/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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; either version 2
 * of the License, or (at your option) any later version.

 * This program 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */


#include "sci/include/gfx_system.h"
#include "sci/include/gfx_resource.h"
#include "sci/include/gfx_tools.h"

int font_counter = 0;

void
gfxr_free_font(gfx_bitmap_font_t *font) {
	if (font->widths)
		free(font->widths);

	if (font->data)
		free(font->data);

	--font_counter;

	free(font);
}



void
scale_char(byte *dest, byte *src, int width, int height, int newwidth, int xfact, int yfact) {
	int x, y;

	for (y = 0; y < height; y++) {
		int yc;
		byte *bdest = dest;
		byte *bsrc = src;

		for (x = 0; x < width; x++) {
			int xbitc;
			int bits = 0;
			int value = 0;

			for (xbitc = 128; xbitc; xbitc >>= 1) {
				int xc;

				for (xc = 0; xc < xfact; xc++) {
					if (*bsrc & xbitc)
						value |= 1;
					value <<= 1;

					if (++bits == 8) {
						*bdest++ = value;
						bits = value = 0;
					}
				}
			}
			bsrc++;
		}

		src += width;
		for (yc = 1; yc < yfact; yc++) {
			memcpy(dest + newwidth, dest, newwidth);
			dest += newwidth;
		}
		dest += newwidth;
	}
}

gfx_bitmap_font_t *
gfxr_scale_font_unfiltered(gfx_bitmap_font_t *orig_font, gfx_mode_t *mode) {
	gfx_bitmap_font_t *font = (gfx_bitmap_font_t*)sci_malloc(sizeof(gfx_bitmap_font_t));
	int height = orig_font->height * mode->yfact;
	int width = 0;
	int byte_width;
	int i;

	font->chars_nr = orig_font->chars_nr;
	for (i = 0; i < font->chars_nr; i++)
		if (orig_font->widths[i] > width)
			width = orig_font->widths[i];

	width *= mode->xfact;
	byte_width = (width + 7) >> 3;
	if (byte_width == 3)
		byte_width = 4;
	if (byte_width > 4)
		byte_width = (byte_width + 3) & ~3;

	font->row_size = byte_width;
	font->height = height;
	font->line_height = orig_font->line_height * mode->yfact;

	font->widths = (int*)sci_malloc(sizeof(int) * orig_font->chars_nr);
	font->char_size = byte_width * height;
	font->data = (byte*)sci_malloc(font->chars_nr * font->char_size);

	for (i = 0; i < font->chars_nr; i++) {
		font->widths[i] = orig_font->widths[i] * mode->xfact;
		scale_char(font->data + font->char_size * i,
		           orig_font->data + orig_font->char_size * i,
		           orig_font->row_size, orig_font->height,
		           font->row_size,
		           mode->xfact, mode->yfact);
	}
	return font;
}


gfx_bitmap_font_t *
gfxr_scale_font(gfx_bitmap_font_t *orig_font, gfx_mode_t *mode, gfxr_font_scale_filter_t filter) {
	GFXWARN("This function hasn't been tested yet!\n");

	switch (filter) {

	case GFXR_FONT_SCALE_FILTER_NONE:
		return gfxr_scale_font_unfiltered(orig_font, mode);

	default:
		GFXERROR("Invalid font filter mode %d!\n", filter);
		return NULL;
	}
}




text_fragment_t *
gfxr_font_calculate_size(gfx_bitmap_font_t *font, int max_width, const char *text,
                         int *width, int *height,
                         int *lines, int *line_height_p, int *last_offset_p,
                         int flags) {
	int est_char_width = font->widths[(font->chars_nr > 'M')? 'M' : font->chars_nr - 1];
	/* 'M' is typically among the widest chars */
	int fragments_nr;
	text_fragment_t *fragments;
	int lineheight = font->line_height;
	int maxheight = lineheight;
	int last_breakpoint = 0;
	int last_break_width = 0;
	int max_allowed_width = max_width;
	int maxwidth = 0, localmaxwidth = 0;
	int current_fragment = 1;
	const char *breakpoint_ptr = NULL;
	unsigned char foo;

	if (line_height_p)
		*line_height_p = lineheight;

	if (max_width > 1) fragments_nr = 3 + (strlen(text) * est_char_width) * 3 / (max_width << 1);
	else fragments_nr = 1;

	fragments = (text_fragment_t*)sci_calloc(sizeof(text_fragment_t), fragments_nr);


	fragments[0].offset = text;

	while ((foo = *text++)) {

		if (foo >= font->chars_nr) {
			GFXWARN("Invalid char 0x%02x (max. 0x%02x) encountered in text string '%s', font %04x\n",
			        foo, font->chars_nr, text, font->ID);
			if (font->chars_nr > ' ')
				foo = ' ';
			else {
				free(fragments);
				return NULL;
			}
		}

		if (((foo == '\n') || (foo == 0x0d))
		        && !(flags & GFXR_FONT_FLAG_NO_NEWLINES)) {

			fragments[current_fragment-1].length = text - 1 - fragments[current_fragment-1].offset;

			if (*text)
				maxheight += lineheight;

			if (foo == 0x0d && *text == '\n')
				text++; /* Interpret DOS-style CR LF as single NL */

			fragments[current_fragment++].offset = text;

			if (localmaxwidth > maxwidth)
				maxwidth = localmaxwidth;

			if (current_fragment == fragments_nr)
				fragments = (text_fragment_t*)sci_realloc(fragments, sizeof(text_fragment_t) * (fragments_nr <<= 1));

			localmaxwidth = 0;

		} else { /* foo != '\n' */
			localmaxwidth += font->widths[foo];

			if (localmaxwidth > max_allowed_width) {
				int blank_break = 1; /* break is at a blank char, i.e. not within a word */

				maxheight += lineheight;

				if (last_breakpoint == 0) { /* Text block too long and without whitespace? */
					last_breakpoint = localmaxwidth - font->widths[foo];
					last_break_width = 0;
					--text;
					blank_break = 0; /* non-blank break */
				} else {
					text = breakpoint_ptr + 1;
					assert(breakpoint_ptr);
				}

				if (last_breakpoint == 0) {
					GFXWARN("Warning: maxsize %d too small for '%s'\n",
					        max_allowed_width, text);
				}

				if (last_breakpoint > maxwidth)
					maxwidth = last_breakpoint;

				fragments[current_fragment-1].length = text - blank_break - fragments[current_fragment-1].offset;
				fragments[current_fragment++].offset = text;

				if (current_fragment == fragments_nr)
					fragments = (text_fragment_t*)sci_realloc(fragments, sizeof(text_fragment_t *) * (fragments_nr <<= 1));

				localmaxwidth = localmaxwidth - last_breakpoint;
				if (!(flags & GFXR_FONT_FLAG_COUNT_WHITESPACE))
					localmaxwidth -= last_break_width;
				last_breakpoint = localmaxwidth = 0;

			} else if (*text == ' ') {
				last_breakpoint = localmaxwidth;
				last_break_width = font->widths[foo];
				breakpoint_ptr = text;
			}

		}
	}

	if (localmaxwidth > maxwidth)
		*width = localmaxwidth;
	else
		*width = maxwidth;

	if (last_offset_p)
		*last_offset_p = localmaxwidth;

	if (height)
		*height = maxheight;
	if (lines)
		*lines = current_fragment;

	fragments[current_fragment-1].length = text - fragments[current_fragment-1].offset - 1;

	return fragments;
}


static inline void
render_char(byte *dest, byte *src, int width, int line_width, int lines, int bytes_per_src_line, int fg0, int fg1, int bg) {
	int x, y;

	for (y = 0; y < lines; y++) {
		int dat = 0;
		byte *vdest = dest;
		byte *vsrc = src;
		int xc = 0;

		for (x = 0; x < width; x++) {
			if (!xc) {
				dat = *vsrc++;
				xc = 8;
			}
			xc--;

			if (dat & 0x80)
				*vdest++ = ((xc ^ y) & 1) ? fg0 : fg1; /* dither */
			else
				*vdest++ = bg;

			dat <<= 1;
		}
		src += bytes_per_src_line;
		dest += line_width;
	}
}

gfx_pixmap_t *
gfxr_draw_font(gfx_bitmap_font_t *font, const char *stext, int characters,
               gfx_pixmap_color_t *fg0, gfx_pixmap_color_t *fg1, gfx_pixmap_color_t *bg) {
	unsigned char *text = (unsigned char *) stext;
	int height = font->height;
	int width = 0;
	gfx_pixmap_t *pxm;
	int fore_0, fore_1, back;
	int i;
	int hack = 0;
	gfx_pixmap_color_t dummy = {0, 0, 0, 0};
	byte *offset;

	for (i = 0; i < characters; i++) {
		int ch = (int) text[i];

		if (ch >= font->chars_nr) {
			GFXERROR("Invalid character 0x%02x encountered!\n", text[i]);
			return NULL;
		}

		width += font->widths[ch];
	}

	pxm = gfx_pixmap_alloc_index_data(gfx_new_pixmap(width, height, GFX_RESID_NONE, 0, 0));

	pxm->colors_nr = !!fg0 + !!fg1 + !!bg;
	if (pxm->colors_nr == 0) {
		GFXWARN("Pixmap would have zero colors, resetting!\n");
		pxm->colors_nr = 3;
		hack = 1;
		fg0 = fg1 = bg = &dummy;
	}
	pxm->colors = (gfx_pixmap_color_t*)sci_malloc(sizeof(gfx_pixmap_color_t) * pxm->colors_nr);
#ifdef SATISFY_PURIFY
	memset(pxm->colors, 0, sizeof(gfx_pixmap_color_t) * pxm->colors_nr);
#endif
	pxm->flags |= GFX_PIXMAP_FLAG_PALETTE_ALLOCATED | GFX_PIXMAP_FLAG_DONT_UNALLOCATE_PALETTE;

	i = 0;

	if (fg0 || hack) {
		memcpy(pxm->colors + i, fg0, sizeof(gfx_pixmap_color_t));
		fore_0 = i++;
	} else fore_0 = pxm->color_key;

	if (fg1 || hack) {
		memcpy(pxm->colors + i, fg1, sizeof(gfx_pixmap_color_t));
		fore_1 = i++;
	} else fore_1 = pxm->color_key;

	if (bg || hack) {
		memcpy(pxm->colors + i, bg, sizeof(gfx_pixmap_color_t));
		back = i++;
	} else back = pxm->color_key;

	offset = pxm->index_data;

	memset(pxm->index_data, back, pxm->index_xl * pxm->index_yl);
	for (i = 0; i < characters; i++) {
		unsigned char ch = text[i];
		width = font->widths[ch];

		render_char(offset, font->data + (ch * font->char_size), width,
		            pxm->index_xl, pxm->index_yl, font->row_size,
		            fore_0, fore_1, back);

		offset += width;
	}

	return pxm;
}