF_Rect rc;
				rc.width = real_width;
				rc.height = real_height;
				if (!is_root) {
					rc.x = 0;
					rc.y = real_height;
					gf_mx2d_apply_rect(&eff->vb_transform, &rc);
				} else {
					rc.x = dx;
					rc.y = dy + real_height;
				}
				eff->surface->top_clipper = gf_rect_pixelize(&rc);
			}
		}
	}
	gf_mx2d_pre_multiply(&eff->vb_transform, &mat);
}

/* Node specific rendering functions
   All the nodes follow the same principles:
	* Check if the display property is not set to none, otherwise do not render
	* Back-up of the renderer properties and apply the current ones
	* Back-up of the coordinate system & apply geometric transformation if any
	* Render the children if any or the shape if leaf node
	* Restore coordinate system
	* Restore styling properties
 */
static void SVG_Render_svg(GF_Node *node, void *rs, Bool is_destroy)
{
	u32 viewport_color;
	GF_Matrix2D backup_matrix;
	GF_IRect top_clip;
	Bool is_root_svg = 0;
	SVGPropertiesPointers backup_props;
	u32 backup_flags;
	u32 styling_size = sizeof(SVGPropertiesPointers);
	SVG_SA_svgElement *svg = (SVG_SA_svgElement *)node;
	RenderEffect2D *eff = (RenderEffect2D *) rs;

	if (is_destroy) {
		SVGPropertiesPointers *svgp = (SVGPropertiesPointers *) gf_node_get_private(node);
		if (svgp) {
			gf_svg_properties_reset_pointers(svgp);
			free(svgp);
		}
		return;
	}

	/*enable or disable navigation*/
	eff->surface->render->navigation_disabled = (svg->zoomAndPan == SVG_ZOOMANDPAN_DISABLE) ? 1 : 0;

	if (!eff->svg_props) {
		eff->svg_props = (SVGPropertiesPointers *) gf_node_get_private(node);
		is_root_svg = 1;
	}

	svg_sa_render_base(node, eff, &backup_props, &backup_flags);

	if (svg_is_display_off(eff->svg_props)) {
		memcpy(eff->svg_props, &backup_props, styling_size);
		eff->svg_flags = backup_flags;
		return;
	}

	top_clip = eff->surface->top_clipper;
	gf_mx2d_copy(backup_matrix, eff->transform);
	gf_mx2d_init(eff->vb_transform);
	svg_sa_set_viewport_transformation(eff, svg, is_root_svg);
	gf_mx2d_pre_multiply(&eff->transform, &eff->vb_transform);

	if (!is_root_svg && (svg->x.value || svg->y.value)) 
		gf_mx2d_add_translation(&eff->transform, svg->x.value, svg->y.value);

	/* TODO: FIX ME: this only works for single SVG element in the doc*/
	if (is_root_svg && eff->svg_props->viewport_fill->type != SVG_PAINT_NONE) {
		viewport_color = GF_COL_ARGB_FIXED(eff->svg_props->viewport_fill_opacity->value, eff->svg_props->viewport_fill->color.red, eff->svg_props->viewport_fill->color.green, eff->svg_props->viewport_fill->color.blue);
		if (eff->surface->render->compositor->back_color != viewport_color) {
			eff->invalidate_all = 1;
			eff->surface->render->compositor->back_color = viewport_color;
		}
	}
	if (eff->traversing_mode == TRAVERSE_GET_BOUNDS) {
		svg_get_nodes_bounds(node, svg->children, eff);
	} else {
		svg_render_node_list(svg->children, eff);
	}

	svg_sa_restore_parent_transformation(eff, &backup_matrix);
	memcpy(eff->svg_props, &backup_props, styling_size);
	eff->svg_flags = backup_flags;
	eff->surface->top_clipper = top_clip;
}

void svg_sa_init_svg(Render2D *sr, GF_Node *node)
{
	SVGPropertiesPointers *svgp;

	GF_SAFEALLOC(svgp, SVGPropertiesPointers);
	gf_svg_properties_init_pointers(svgp);
	gf_node_set_private(node, svgp);

	gf_node_set_callback_function(node, SVG_Render_svg);
}

#undef ENABLE_CULLING

#ifdef ENABLE_CULLING
static GFINLINE Bool rect_over_cliper(GF_Rect *r, GF_IRect *cliper)
{
	if (cliper->x+cliper->width<=r->x) return 0;
	if (cliper->x>=r->x+r->width) return 0;
	if (cliper->y-cliper->height>=r->y) return 0;
	if (cliper->y<=r->y-r->height) return 0;
	return 1;
}

/*@rc2 fully contained in @rc1*/
static GFINLINE Bool rect_inside_cliper(GF_IRect *cliper, GF_Rect *r) 
{
	if ( (cliper->x <= r->x) 
		&& (cliper->y >= r->y) 
		&& (cliper->x + cliper->width >= r->x + r->width) 
		&& (cliper->y - cliper->height <= r->y - r->height) )
		return 1;
	return 0;
}
#endif

static void SVG_Render_g(GF_Node *node, void *rs, Bool is_destroy)
{
	GF_Matrix2D backup_matrix;
	SVGPropertiesPointers backup_props;
	u32 backup_flags;
	u32 styling_size = sizeof(SVGPropertiesPointers);
	SVG_SA_gElement *g = (SVG_SA_gElement *)node;
	RenderEffect2D *eff = (RenderEffect2D *) rs;
#ifdef ENABLE_CULLING	
	GF_Rect *bounds	= gf_node_get_private(node);
#endif
	if (is_destroy) {
#ifdef ENABLE_CULLING
		free(bounds);
#endif
		return;
	}

	svg_sa_render_base(node, eff, &backup_props, &backup_flags);

	if (svg_is_display_off(eff->svg_props)) {
		u32 prev_flags = eff->trav_flags;
		eff->trav_flags |= GF_SR_TRAV_SWITCHED_OFF;
		svg_render_node_list(g->children, eff);
		eff->trav_flags = prev_flags;

		memcpy(eff->svg_props, &backup_props, styling_size);
		eff->svg_flags = backup_flags;
		return;
	}	
#ifdef ENABLE_CULLING
	if (gf_node_dirty_get(node) & GF_SG_CHILD_DIRTY) {
		u32 prev_mode = eff->traversing_mode;
		eff->traversing_mode = TRAVERSE_GET_BOUNDS;

		svg_get_nodes_bounds(node, g->children, eff);
		*bounds = eff->bounds;

		gf_node_dirty_clear(node, GF_SG_CHILD_DIRTY);
		eff->traversing_mode = prev_mode;
	}
#endif
	svg_sa_apply_local_transformation(eff, node, &backup_matrix);
	if (eff->traversing_mode == TRAVERSE_GET_BOUNDS) {
		svg_get_nodes_bounds(node, g->children, eff);
	} else {
#ifdef ENABLE_CULLING
		if (bounds->width && bounds->height) {
			if (eff->inside_cliper) {
				svg_render_node_list(g->children, eff);
			} else {
				GF_Rect rc = *bounds;
				gf_mx2d_apply_rect(&eff->transform, &rc);
				if (rect_inside_cliper(&eff->surface->top_clipper, &rc)) {
					eff->inside_cliper = 1;
					svg_render_node_list(g->children, eff);
				} else if (rect_over_cliper(&rc, &eff->surface->top_clipper)) {
					svg_render_node_list(g->children, eff);
				}
				eff->inside_cliper = 0;
			}
		}
#else
		svg_render_node_list(g->children, eff);
#endif
	}
	svg_sa_restore_parent_transformation(eff, &backup_matrix);
	memcpy(eff->svg_props, &backup_props, styling_size);
	eff->svg_flags = backup_flags;
}


void svg_sa_init_g(Render2D *sr, GF_Node *node)
{
#ifdef ENABLE_CULLING
	GF_Rect *bounds;
	GF_SAFEALLOC(bounds, GF_Rect);
	gf_node_set_private(node, bounds);
#endif
	gf_node_set_callback_function(node, SVG_Render_g);
}

static Bool eval_conditional(GF_Renderer *sr, SVG_SA_Element *elt)
{
	u32 i, count;
	Bool found;
	const char *lang_3cc, *lang_2cc;
	if (!elt->conditional) return 1;

	count = gf_list_count(elt->conditional->requiredFeatures);
	for (i=0;i<count;i++) {
		XMLRI *iri = (XMLRI *)gf_list_get(elt->conditional->requiredFeatures, i);
		if (!iri->string) continue;
		/*TODO FIXME: be a bit more precise :)*/
		if (!strnicmp(iri->string, "http://www.w3.org/", 18)) {
			char *feat = strrchr(iri->string, '#');
			if (!feat) continue;
			feat++;
			if (!strcmp(feat, "SVGDOM")) return 0;
			if (!strcmp(feat, "Font")) return 0;
			continue;
		}
		return 0;
	}
	count = gf_list_count(elt->conditional->requiredExtensions);
	if (count) return 0;

	lang_3cc = gf_cfg_get_key(sr->user->config, "Systems", "Language3CC");
	if (!lang_3cc) lang_3cc = "und";
	lang_2cc = gf_cfg_get_key(sr->user->config, "Systems", "Language2CC");
	if (!lang_2cc) lang_2cc = "un";

	count = gf_list_count(elt->conditional->systemLanguage);