path: root/fitz/dev_svg.c

#include "mupdf/fitz.h"

typedef struct svg_device_s svg_device;

typedef struct tile_s tile;

struct tile_s
{
	int pattern;
	fz_matrix ctm;
	fz_rect view;
	fz_rect area;
	fz_point step;
};

struct svg_device_s
{
	fz_context *ctx;
	fz_output *out;

	int id;

	int num_tiles;
	int max_tiles;
	tile *tiles;
};

/* Helper functions */

static void
svg_dev_path(svg_device *sdev, fz_path *path)
{
	fz_output *out = sdev->out;
	float x, y;
	int i = 0;
	fz_printf(out, " d=\"");
	while (i < path->len)
	{
		switch (path->items[i++].k)
		{
		case FZ_MOVETO:
			x = path->items[i++].v;
			y = path->items[i++].v;
			fz_printf(out, "M %g %g ", x, y);
			break;
		case FZ_LINETO:
			x = path->items[i++].v;
			y = path->items[i++].v;
			fz_printf(out, "L %g %g ", x, y);
			break;
		case FZ_CURVETO:
			x = path->items[i++].v;
			y = path->items[i++].v;
			fz_printf(out, "C %g %g ", x, y);
			x = path->items[i++].v;
			y = path->items[i++].v;
			fz_printf(out, "%g %g ", x, y);
			x = path->items[i++].v;
			y = path->items[i++].v;
			fz_printf(out, "%g %g ", x, y);
			break;
		case FZ_CLOSE_PATH:
			fz_printf(out, "Z ");
			break;
		}
	}
	fz_printf(out, "\"");
}

static void
svg_dev_ctm(svg_device *sdev, const fz_matrix *ctm)
{
	fz_output *out = sdev->out;

	if (ctm->a != 1.0 || ctm->b != 0 || ctm->c != 0 || ctm->d != 1.0 || ctm->e != 0 || ctm->f != 0)
	{
		fz_printf(out, " transform=\"matrix(%g,%g,%g,%g,%g,%g)\"",
			ctm->a, ctm->b, ctm->c, ctm->d, ctm->e, ctm->f);
	}
}

static void
svg_dev_stroke_state(svg_device *sdev, fz_stroke_state *stroke_state)
{
	fz_output *out = sdev->out;

	fz_printf(out, " stroke-width=\"%g\"", stroke_state->linewidth);
	fz_printf(out, " stroke-linecap=\"%s\"",
		(stroke_state->start_cap == FZ_LINECAP_SQUARE ? "square" :
			(stroke_state->start_cap == FZ_LINECAP_ROUND ? "round" : "butt")));
	if (stroke_state->dash_len != 0)
	{
		int i;
		fz_printf(out, " stroke-dasharray=");
		for (i = 0; i < stroke_state->dash_len; i++)
			fz_printf(out, "%c%g", (i == 0 ? '\"' : ','), stroke_state->dash_list[i]);
		fz_printf(out, "\"");
		if (stroke_state->dash_phase != 0)
			fz_printf(out, " stroke-dashoffset=\"%g\"", stroke_state->dash_phase);
	}
	if (stroke_state->linejoin == FZ_LINEJOIN_MITER || stroke_state->linejoin == FZ_LINEJOIN_MITER_XPS)
		fz_printf(out, " stroke-miterlimit=\"%g\"", stroke_state->miterlimit);
	fz_printf(out, " stroke-linejoin=\"%s\"",
		(stroke_state->linejoin == FZ_LINEJOIN_BEVEL ? "bevel" :
			(stroke_state->linejoin == FZ_LINEJOIN_ROUND ? "round" : "miter")));
}

static void
svg_dev_fill_color(svg_device *sdev, fz_colorspace *colorspace, float *color, float alpha)
{
	fz_context *ctx = sdev->ctx;
	fz_output *out = sdev->out;
	float rgb[FZ_MAX_COLORS];

	if (colorspace != fz_device_rgb(ctx))
	{
		/* If it's not rgb, make it rgb */
		colorspace->to_rgb(ctx, colorspace, color, rgb);
		color = rgb;
	}

	if (color[0] == 0 && color[1] == 0 && color[2] == 0)
	{
		/* don't send a fill, as it will be assumed to be black */
	}
	else
		fz_printf(out, " fill=\"rgb(%d,%d,%d)\"", (int)(255*color[0] + 0.5), (int)(255*color[1] + 0.5), (int)(255*color[2]+0.5));
	if (alpha != 1)
		fz_printf(out, " fill-opacity=\"%g\"", alpha);
}

static void
svg_dev_stroke_color(svg_device *sdev, fz_colorspace *colorspace, float *color, float alpha)
{
	fz_context *ctx = sdev->ctx;
	fz_output *out = sdev->out;
	float rgb[FZ_MAX_COLORS];

	if (colorspace != fz_device_rgb(ctx))
	{
		/* If it's not rgb, make it rgb */
		colorspace->to_rgb(ctx, colorspace, color, rgb);
		color = rgb;
	}

	fz_printf(out, " fill=\"none\" stroke=\"rgb(%d,%d,%d)\"", (int)(255*color[0] + 0.5), (int)(255*color[1] + 0.5), (int)(255*color[2]+0.5));
	if (alpha != 1)
		fz_printf(out, " stroke-opacity=\"%g\"", alpha);
}

static void
svg_dev_text(svg_device *sdev, const fz_matrix *ctm, fz_text *text)
{
	fz_output *out = sdev->out;
	int i;
	fz_matrix inverse;
	fz_matrix local_trm;
	float size;

	/* Rely on the fact that trm.{e,f} == 0 */
	size = fz_matrix_expansion(&text->trm);
	local_trm.a = text->trm.a / size;
	local_trm.b = text->trm.b / size;
	local_trm.c = -text->trm.c / size;
	local_trm.d = -text->trm.d / size;
	local_trm.e = 0;
	local_trm.f = 0;
	fz_invert_matrix(&inverse, &local_trm);
	fz_concat(&local_trm, &local_trm, ctm);

	fz_printf(out, " transform=\"matrix(%g,%g,%g,%g,%g,%g)\"",
		local_trm.a, local_trm.b, local_trm.c, local_trm.d, local_trm.e, local_trm.f);
	fz_printf(out, " font-size=\"%g\"", size);
	fz_printf(out, " font-family=\"%s\"", text->font->name);

	fz_printf(out, " x=");
	for (i=0; i < text->len; i++)
	{
		fz_text_item *it = &text->items[i];
		fz_point p;
		p.x = it->x;
		p.y = it->y;
		fz_transform_point(&p, &inverse);
		fz_printf(out, "%c%g", i == 0 ? '\"' : ' ', p.x);
	}
	fz_printf(out, "\" y=");
	for (i=0; i < text->len; i++)
	{
		fz_text_item *it = &text->items[i];
		fz_point p;
		p.x = it->x;
		p.y = it->y;
		fz_transform_point(&p, &inverse);
		fz_printf(out, "%c%g", i == 0 ? '\"' : ' ', p.y);
	}
	fz_printf(out, "\">\n");
	for (i=0; i < text->len; i++)
	{
		fz_text_item *it = &text->items[i];
		int c = it->ucs;
		if (c >= 32 && c <= 127 && c != '<' && c != '&')
			fz_printf(out, "%c", c);
		else
			fz_printf(out, "&#x%04x;", c);
	}
	fz_printf(out, "\n</text>\n");
}

/* Entry points */

static void
svg_dev_fill_path(fz_device *dev, fz_path *path, int even_odd, const fz_matrix *ctm,
	fz_colorspace *colorspace, float *color, float alpha)
{
	svg_device *sdev = dev->user;
	fz_output *out = sdev->out;

	fz_printf(out, "<path");
	svg_dev_ctm(sdev, ctm);
	svg_dev_path(sdev, path);
	svg_dev_fill_color(sdev, colorspace, color, alpha);
	if (even_odd)
		fz_printf(out, " fill-rule=\"evenodd\" ");
	fz_printf(out, "/>\n");
}

static void
svg_dev_stroke_path(fz_device *dev, fz_path *path, fz_stroke_state *stroke, const fz_matrix *ctm,
	fz_colorspace *colorspace, float *color, float alpha)
{
	svg_device *sdev = dev->user;
	fz_output *out = sdev->out;

	fz_printf(out, "<path");
	svg_dev_ctm(sdev, ctm);
	svg_dev_stroke_state(sdev, stroke);
	svg_dev_stroke_color(sdev, colorspace, color, alpha);
	svg_dev_path(sdev, path);
	fz_printf(out, "/>\n");
}

static void
svg_dev_clip_path(fz_device *dev, fz_path *path, const fz_rect *rect, int even_odd, const fz_matrix *ctm)
{
	svg_device *sdev = dev->user;
	fz_output *out = sdev->out;
	int num = sdev->id++;

	fz_printf(out, "<clipPath id=\"cp%d\">\n", num);
	fz_printf(out, "<path");
	svg_dev_ctm(sdev, ctm);
	svg_dev_path(sdev, path);
	if (even_odd)
		fz_printf(out, " fill-rule=\"evenodd\" ");
	fz_printf(out, "/>\n</clipPath>\n<g clip-path=\"url(#cp%d)\">\n", num);
}

static void
svg_dev_clip_stroke_path(fz_device *dev, fz_path *path, const fz_rect *rect, fz_stroke_state *stroke, const fz_matrix *ctm)
{
	svg_device *sdev = dev->user;
	fz_output *out = sdev->out;
	fz_context *ctx = dev->ctx;
	fz_rect bounds;
	int num = sdev->id++;
	float white[3] = { 255, 255, 255 };

	fz_bound_path(ctx, path, stroke, ctm, &bounds);

	fz_printf(out, "<mask id=\"ma%d\" x=\"%g\" y=\"%g\" width=\"%g\" height=\"%g\" maskUnits=\"userSpaceOnUse\" maskContentUnits=\"userSpaceOnUse\" >\n",
		num, bounds.x0, bounds.y0, bounds.x1 - bounds.x0, bounds.y1 - bounds.y0);
	fz_printf(out, "<path");
	svg_dev_ctm(sdev, ctm);
	svg_dev_stroke_state(sdev, stroke);
	svg_dev_stroke_color(sdev, fz_device_rgb(ctx), white, 1);
	svg_dev_path(sdev, path);
	fz_printf(out, "/>\n</mask>\n<g mask=\"url(#ma%d)\">\n", num);
}

static void
svg_dev_fill_text(fz_device *dev, fz_text *text, const fz_matrix *ctm,
	fz_colorspace *colorspace, float *color, float alpha)
{
	svg_device *sdev = dev->user;
	fz_output *out = sdev->out;

	fz_printf(out, "<text");
	svg_dev_fill_color(sdev, colorspace, color, alpha);
	svg_dev_text(sdev, ctm, text);
}

static void
svg_dev_stroke_text(fz_device *dev, fz_text *text, fz_stroke_state *stroke, const fz_matrix *ctm,
	fz_colorspace *colorspace, float *color, float alpha)
{
	svg_device *sdev = dev->user;
	fz_output *out = sdev->out;

	fz_printf(out, "<text");
	svg_dev_ctm(sdev, ctm);
	svg_dev_stroke_state(sdev, stroke);
	svg_dev_stroke_color(sdev, colorspace, color, alpha);
	svg_dev_text(sdev, ctm, text);
}

static void
svg_dev_clip_text(fz_device *dev, fz_text *text, const fz_matrix *ctm, int accumulate)
{
	svg_device *sdev = dev->user;
	fz_output *out = sdev->out;
	fz_context *ctx = dev->ctx;
	fz_rect bounds;
	int num = sdev->id++;
	float white[3] = { 255, 255, 255 };

	fz_bound_text(ctx, text, NULL, ctm, &bounds);

	fz_printf(out, "<mask id=\"ma%d\" x=\"%g\" y=\"%g\" width=\"%g\" height=\"%g\" maskUnits=\"userSpaceOnUse\" maskContentUnits=\"userSpaceOnUse\" >\n",
		num, bounds.x0, bounds.y0, bounds.x1 - bounds.x0, bounds.y1 - bounds.y0);
	fz_printf(out, "<text");
	svg_dev_fill_color(sdev, fz_device_rgb(ctx), white, 1.0f);
	svg_dev_text(sdev, ctm, text);
	fz_printf(out, "</mask>\n<g mask=\"url(#ma%d)\">\n", num);
}

static void
svg_dev_clip_stroke_text(fz_device *dev, fz_text *text, fz_stroke_state *stroke, const fz_matrix *ctm)
{
	svg_device *sdev = dev->user;
	fz_output *out = sdev->out;
	fz_context *ctx = dev->ctx;
	fz_rect bounds;
	int num = sdev->id++;
	float white[3] = { 255, 255, 255 };

	fz_bound_text(ctx, text, NULL, ctm, &bounds);

	fz_printf(out, "<mask id=\"ma%d\" x=\"%g\" y=\"%g\" width=\"%g\" height=\"%g\" maskUnits=\"userSpaceOnUse\" maskContentUnits=\"userSpaceOnUse\" >\n",
		num, bounds.x0, bounds.y0, bounds.x1 - bounds.x0, bounds.y1 - bounds.y0);
	fz_printf(out, "<text");
	svg_dev_stroke_state(sdev, stroke);
	svg_dev_stroke_color(sdev, fz_device_rgb(ctx), white, 1.0f);
	svg_dev_text(sdev, ctm, text);
	fz_printf(out, "</mask>\n<g mask=\"url(#ma%d)\">\n", num);
}

static void
svg_dev_ignore_text(fz_device *dev, fz_text *text, const fz_matrix *ctm)
{
}

static void
send_data_base64(fz_output *out, fz_buffer *buffer)
{
	int i, len;
	static const char set[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

	len = buffer->len/3;
	for (i = 0; i < len; i++)
	{
		int c = buffer->data[3*i];
		int d = buffer->data[3*i+1];
		int e = buffer->data[3*i+2];
		if ((i & 15) == 0)
			fz_printf(out, "\n");
		fz_printf(out, "%c%c%c%c", set[c>>2], set[((c&3)<<4)|(d>>4)], set[((d&15)<<2)|(e>>6)], set[e & 63]);
	}
	i *= 3;
	switch (buffer->len-i)
	{
		case 2:
		{
			int c = buffer->data[i];
			int d = buffer->data[i+1];
			fz_printf(out, "%c%c%c=", set[c>>2], set[((c&3)<<4)|(d>>4)], set[((d&15)<<2)]);
			break;
		}
	case 1:
		{
			int c = buffer->data[i];
			fz_printf(out, "%c%c==", set[c>>2], set[(c&3)<<4]);
			break;
		}
	default:
	case 0:
		break;
	}
}

static void
svg_dev_fill_image(fz_device *dev, fz_image *image, const fz_matrix *ctm, float alpha)
{
	svg_device *sdev = (svg_device *)dev->user;
	fz_context *ctx = dev->ctx;
	fz_output *out = sdev->out;
	fz_matrix local_ctm = *ctm;
	fz_matrix scale = { 1.0f/image->w, 0, 0, 1.0f/image->h, 0, 0};

	fz_concat(&local_ctm, &scale, ctm);
	fz_printf(out, "<image");
	svg_dev_ctm(sdev, &local_ctm);
	fz_printf(out, "width=\"%dpx\" height=\"%dpx\" xlink:href=\"data:", image->w, image->h);
	switch (image->buffer == NULL ? FZ_IMAGE_JPX : image->buffer->params.type)
	{
	case FZ_IMAGE_JPEG:
		fz_printf(out, "image/jpeg;base64,");
		send_data_base64(out, image->buffer->buffer);
		break;
	case FZ_IMAGE_PNG:
		fz_printf(out, "image/png;base64,");
		send_data_base64(out, image->buffer->buffer);
		break;
	default:
		{
			fz_buffer *buf = fz_image_as_png(ctx, image, image->w, image->h);
			fz_printf(out, "image/png;base64,");
			send_data_base64(out, buf);
			fz_drop_buffer(ctx, buf);
			break;
		}
	}
	fz_printf(out, "\"/>\n");
}

static void
svg_dev_fill_shade(fz_device *dev, fz_shade *shade, const fz_matrix *ctm, float alpha)
{
}

static void
svg_dev_fill_image_mask(fz_device *dev, fz_image *image, const fz_matrix *ctm,
fz_colorspace *colorspace, float *color, float alpha)
{
}

static void
svg_dev_clip_image_mask(fz_device *dev, fz_image *image, const fz_rect *rect, const fz_matrix *ctm)
{
	svg_device *sdev = dev->user;
	fz_output *out = sdev->out;

	fz_printf(out, "<g>\n");
}

static void
svg_dev_pop_clip(fz_device *dev)
{
	svg_device *sdev = (svg_device *)dev->user;
	fz_output *out = sdev->out;

	/* FIXME */
	fz_printf(out, "</g>\n");
}

static void
svg_dev_begin_mask(fz_device *dev, const fz_rect *bbox, int luminosity, fz_colorspace *colorspace, float *color)
{
}

static void
svg_dev_end_mask(fz_device *dev)
{

}

static void
svg_dev_begin_group(fz_device *dev, const fz_rect *bbox, int isolated, int knockout, int blendmode, float alpha)
{

}

static void
svg_dev_end_group(fz_device *dev)
{

}

static int
svg_dev_begin_tile(fz_device *dev, const fz_rect *area, const fz_rect *view, float xstep, float ystep, const fz_matrix *ctm, int id)
{
	svg_device *sdev = (svg_device *)dev->user;
	fz_output *out = sdev->out;
	fz_context *ctx = dev->ctx;
	fz_matrix inverse;
	int num;
	tile *t;

	if (sdev->num_tiles == sdev->max_tiles)
	{
		int n = (sdev->num_tiles == 0 ? 4 : sdev->num_tiles * 2);

		sdev->tiles = fz_resize_array(ctx, sdev->tiles, n, sizeof(tile));
		sdev->max_tiles = n;
	}
	num = sdev->num_tiles++;
	t = &sdev->tiles[num];
	t->area = *area;
	t->view = *view;
	t->ctm = *ctm;
	t->pattern = sdev->id++;
	t->step.x = xstep;
	t->step.y = ystep;

	/* view = area of our reference tile in pattern space.
	 * area = area to tile into in pattern space.
	 * xstep/ystep = pattern repeat step in pattern space.
	 * All of these need to be transformed by ctm to get to device space.
	 * SVG only allows us to specify pattern tiles as axis aligned
	 * rectangles, so we send these through as is, and ensure that the
	 * correct matrix is used on the fill.
	 */

	/* In svg, the reference tile is taken from (x,y) to (x+width,y+height)
	 * and is repeated at (x+n*width,y+m*height) for all integer n and m.
	 * This means that width and height correspond to xstep and ystep. */
	fz_printf(out, "<pattern id=\"pa%d\" patternUnits=\"userSpaceOnUse\" patternContentUnits=\"userSpaceOnUse\"",
		t->pattern);
	fz_printf(out, " x=\"%g\" y=\"%g\" width=\"%g\" height=\"%g\">\n",
		view->x0, view->y0, xstep, ystep);
	/* All the pattern contents will have their own ctm applied. Let's
	 * undo the current one to allow for this */
	fz_invert_matrix(&inverse, ctm);
	fz_printf(out, "<g");
	svg_dev_ctm(sdev, &inverse);
	fz_printf(out, ">\n");

	return 0;
}

static void
svg_dev_end_tile(fz_device *dev)
{
	svg_device *sdev = (svg_device *)dev->user;
	fz_output *out = sdev->out;
	int num;
	tile *t;

	if (sdev->num_tiles == 0)
		return;
	num = --sdev->num_tiles;
	t = &sdev->tiles[num];

	fz_printf(out, "</g>\n</pattern>\n");
	fz_printf(out, "<rect");
	svg_dev_ctm(sdev, &t->ctm);
	fz_printf(out, " fill=\"url(#pa%d)\" x=\"%g\" y=\"%g\" width=\"%g\" height=\"%g\"/>\n",
		t->pattern, t->area.x0, t->area.y0, t->area.x1 - t->area.x0, t->area.y1 - t->area.y0);
}

static void
svg_dev_free_user(fz_device *dev)
{
	svg_device *sdev = dev->user;
	fz_context *ctx = sdev->ctx;
	fz_output *out = sdev->out;

	fz_free(ctx, sdev->tiles);

	fz_printf(out, "</svg>\n");

	fz_free(ctx, sdev);
}

fz_device *fz_new_svg_device(fz_context *ctx, fz_output *out, float page_width, float page_height)
{
	svg_device *sdev = fz_malloc_struct(ctx, svg_device);
	fz_device *dev;

	fz_try(ctx)
	{
		sdev->ctx = ctx;
		sdev->out = out;
		sdev->id = 0;

		dev = fz_new_device(ctx, sdev);
	}
	fz_catch(ctx)
	{
		fz_free(ctx, sdev);
		fz_rethrow(ctx);
	}

	dev->free_user = svg_dev_free_user;

	dev->fill_path = svg_dev_fill_path;
	dev->stroke_path = svg_dev_stroke_path;
	dev->clip_path = svg_dev_clip_path;
	dev->clip_stroke_path = svg_dev_clip_stroke_path;

	dev->fill_text = svg_dev_fill_text;
	dev->stroke_text = svg_dev_stroke_text;
	dev->clip_text = svg_dev_clip_text;
	dev->clip_stroke_text = svg_dev_clip_stroke_text;
	dev->ignore_text = svg_dev_ignore_text;

	dev->fill_shade = svg_dev_fill_shade;
	dev->fill_image = svg_dev_fill_image;
	dev->fill_image_mask = svg_dev_fill_image_mask;
	dev->clip_image_mask = svg_dev_clip_image_mask;

	dev->pop_clip = svg_dev_pop_clip;

	dev->begin_mask = svg_dev_begin_mask;
	dev->end_mask = svg_dev_end_mask;
	dev->begin_group = svg_dev_begin_group;
	dev->end_group = svg_dev_end_group;

	dev->begin_tile = svg_dev_begin_tile;
	dev->end_tile = svg_dev_end_tile;

	fz_printf(out, "<?xml version=\"1.0\" standalone=\"no\"?>\n");
	fz_printf(out, "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n");
	fz_printf(out, "<svg xmlns=\"http://www.w3.org/2000/svg\" "
		"xmlns:xlink=\"http://www.w3.org/1999/xlink\" version=\"1.1\" "
		"width=\"%gcm\" height=\"%gcm\" viewBox=\"0 0 %g %g\">\n",
		page_width*2.54/72, page_height*2.54/72, page_width, page_height);

	return dev;
}