ass_render.c

来自「君正早期ucos系统(只有早期的才不没有打包成库),MPLAYER,文件系统,图」· C语言 代码 · 共 2,195 行 · 第 1/5 页

		shift.x = pen.x & 63;
		shift.y = pen.y & 63;

		ass_font_set_transform(render_context.font,
				       render_context.scale_x * frame_context.font_scale_x,
				       render_context.scale_y,
				       &shift );

		get_outline_glyph(code, text_info.glyphs + text_info.length, &shift);
		
		text_info.glyphs[text_info.length].pos.x = pen.x >> 6;
		text_info.glyphs[text_info.length].pos.y = pen.y >> 6;
		
		pen.x += text_info.glyphs[text_info.length].advance.x;
		pen.x += double_to_d6(render_context.hspacing);
		pen.y += text_info.glyphs[text_info.length].advance.y;
		
		previous = code;

		text_info.glyphs[text_info.length].symbol = code;
		text_info.glyphs[text_info.length].linebreak = 0;
		for (i = 0; i < 4; ++i) {
			uint32_t clr = render_context.c[i];
			change_alpha(&clr, mult_alpha(_a(clr), render_context.fade), 1.);
			text_info.glyphs[text_info.length].c[i] = clr;
		}
		text_info.glyphs[text_info.length].effect_type = render_context.effect_type;
		text_info.glyphs[text_info.length].effect_timing = render_context.effect_timing;
		text_info.glyphs[text_info.length].effect_skip_timing = render_context.effect_skip_timing;
		text_info.glyphs[text_info.length].be = render_context.be;
		text_info.glyphs[text_info.length].shadow = render_context.shadow;
		text_info.glyphs[text_info.length].frx = render_context.frx;
		text_info.glyphs[text_info.length].fry = render_context.fry;
		text_info.glyphs[text_info.length].frz = render_context.frz;
		ass_font_get_asc_desc(render_context.font, code,
				      &text_info.glyphs[text_info.length].asc,
				      &text_info.glyphs[text_info.length].desc);
		text_info.glyphs[text_info.length].asc *= render_context.scale_y;
		text_info.glyphs[text_info.length].desc *= render_context.scale_y;

		// fill bitmap_hash_key
		text_info.glyphs[text_info.length].hash_key.font = render_context.font;
		text_info.glyphs[text_info.length].hash_key.size = render_context.font_size;
		text_info.glyphs[text_info.length].hash_key.outline = render_context.border * 0xFFFF;
		text_info.glyphs[text_info.length].hash_key.scale_x = render_context.scale_x * 0xFFFF;
		text_info.glyphs[text_info.length].hash_key.scale_y = render_context.scale_y * 0xFFFF;
		text_info.glyphs[text_info.length].hash_key.frx = render_context.frx * 0xFFFF;
		text_info.glyphs[text_info.length].hash_key.fry = render_context.fry * 0xFFFF;
		text_info.glyphs[text_info.length].hash_key.frz = render_context.frz * 0xFFFF;
		text_info.glyphs[text_info.length].hash_key.bold = render_context.bold;
		text_info.glyphs[text_info.length].hash_key.italic = render_context.italic;
		text_info.glyphs[text_info.length].hash_key.ch = code;
		text_info.glyphs[text_info.length].hash_key.advance = shift;
		text_info.glyphs[text_info.length].hash_key.be = render_context.be;

		text_info.length++;

		render_context.effect_type = EF_NONE;
		render_context.effect_timing = 0;
		render_context.effect_skip_timing = 0;
	}
	
	if (text_info.length == 0) {
		// no valid symbols in the event; this can be smth like {comment}
		free_render_context();
		return 1;
	}
	
	// depends on glyph x coordinates being monotonous, so it should be done before line wrap
	process_karaoke_effects();
	
	// alignments
	alignment = render_context.alignment;
	halign = alignment & 3;
	valign = alignment & 12;

	MarginL = (event->MarginL) ? event->MarginL : render_context.style->MarginL; 
	MarginR = (event->MarginR) ? event->MarginR : render_context.style->MarginR; 
	MarginV = (event->MarginV) ? event->MarginV : render_context.style->MarginV;

	if (render_context.evt_type != EVENT_HSCROLL) {
		int max_text_width;

		// calculate max length of a line
		max_text_width = x2scr(frame_context.track->PlayResX - MarginR) - x2scr(MarginL);

		// rearrange text in several lines
		wrap_lines_smart(max_text_width);

		// align text
		last_break = -1;
		for (i = 1; i < text_info.length + 1; ++i) { // (text_info.length + 1) is the end of the last line
			if ((i == text_info.length) || text_info.glyphs[i].linebreak) {
				int width, shift = 0;
				glyph_info_t* first_glyph = text_info.glyphs + last_break + 1;
				glyph_info_t* last_glyph = text_info.glyphs + i - 1;

				while ((last_glyph > first_glyph) && ((last_glyph->symbol == '\n') || (last_glyph->symbol == 0)))
					last_glyph --;

				width = last_glyph->pos.x + d6_to_int(last_glyph->advance.x) - first_glyph->pos.x;
				if (halign == HALIGN_LEFT) { // left aligned, no action
					shift = 0;
				} else if (halign == HALIGN_RIGHT) { // right aligned
					shift = max_text_width - width;
				} else if (halign == HALIGN_CENTER) { // centered
					shift = (max_text_width - width) / 2;
				}
				for (j = last_break + 1; j < i; ++j) {
					text_info.glyphs[j].pos.x += shift;
				}
				last_break = i - 1;
			}
		}
	} else { // render_context.evt_type == EVENT_HSCROLL
		measure_text();
	}
	
	// determing text bounding box
	compute_string_bbox(&text_info, &bbox);
	
	// determine device coordinates for text
	
	// x coordinate for everything except positioned events
	if (render_context.evt_type == EVENT_NORMAL ||
	    render_context.evt_type == EVENT_VSCROLL) {
		device_x = x2scr(MarginL);
	} else if (render_context.evt_type == EVENT_HSCROLL) {
		if (render_context.scroll_direction == SCROLL_RL)
			device_x = x2scr(frame_context.track->PlayResX - render_context.scroll_shift);
		else if (render_context.scroll_direction == SCROLL_LR)
			device_x = x2scr(render_context.scroll_shift) - (bbox.xMax - bbox.xMin);
	}

	// y coordinate for everything except positioned events
	if (render_context.evt_type == EVENT_NORMAL ||
	    render_context.evt_type == EVENT_HSCROLL) {
		if (valign == VALIGN_TOP) { // toptitle
			device_y = y2scr_top(MarginV) + d6_to_int(text_info.lines[0].asc);
		} else if (valign == VALIGN_CENTER) { // midtitle
			int scr_y = y2scr(frame_context.track->PlayResY / 2);
			device_y = scr_y - (bbox.yMax - bbox.yMin) / 2;
		} else { // subtitle
			int scr_y;
			if (valign != VALIGN_SUB)
				mp_msg(MSGT_ASS, MSGL_V, "Invalid valign, supposing 0 (subtitle)\n");
			scr_y = y2scr_sub(frame_context.track->PlayResY - MarginV);
			device_y = scr_y;
			device_y -= d6_to_int(text_info.height);
			device_y += d6_to_int(text_info.lines[0].asc);
		}
	} else if (render_context.evt_type == EVENT_VSCROLL) {
		if (render_context.scroll_direction == SCROLL_TB)
			device_y = y2scr(render_context.clip_y0 + render_context.scroll_shift) - (bbox.yMax - bbox.yMin);
		else if (render_context.scroll_direction == SCROLL_BT)
			device_y = y2scr(render_context.clip_y1 - render_context.scroll_shift);
	}

	// positioned events are totally different
	if (render_context.evt_type == EVENT_POSITIONED) {
		int base_x = 0;
		int base_y = 0;
		mp_msg(MSGT_ASS, MSGL_DBG2, "positioned event at %d, %d\n", render_context.pos_x, render_context.pos_y);
		get_base_point(bbox, alignment, &base_x, &base_y);
		device_x = x2scr(render_context.pos_x) - base_x;
		device_y = y2scr(render_context.pos_y) - base_y;
	}
	
	// fix clip coordinates (they depend on alignment)
	render_context.clip_x0 = x2scr(render_context.clip_x0);
	render_context.clip_x1 = x2scr(render_context.clip_x1);
	if (render_context.evt_type == EVENT_NORMAL ||
	    render_context.evt_type == EVENT_HSCROLL ||
	    render_context.evt_type == EVENT_VSCROLL) {
		if (valign == VALIGN_TOP) {
			render_context.clip_y0 = y2scr_top(render_context.clip_y0);
			render_context.clip_y1 = y2scr_top(render_context.clip_y1);
		} else if (valign == VALIGN_CENTER) {
			render_context.clip_y0 = y2scr(render_context.clip_y0);
			render_context.clip_y1 = y2scr(render_context.clip_y1);
		} else if (valign == VALIGN_SUB) {
			render_context.clip_y0 = y2scr_sub(render_context.clip_y0);
			render_context.clip_y1 = y2scr_sub(render_context.clip_y1);
		}
	} else if (render_context.evt_type == EVENT_POSITIONED) {
		render_context.clip_y0 = y2scr(render_context.clip_y0);
		render_context.clip_y1 = y2scr(render_context.clip_y1);
	}

	// calculate rotation parameters
	{
		FT_Vector center;
		
		if (render_context.have_origin) {
			center.x = x2scr(render_context.org_x);
			center.y = y2scr(render_context.org_y);
		} else {
			int bx, by;
			get_base_point(bbox, alignment, &bx, &by);
			center.x = device_x + bx;
			center.y = device_y + by;
		}

		for (i = 0; i < text_info.length; ++i) {
			glyph_info_t* info = text_info.glyphs + i;

			if (info->hash_key.frx || info->hash_key.fry || info->hash_key.frz) {
				info->hash_key.shift_x = info->pos.x + device_x - center.x;
				info->hash_key.shift_y = - (info->pos.y + device_y - center.y);
			} else {
				info->hash_key.shift_x = 0;
				info->hash_key.shift_y = 0;
			}
		}
	}

	// convert glyphs to bitmaps
	for (i = 0; i < text_info.length; ++i)
		get_bitmap_glyph(text_info.glyphs + i);

	event_images->top = device_y - d6_to_int(text_info.lines[0].asc);
	event_images->height = d6_to_int(text_info.height);
	event_images->detect_collisions = render_context.detect_collisions;
	event_images->shift_direction = (valign == VALIGN_TOP) ? 1 : -1;
	event_images->event = event;
	event_images->imgs = render_text(&text_info, device_x, device_y);

	free_render_context();
	
	return 0;
}

/**
 * \brief deallocate image list
 * \param img list pointer
 */
void ass_free_images(ass_image_t* img)
{
	while (img) {
		ass_image_t* next = img->next;
		free(img);
		img = next;
	}
}

static void ass_reconfigure(ass_renderer_t* priv)
{
	priv->render_id = ++last_render_id;
	ass_glyph_cache_reset();
	ass_bitmap_cache_reset();
	ass_free_images(priv->prev_images_root);
	priv->prev_images_root = 0;
}

void ass_set_frame_size(ass_renderer_t* priv, int w, int h)
{
	if (priv->settings.frame_width != w || priv->settings.frame_height != h) {
		priv->settings.frame_width = w;
		priv->settings.frame_height = h;
		if (priv->settings.aspect == 0.)
			priv->settings.aspect = ((double)w) / h;
		ass_reconfigure(priv);
	}
}

void ass_set_margins(ass_renderer_t* priv, int t, int b, int l, int r)
{
	if (priv->settings.left_margin != l ||
	    priv->settings.right_margin != r ||
	    priv->settings.top_margin != t ||
	    priv->settings.bottom_margin != b) {
		priv->settings.left_margin = l;
		priv->settings.right_margin = r;
		priv->settings.top_margin = t;
		priv->settings.bottom_margin = b;
		ass_reconfigure(priv);
	}
}

void ass_set_use_margins(ass_renderer_t* priv, int use)
{
	priv->settings.use_margins = use;
}

void ass_set_aspect_ratio(ass_renderer_t* priv, double ar)
{
	if (priv->settings.aspect != ar) {
		priv->settings.aspect = ar;
		ass_reconfigure(priv);
	}
}

void ass_set_font_scale(ass_renderer_t* priv, double font_scale)
{
	if (priv->settings.font_size_coeff != font_scale) {
		priv->settings.font_size_coeff = font_scale;
		ass_reconfigure(priv);
	}
}

void ass_set_hinting(ass_renderer_t* priv, ass_hinting_t ht)
{
	if (priv->settings.hinting != ht) {
		priv->settings.hinting = ht;
		ass_reconfigure(priv);
	}
}

void ass_set_line_spacing(ass_renderer_t* priv, double line_spacing)
{
	priv->settings.line_spacing = line_spacing;
}

int ass_set_fonts(ass_renderer_t* priv, const char* default_font, const char* default_family)
{
	if (priv->settings.default_font)
		free(priv->settings.default_font);
	if (priv->settings.default_family)
		free(priv->settings.default_family);

	priv->settings.default_font = default_font ? strdup(default_font) : 0;
	priv->settings.default_family = default_family ? strdup(default_family) : 0;

	if (priv->fontconfig_priv)
		fontconfig_done(priv->fontconfig_priv);
	priv->fontconfig_priv = fontconfig_init(priv->library, priv->ftlibrary, default_family, default_font);

	return !!priv->fontconfig_priv;
}

/**
 * \brief Start a new frame
 */
static int ass_start_frame(ass_renderer_t *priv, ass_track_t* track, long long now)
{
	ass_renderer = priv;
	global_settings = &priv->settings;

	if (!priv->settings.frame_width && !priv->settings.frame_height)
		return 1; // library not initialized
	
	frame_context.ass_priv = priv;
	frame_context.width = global_settings->frame_width;
	frame_context.height = global_settings->frame_height;
	frame_context.orig_width = global_settings->frame_width - global_settings->left_margin - global_settings->right_margin;
	frame_context.orig_height = global_settings->frame_height - global_settings->top_margin - global_settings->bottom_margin;
	frame_context.track = track;
	frame_context.time = now;

	ass_lazy_track_init();
	
	frame_context.font_scale = global_settings->font_size_coeff *
	                           frame_context.orig_height / frame_context.track->PlayResY;
	frame_context.border_scale = ((double)frame_context.orig_height) / frame_context.track->PlayResY;

	if (frame_context.orig_width * track->PlayResY == frame_context.orig_height * track->PlayResX)
		frame_context.font_scale_x = 1.;
	else
		frame_context.font_scale_x = ((double)(frame_context.orig_width * track->PlayResY)) / (frame_context.orig_height * track->PlayResX);

	priv->prev_images_root = priv->images_root;
	priv->images_root = 0;

	return 0;
}

static int cmp_event_layer(const void* p1, const void* p2)
{
	ass_event_t* e1 = ((event_images_t*)p1)->event;
	ass_event_t* e2 = ((event_images_t*)p2)->event;
	if (e1->Layer < e2->Layer)
		return -1;
	if (e1->Layer > e2->Layer)
		return 1;
	if (e1->ReadOrder < e2->ReadOrder)
		return -1;
	if (e1->ReadOrder > e2->ReadOrder)
		return 1;
	return 0;
}

#define MAX_EVENTS 100

static render_priv_t* get_render_priv(ass_event_t* event)
{
	if (!event->render_priv)
		event->render_priv = calloc(1, sizeof(render_priv_t));
	// FIXME: check render_id
	if (ass_renderer->render_id != event->render_priv->render_id) {
		memset(event->render_priv, 0, sizeof(render_priv_t));
		event->render_priv->render_id = ass_renderer->render_id;
	}
	return event->render_priv;
}

typedef struct segment_s {
	int a, b; // top and height
} segment_t;

static int overlap(segment_t* s1, segment_t* s2)
{
	if (s1->a >= s2->b || s2->a >= s1->b)
		return 0;
	return 1;
}

static int cmp_segment(const void* p1, const void* p2)
{
	return ((segment_t*)p1)->a - ((segment_t*)p2)->a;
}

static void shift_event(event_images_t* ei, int shift)
{
	ass_image_t* cur = ei->imgs;
	while (cur) {
		cur->dst_y += shift;
		// clip top and bottom
		if (cur->dst_y < 0) {
			int clip = - cur->dst_y;
			cur->h -= clip;
			cur->bitmap += clip * cur->stride;
			cur->dst_y = 0;
		}
		if (cur->dst_y + cur->h >= frame_context.height) {
			int clip = cur->dst_y + cur->h - frame_context.height;
			cur->h -= clip;
		}
		if (cur->h <= 0) {
			cur->h = 0;
			cur->dst_y = 0;
		}
		cur = cur->next;
	}
	ei->top += shift;
}

// dir: 1 - move down
//      -1 - move up