netsurf/riscos/save_draw.c

/*
 * This file is part of NetSurf, http://netsurf.sourceforge.net/
 * Licensed under the GNU General Public License,
 *                http://www.opensource.org/licenses/gpl-license
 * Copyright 2004 John M Bell <jmb202@ecs.soton.ac.uk>
 */

#include <math.h>
#include <stdbool.h>
#include <string.h>

#include "oslib/drawfile.h"
#include "oslib/jpeg.h"
#include "oslib/osfile.h"

#include "netsurf/utils/config.h"
#include "netsurf/content/content.h"
#include "netsurf/css/css.h"
#include "netsurf/render/form.h"
#include "netsurf/render/layout.h"
#include "netsurf/riscos/save_draw.h"
#include "netsurf/utils/log.h"
#include "netsurf/utils/utils.h"

#ifdef WITH_DRAW_EXPORT

/* in browser units = OS/2 = draw/512 */
#define A4PAGEWIDTH (744)
#define A4PAGEHEIGHT (1052)
static unsigned long length;
static drawfile_diagram *d;

static void add_font_table(struct content *content);
static void add_options(void);
static void add_objects(struct content *content, struct box *box,
                        unsigned long cbc, long x, long y);
static void add_graphic(struct content *content, struct box *box,
                        unsigned long cbc, long x, long y);
static void add_rect(struct content *content, struct box *box,
                        unsigned long cbc, long x, long y, bool bg);
static void add_line(struct content *content, struct box *box,
                        unsigned long cbc, long x, long y);
static void add_circle(struct content *content, struct box *box,
                        unsigned long cbc, long x, long y);

void save_as_draw(struct content *c, char *path)
{
	struct box *box;
	int temp;
	unsigned long bc;

	if (c->type != CONTENT_HTML) {
	        return;
	}

	box = c->data.html.layout->children;
	temp = c->width;
        bc = 0xffffff;

	d = xcalloc(40, sizeof(char));

        length = 40;

        memcpy((char*)&d->tag, "Draw", 4);
	d->major_version = 201;
	d->minor_version = 0;
	memcpy((char*)&d->source, "NetSurf     ", 12);

	/* recalculate box widths for an A4 page */
	layout_document(box, A4PAGEWIDTH);

	d->bbox.x0 = 0;
	d->bbox.y0 = 0;
	d->bbox.x1 = A4PAGEWIDTH*512;
	d->bbox.y1 = A4PAGEHEIGHT*512;

	add_font_table(c);

	add_options();

	if (c->data.html.background_colour != TRANSPARENT) {
		bc = c->data.html.background_colour;
		add_rect(c, box, bc<<8, 0, A4PAGEHEIGHT*512, true);
	}

	/* right, traverse the tree and grab the contents */
	add_objects(c, box, bc, 0, A4PAGEHEIGHT*512);

	xosfile_save_stamped(path, 0xaff, (byte*)d, (byte*)d+length);

	xfree(d);

        /* reset layout to current window width */
	layout_document(box, temp);
}

/**
 * add font table
 */
void add_font_table(struct content *content) {

        drawfile_object *dro;
        drawfile_font_table *ft = xcalloc(0, sizeof(char));
        drawfile_font_def *fd = xcalloc(0, sizeof(char));
        int handle = 0, ftlen=0;
        const char *name;

        do {
          name = enumerate_fonts(content->data.html.fonts, &handle);

          if (handle == -1 && name == 0)
                  break;

          /* at this point, handle is always (font_table entry + 1) */
          fd = xrealloc(fd, 1+strlen(name)+1);
          memset(fd, 0, 1+strlen(name)+1);
          fd->font_index = handle;
          memcpy((char*)&fd->font_name, name, strlen(name));

          ft = xrealloc(ft, ftlen+1+strlen(name)+1);
          memcpy((char*)ft+ftlen, fd, 1+strlen(name)+1);

          ftlen += 1+strlen(name)+1;

        } while (handle != -1);

        /* word align end of list */
        if (((ftlen+3)/4*4) != 0) {
          ft = xrealloc(ft, (unsigned)(ftlen+3)/4*4);
          ftlen = (ftlen+3)/4*4;
        }

        dro = xcalloc((unsigned)8+ftlen, sizeof(char));

	dro->type = drawfile_TYPE_FONT_TABLE;
	dro->size = 8+ftlen;
	memcpy((char*)&dro->data.font_table, ft, (unsigned)ftlen);

        d = xrealloc(d, (unsigned)length+dro->size);

        memcpy((char*)&d->objects, dro, (unsigned)dro->size);

	length += 8+ftlen;

        xfree(fd);
	xfree(ft);
	xfree(dro);
}

/**
 * add options object
 */
void add_options() {

        drawfile_object *dro = xcalloc(8+80, sizeof(char));
        drawfile_options *dfo = xcalloc(80, sizeof(char));

        dfo->bbox.x0 = dfo->bbox.y0 = dfo->bbox.x1 = dfo->bbox.y1 = 0;
        dfo->paper_size = 0x500; /* A4 */
        dfo->paper_options = (drawfile_paper_options)0;
        dfo->grid_spacing = 1;
        dfo->grid_division = 2;
        dfo->isometric = false;
        dfo->auto_adjust = false;
        dfo->show = false;
        dfo->lock = false;
        dfo->cm = true;
        dfo->zoom_mul = 1;
        dfo->zoom_div = 1;
        dfo->zoom_lock = false;
        dfo->toolbox = true;
        dfo->entry_mode = drawfile_ENTRY_MODE_SELECT;
        dfo->undo_size = 5000;

        dro->type = drawfile_TYPE_OPTIONS;
        dro->size = 8+80;
        memcpy((char*)&dro->data.options, dfo,(unsigned)dro->size-8);

        d = xrealloc(d, length+dro->size);
        memcpy((char*)d+length, dro, (unsigned)dro->size);

        length += dro->size;

        xfree(dfo);
        xfree(dro);
}

/**
 * Traverses box tree, adding objects to the diagram as it goes.
 */
void add_objects(struct content *content, struct box *box,
                 unsigned long cbc, long x, long y) {

	struct box *c;
	int width, height, colour;

	x += box->x * 512;
	y -= box->y * 512;
	width = (box->padding[LEFT] + box->width + box->padding[RIGHT]) * 2;
	height = (box->padding[TOP] + box->height + box->padding[BOTTOM]) * 2;

	if (box->style->visibility == CSS_VISIBILITY_HIDDEN) {
		for (c = box->children; c; c = c->next)
			add_objects(content, c, cbc, x, y);
		return;
	}

	if (box->style != 0 && box->style->background_color != TRANSPARENT) {
		cbc = box->style->background_color;
		add_rect(content, box, cbc<<8, x, y, false);
	}

	if (box->object) {
	        if (box->object->type == CONTENT_PLUGIN    ||
	            box->object->type == CONTENT_OTHER     ||
	            box->object->type == CONTENT_UNKNOWN   ||
	            box->object->type == CONTENT_HTML      ||
	            box->object->type == CONTENT_TEXTPLAIN ||
	            box->object->type == CONTENT_CSS       ||
	            box->object->type == CONTENT_DRAW) {
		        return; /* don't handle these */
		}
		else {
		        add_graphic(box->object, box, cbc, x, y);
		        return;
		}
	}
	else if (box->gadget && (box->gadget->type == GADGET_CHECKBOX ||
		 box->gadget->type == GADGET_RADIO)) {
		if (box->gadget->type == GADGET_CHECKBOX) {
		        add_rect(content, box, 0xDEDEDE00, x, y, false);
		}
		else {
		        add_circle(content, box, 0xDEDEDE00, x, y);
		}
		return;
	}
	else if (box->text && box->font) {

	        if (box->length == 0) {
	                return;
	        }

	        /* text-decoration */
		colour = box->style->color;
		colour = ((((colour >> 16) + (cbc >> 16)) / 2) << 16)
			| (((((colour >> 8) & 0xff) +
			     ((cbc >> 8) & 0xff)) / 2) << 8)
			| ((((colour & 0xff) + (cbc & 0xff)) / 2) << 0);
		if (box->style->text_decoration & CSS_TEXT_DECORATION_UNDERLINE || (box->parent->parent->style->text_decoration & CSS_TEXT_DECORATION_UNDERLINE && box->parent->parent->type == BOX_BLOCK)) {
		        add_line(content, box, (unsigned)colour<<8, x, (int)(y+(box->height*0.1*512)));
		}
                if (box->style->text_decoration & CSS_TEXT_DECORATION_OVERLINE || (box->parent->parent->style->text_decoration & CSS_TEXT_DECORATION_OVERLINE && box->parent->parent->type == BOX_BLOCK)) {
		        add_line(content, box, (unsigned)colour<<8, x, (int)(y+(box->height*0.9*512)));
		}
		if (box->style->text_decoration & CSS_TEXT_DECORATION_LINE_THROUGH || (box->parent->parent->style->text_decoration & CSS_TEXT_DECORATION_LINE_THROUGH && box->parent->parent->type == BOX_BLOCK)) {
		        add_line(content, box, (unsigned)colour<<8, x, (int)(y+(box->height*0.4*512)));
		}

		/* normal text */
		{
			drawfile_object *dro = xcalloc(8+44+((box->length+1+3)/4*4), sizeof(char));
			drawfile_text *dt = xcalloc(44+((box->length+1+3)/4*4), sizeof(char));

			dt->bbox.x0 = x;
			dt->bbox.y0 = y-(box->height*1.5*512);
			dt->bbox.x1 = x+(box->width*512);
			dt->bbox.y1 = y;
			dt->fill = box->style->color<<8;
			dt->bg_hint = cbc<<8;
			dt->style.font_index = box->font->id+1;
			dt->xsize = box->font->size*40;
			dt->ysize = box->font->size*40;
			dt->base.x = x;
			dt->base.y = y-(box->height*512)+1536;
			memcpy(dt->text, box->text, box->length);

			dro->type = drawfile_TYPE_TEXT;
			dro->size = ((box->length+1+3)/4*4) + 44 + 8;
			memcpy((char*)&dro->data.text, dt, (unsigned)dro->size-8);
			d = xrealloc(d, (unsigned)length + dro->size);
			memcpy((char*)d+length, dro, (unsigned)dro->size);
			length += dro->size;

			xfree(dt);
			xfree(dro);
			return;
		}
	}
	else {
		for (c = box->children; c != 0; c = c->next) {
		        if (c->type != BOX_FLOAT_LEFT && c->type != BOX_FLOAT_RIGHT)
			        add_objects(content, c, cbc, x, y);
		}
		for (c = box->float_children; c !=  0; c = c->next_float) {
			add_objects(content, c, cbc, x, y);
		}
	}
}

/**
 * Add images to the drawfile. Uses add_jpeg as a helper.
 */
void add_graphic(struct content *content, struct box *box,
                        unsigned long cbc, long x, long y) {

        drawfile_object *dro;
        drawfile_sprite *ds;
        long sprite_length = 0;

        /* cast-tastic... */
        switch (content->type) {
          case CONTENT_JPEG:
               sprite_length = ((osspriteop_header*)((char*)content->data.jpeg.sprite_area+content->data.jpeg.sprite_area->first))->size;
               break;
          case CONTENT_PNG:
               sprite_length = ((osspriteop_header*)((char*)content->data.png.sprite_area+content->data.png.sprite_area->first))->size;
               break;
          case CONTENT_GIF:
               sprite_length = content->data.gif.gif->frame_image->size;
               break;
          case CONTENT_SPRITE:
               sprite_length = ((osspriteop_header*)((char*)content->data.sprite.data+(((osspriteop_area*)content->data.sprite.data)->first)))->size;
               break;
          default:
               break;
        }

        dro = xcalloc((unsigned)8 + 16 + sprite_length, sizeof(char));
        ds = xcalloc((unsigned)16 + sprite_length, sizeof(char));

        ds->bbox.x0 = x;
        ds->bbox.y0 = y-((box->padding[TOP] + box->height + box->padding[BOTTOM])*512);
        ds->bbox.x1 = x+((box->padding[LEFT] + box->width + box->padding[RIGHT])*512);

        ds->bbox.y1 = y;

        switch (content->type) {
          case CONTENT_JPEG:
               memcpy((char*)ds+16, (char*)content->data.jpeg.sprite_area+content->data.jpeg.sprite_area->first,
                       (unsigned)sprite_length);
               break;
          case CONTENT_PNG:
               memcpy((char*)ds+16, (char*)content->data.png.sprite_area+content->data.png.sprite_area->first,
                       (unsigned)sprite_length);
               break;
          case CONTENT_GIF:
               memcpy((char*)ds+16, (char*)content->data.gif.gif->frame_image,
                       (unsigned)sprite_length);
               break;
          case CONTENT_SPRITE:
               memcpy((char*)ds+16, (char*)content->data.sprite.data+((osspriteop_area*)content->data.sprite.data)->first,
                       (unsigned)sprite_length);
               break;
          default:
               break;
        }

        dro->type = drawfile_TYPE_SPRITE;
        dro->size = 8 + 16 + sprite_length;
        memcpy((char*)&dro->data.sprite, ds, (unsigned)16 + sprite_length);

        d = xrealloc(d, length+dro->size);
        memcpy((char*)d+length, dro, (unsigned)dro->size);

        length += dro->size;

        xfree(ds);
        xfree(dro);
}


/**
 * Add a filled, borderless rectangle to the diagram
 * Set bg to true to produce the background rectangle.
 */
void add_rect(struct content *content, struct box *box,
              unsigned long cbc, long x, long y, bool bg) {

        drawfile_object *dro = xcalloc(8+96, sizeof(char));
        drawfile_path *dp = xcalloc(96, sizeof(char));
        draw_path_element *dpe = xcalloc(12, sizeof(char));

        if (bg) {
                dp->bbox.x0 = 0;
                dp->bbox.y0 = 0;
                dp->bbox.x1 = A4PAGEWIDTH*512;
                dp->bbox.y1 = A4PAGEHEIGHT*512;
        }
        else {
                dp->bbox.x0 = x;
                dp->bbox.y0 = y-((box->padding[TOP] + box->height + box->padding[BOTTOM])*512);
                dp->bbox.x1 = x+((box->padding[LEFT] + box->width + box->padding[RIGHT])*512);
                dp->bbox.y1 = y;
        }

        dp->fill = cbc;
        dp->outline = cbc;
        dp->width = 0;
        dp->style.flags = 0;

        /**
         *     X<------X
         *     |       ^
         *     |       |
         *     v       |
         *  -->X------>X
         */

        /* bottom left */
        dpe->tag = draw_MOVE_TO;
        dpe->data.move_to.x = dp->bbox.x0;
        dpe->data.move_to.y = dp->bbox.y0;
        memcpy((char*)&dp->path, dpe, 12);
        /* bottom right */
        dpe->tag = draw_LINE_TO;
        dpe->data.line_to.x = dp->bbox.x1;
        dpe->data.line_to.y = dp->bbox.y0;
        memcpy((char*)&dp->path+12, dpe, 12);
        /* top right */
        dpe->tag = draw_LINE_TO;
        dpe->data.line_to.x = dp->bbox.x1;
        dpe->data.line_to.y = dp->bbox.y1;
        memcpy((char*)&dp->path+24, dpe, 12);
        /* top left */
        dpe->tag = draw_LINE_TO;
        dpe->data.line_to.x = dp->bbox.x0;
        dpe->data.line_to.y = dp->bbox.y1;
        memcpy((char*)&dp->path+36, dpe, 12);
        /* bottom left */
        dpe->tag = draw_LINE_TO;
        dpe->data.line_to.x = dp->bbox.x0;
        dpe->data.line_to.y = dp->bbox.y0;
        memcpy((char*)&dp->path+48, dpe, 12);
        /* end */
        dpe->tag = draw_END_PATH;
        memcpy((char*)&dp->path+60, dpe, 4);

        dro->type = drawfile_TYPE_PATH;
        dro->size = 8+96;
        memcpy((char*)&dro->data.path, dp, (unsigned)dro->size-8);

        d = xrealloc(d, length+dro->size);
        memcpy((char*)d+length, dro, (unsigned)dro->size);

        length += dro->size;

        xfree(dpe);
        xfree(dp);
        xfree(dro);
}

/**
 * add a line to the diagram
 */
void add_line(struct content *content, struct box *box,
              unsigned long cbc, long x, long y) {

        drawfile_object *dro = xcalloc(8+60, sizeof(char));
        drawfile_path *dp = xcalloc(60, sizeof(char));
        draw_path_element *dpe = xcalloc(12, sizeof(char));

        dp->bbox.x0 = x;
        dp->bbox.y0 = y-((box->padding[TOP] + box->height + box->padding[BOTTOM])*512);
        dp->bbox.x1 = x+((box->padding[LEFT] + box->width + box->padding[RIGHT])*512);
        dp->bbox.y1 = y;

        dp->fill = cbc;
        dp->outline = cbc;
        dp->width = 0;
        dp->style.flags = 0;

        /* left end */
        dpe->tag = draw_MOVE_TO;
        dpe->data.move_to.x = dp->bbox.x0;
        dpe->data.move_to.y = dp->bbox.y0;
        memcpy((char*)&dp->path, dpe, 12);
        /* right end */
        dpe->tag = draw_LINE_TO;
        dpe->data.line_to.x = dp->bbox.x1;
        dpe->data.line_to.y = dp->bbox.y0;
        memcpy((char*)&dp->path+12, dpe, 12);
        /* end */
        dpe->tag = draw_END_PATH;
        memcpy((char*)&dp->path+24, dpe, 4);

        dro->type = drawfile_TYPE_PATH;
        dro->size = 8+60;
        memcpy((char*)&dro->data.path, dp, (unsigned)dro->size-8);

        d = xrealloc(d, length+dro->size);
        memcpy((char*)d+length, dro, (unsigned)dro->size);

        length += dro->size;

        xfree(dpe);
        xfree(dp);
        xfree(dro);
}

/**
 * add a circle to the diagram.
 */
void add_circle(struct content *content, struct box *box,
                        unsigned long cbc, long x, long y) {

        drawfile_object *dro = xcalloc(8+160, sizeof(char));
        drawfile_path *dp = xcalloc(160, sizeof(char));
        draw_path_element *dpe = xcalloc(28, sizeof(char));

        double radius = 0, kappa;
        double cx, cy;

        dp->bbox.x0 = x;
        dp->bbox.y0 = y-((box->padding[TOP] + box->height + box->padding[BOTTOM])*512);
        dp->bbox.x1 = x+((box->padding[LEFT] + box->width + box->padding[RIGHT])*512);
        dp->bbox.y1 = y;

        cx = ((dp->bbox.x1-dp->bbox.x0)/2.0);
        cy = ((dp->bbox.y1-dp->bbox.y0)/2.0);
        if (cx == cy) {
                radius = cx; /* box is square */
        }
        else if (cx > cy) {
                radius = cy;
                dp->bbox.x1 -= (cx-cy); /* reduce box width */
        }
        else if (cy > cx) {
                radius = cx;
                dp->bbox.y0 += (cy-cx); /* reduce box height */
        }
        kappa = radius * ((4.0/3.0)*(sqrt(2.0)-1.0)); /* ~= 0.5522847498 */

        dp->fill = cbc;
        dp->outline = cbc;
        dp->width = 0;
        dp->style.flags = drawfile_PATH_ROUND;

        /*
         *    Z   b   Y
         *
         *    a   X   c
         *
         *    V   d   W
         *
         *    V = (x0,y0)
         *    W = (x1,y0)
         *    Y = (x1,y1)
         *    Z = (x0,y1)
         *
         *    X = centre of circle (x0+cx, y0+cx)
         *
         *    The points a,b,c,d are where the circle intersects
         *    the bounding box. at these points, the bounding box is
         *    tangental to the circle.
         */

        /* start at a */
        dpe->tag = draw_MOVE_TO;
        dpe->data.move_to.x = (dp->bbox.x0+cx)-radius;
        dpe->data.move_to.y = (dp->bbox.y0+cy);
        memcpy((char*)&dp->path, dpe, 12);

        /* point1->point2 : (point1)(ctrl1)(ctrl2)(point2) */

        /* a->b : (x-r, y)(x-r, y+k)(x-k, y+r)(x, y+r) */
        dpe->tag = draw_BEZIER_TO;
        dpe->data.bezier_to[0].x = (dp->bbox.x0+cx)-radius;
        dpe->data.bezier_to[0].y = (dp->bbox.y0+cy)+kappa;
        dpe->data.bezier_to[1].x = (dp->bbox.x0+cx)-kappa;
        dpe->data.bezier_to[1].y = (dp->bbox.y0+cy)+radius;
        dpe->data.bezier_to[2].x = (dp->bbox.x0+cx);
        dpe->data.bezier_to[2].y = (dp->bbox.y0+cy)+radius;
        memcpy((char*)&dp->path+12, dpe, 28);

        /* b->c : (x, y+r)(x+k, y+r)(x+r, y+k)(x+r, y)*/
        dpe->tag = draw_BEZIER_TO;
        dpe->data.bezier_to[0].x = (dp->bbox.x0+cx)+kappa;
        dpe->data.bezier_to[0].y = (dp->bbox.y0+cy)+radius;
        dpe->data.bezier_to[1].x = (dp->bbox.x0+cx)+radius;
        dpe->data.bezier_to[1].y = (dp->bbox.y0+cy)+kappa;
        dpe->data.bezier_to[2].x = (dp->bbox.x0+cx)+radius;
        dpe->data.bezier_to[2].y = (dp->bbox.y0+cy);
        memcpy((char*)&dp->path+40, dpe, 28);

        /* c->d : (x+r, y)(x+r, y-k)(x+k, y-r)(x, y-r) */
        dpe->tag = draw_BEZIER_TO;
        dpe->data.bezier_to[0].x = (dp->bbox.x0+cx)+radius;
        dpe->data.bezier_to[0].y = (dp->bbox.y0+cy)-kappa;
        dpe->data.bezier_to[1].x = (dp->bbox.x0+cx)+kappa;
        dpe->data.bezier_to[1].y = (dp->bbox.y0+cy)-radius;
        dpe->data.bezier_to[2].x = (dp->bbox.x0+cx);
        dpe->data.bezier_to[2].y = (dp->bbox.y0+cy)-radius;
        memcpy((char*)&dp->path+68, dpe, 28);

        /* d->a : (x, y-r)(x-k, y-r)(x-r, y-k)(x-r, y)*/
        dpe->tag = draw_BEZIER_TO;
        dpe->data.bezier_to[0].x = (dp->bbox.x0+cx)-kappa;
        dpe->data.bezier_to[0].y = (dp->bbox.y0+cy)-radius;
        dpe->data.bezier_to[1].x = (dp->bbox.x0+cx)-radius;
        dpe->data.bezier_to[1].y = (dp->bbox.y0+cy)-kappa;
        dpe->data.bezier_to[2].x = (dp->bbox.x0+cx)-radius;
        dpe->data.bezier_to[2].y = (dp->bbox.y0+cy);
        memcpy((char*)&dp->path+96, dpe, 28);

        /* end */
        dpe->tag = draw_END_PATH;
        memcpy((char*)&dp->path+124, dpe, 4);

        dro->type = drawfile_TYPE_PATH;
        dro->size = 8+160;
        memcpy((char*)&dro->data.path, dp, (unsigned)dro->size-8);

        d = xrealloc(d, length+dro->size);
        memcpy((char*)d+length, dro, (unsigned)dro->size);

        length += dro->size;

        xfree(dpe);
        xfree(dp);
        xfree(dro);
}
#endif