src/cdogs/font.c

/*
	Copyright (c) 2014-2017, 2019, 2021 Cong Xu
	All rights reserved.

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions are met:

	Redistributions of source code must retain the above copyright notice, this
	list of conditions and the following disclaimer.
	Redistributions in binary form must reproduce the above copyright notice,
	this list of conditions and the following disclaimer in the documentation
	and/or other materials provided with the distribution.

	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	POSSIBILITY OF SUCH DAMAGE.
*/
#include "font.h"

#include <stdio.h>
#include <string.h>

#ifdef __EMSCRIPTEN__
#include <SDL2/SDL_image.h>
#else
#include <SDL_image.h>
#endif

#include "blit.h"
#include "pic.h"
#include "sys_config.h"
#include "utils.h"


#define FIRST_CHAR 0
#define LAST_CHAR 255

Font gFont;


FontOpts FontOptsNew(void)
{
	FontOpts opts;
	memset(&opts, 0, sizeof opts);
	opts.Mask = colorWhite;
	return opts;
}

void FontLoad(
	Font *f, const char *imgPath, const bool isProportional,
	const struct vec2i spaceSize)
{
	char buf[CDOGS_PATH_MAX];
	GetDataFilePath(buf, imgPath);
	SDL_RWops *rwops = SDL_RWFromFile(buf, "rb");
	CASSERT(IMG_isPNG(rwops), "Error: font file is not PNG");
	SDL_Surface *image = IMG_Load_RW(rwops, 0);
	rwops->close(rwops);
	if (!image)
	{
		fprintf(stderr, "Cannot load font image: %s\n", IMG_GetError());
		goto bail;
	}
	if (image->format->BytesPerPixel != 4)
	{
		perror("Cannot load non-32-bit image");
		fprintf(stderr, "Only 32-bit depth images supported\n");
		goto bail;
	}

	CArrayInit(&f->Chars, sizeof(Pic));

	// Check that the image is big enough for the dimensions
	const struct vec2i step = svec2i(
		f->Size.x + f->Padding.Left + f->Padding.Right,
		f->Size.y + f->Padding.Top + f->Padding.Bottom);
	if (step.x * f->Stride > image->w || step.y > image->h)
	{
		fprintf(stderr,
			"Error: font image not big enough for font data "
			"Image %dx%d Size %dx%d Stride %d Padding %d,%d,%d,%d\n",
			image->w, image->h,
			f->Size.x, f->Size.y, f->Stride,
			f->Padding.Left, f->Padding.Top,
			f->Padding.Right, f->Padding.Bottom);
		goto bail;
	}

	// Load letters from image file
	SDL_LockSurface(image);
	int chars = 0;
	for (struct vec2i pos = svec2i_zero();
		pos.y + step.y <= image->h && chars < LAST_CHAR - FIRST_CHAR + 1;
		pos.y += step.y)
	{
		int x = 0;
		for (pos.x = 0;
			x < f->Stride && chars < LAST_CHAR - FIRST_CHAR + 1;
			pos.x += step.x, x++, chars++)
		{
			Pic p;
			PicLoad(
				&p, f->Size,
				svec2i_add(pos, svec2i(f->Padding.Left, f->Padding.Top)),
				image);
			if (chars == ' ')
			{
				PicShrink(&p, spaceSize, svec2i_zero());
			}
			else if (isProportional)
			{
				PicTrim(&p, true, false);
			}
			CArrayPushBack(&f->Chars, &p);
		}
	}
	SDL_UnlockSurface(image);

bail:
	SDL_FreeSurface(image);
}
void FontTerminate(Font *f)
{
	CA_FOREACH(Pic, p, f->Chars)
		PicFree(p);
	CA_FOREACH_END()
	CArrayTerminate(&f->Chars);
}

int FontW(const char c)
{
	const Pic *p = CArrayGet(&gFont.Chars, (int)c - FIRST_CHAR);
	return p->size.x + gFont.Gap.x;
}
int FontH(void)
{
	return gFont.Size.y + gFont.Gap.y;
}
struct vec2i FontChSize(const char c)
{
	return svec2i(FontW(c), FontH());
}
int FontStrW(const char *s)
{
	return FontSubstrW(s, (int)strlen(s));
}
int FontSubstrW(const char *s, int len)
{
	if (len > (int)strlen(s))
	{
		len = (int)strlen(s);
	}
	// Find the width of the longest line, if this is a multi-line
	int maxWidth = 0;
	int w = 0;
	for (int i = 0; i < len; i++, s++)
	{
		if (*s == '\n')
		{
			maxWidth = MAX(maxWidth, w);
			w = 0;
		}
		else
		{
			w += FontW(*s);
		}
	}
	maxWidth = MAX(maxWidth, w);
	return maxWidth;
}
int FontStrH(const char *s)
{
	return FontStrNumLines(s) * FontH();
}
struct vec2i FontStrSize(const char *s)
{
	struct vec2i size = svec2i_zero();
	while (*s)
	{
		char *lineEnd = strchr(s, '\n');
		size.y += FontH();
		if (lineEnd)
		{
			size.x = MAX(size.x, FontSubstrW(s, (int)(lineEnd - s)));
			s = lineEnd + 1;
		}
		else
		{
			size.x = MAX(size.x, FontStrW(s));
			s += strlen(s);
		}
	}
	return size;
}
int FontStrNumLines(const char *s)
{
	int lines;
	for (lines = 0; s != NULL; lines++)
	{
		s = strchr(s, '\n');
		if (s)
		{
			s++;
		}
	}
	return lines;
}

struct vec2i FontCh(const char c, const struct vec2i pos)
{
	return FontChMask(c, pos, colorWhite);
}
struct vec2i FontChMask(const char c, const struct vec2i pos, const color_t mask)
{
	int idx = (int)c - FIRST_CHAR;
	if (idx < 0)
	{
		idx += 256;
	}
	if (idx < FIRST_CHAR || idx > LAST_CHAR)
	{
		fprintf(stderr, "invalid char %d\n", idx);
		idx = FIRST_CHAR;
	}
	const Pic *pic = CArrayGet(&gFont.Chars, idx);
	PicRender(
		pic, gGraphicsDevice.gameWindow.renderer, pos, mask, 0, svec2_one(),
		SDL_FLIP_NONE, Rect2iZero());
	// Add gap between characters
	return svec2i(pos.x + pic->size.x + gFont.Gap.x, pos.y);
}
struct vec2i FontStr(const char *s, struct vec2i pos)
{
	return FontStrMask(s, pos, colorWhite);
}
struct vec2i FontStrMask(const char *s, struct vec2i pos, const color_t mask)
{
	if (s == NULL)
	{
		return pos;
	}
	int left = pos.x;
	while (*s)
	{
		if (*s == '\n')
		{
			pos.x = left;
			pos.y += FontH();
		}
		else
		{
			pos = FontChMask(*s, pos, mask);
		}
		s++;
	}
	return pos;
}
struct vec2i FontStrMaskWrap(const char *s, struct vec2i pos, color_t mask, const int width)
{
	char buf[1024];
	CASSERT(strlen(s) < 1024, "string too long to wrap");
	FontSplitLines(s, buf, width);
	return FontStrMask(buf, pos, mask);
}
static struct vec2i GetStrPos(const char *s, struct vec2i pos, const FontOpts opts);
void FontStrOpt(const char *s, struct vec2i pos, const FontOpts opts)
{
	if (s == NULL)
	{
		return;
	}
	pos = GetStrPos(s, pos, opts);
	FontStrMask(s, pos, opts.Mask);
}
static int GetAlign(
	const FontAlign align,
	const int pos, const int pad, const int area, const int size);
static struct vec2i GetStrPos(const char *s, struct vec2i pos, const FontOpts opts)
{
	const struct vec2i textSize = FontStrSize(s);
	return svec2i(
		GetAlign(opts.HAlign, pos.x, opts.Pad.x, opts.Area.x, textSize.x),
		GetAlign(opts.VAlign, pos.y, opts.Pad.y, opts.Area.y, textSize.y));
}
static int GetAlign(
	const FontAlign align,
	const int pos, const int pad, const int area, const int size)
{
	switch (align)
	{
	case ALIGN_START:
		return pos + pad;
		break;
	case ALIGN_CENTER:
		return pos + (area - size) / 2;
		break;
	case ALIGN_END:
		return pos + area - size - pad;
		break;
	default:
		CASSERT(false, "unknown align");
		return pos;
	}
}

void FontStrCenter(const char *s)
{
	FontOpts opts = FontOptsNew();
	opts.HAlign = ALIGN_CENTER;
	opts.VAlign = ALIGN_CENTER;
	opts.Area = gGraphicsDevice.cachedConfig.Res;
	FontStrOpt(s, svec2i_zero(), opts);
}

void FontSplitLines(const char *text, char *buf, const int width)
{
	if (width == 0)
	{
		strcpy(buf, text);
		return;
	}
	int ix, x;
	const char *ws, *word, *s;

	ix = x = CenterX(width);
	s = ws = word = text;

	while (*s)
	{
		// Skip spaces
		ws = s;
		while (*s == ' ' || *s == '\n')
		{
			*buf++ = *s;
			if (*s == '\n')
			{
				// We've already skipped a word, so reset the word count
				ws = s + 1;
				x = ix;
			}
			s++;
		}

		// Find word
		word = s;
		while (*s != 0 && *s != ' ' && *s != '\n')
		{
			s++;
		}
		// Calculate width of word
		int w;
		const char *p;
		for (w = 0, p = ws; p < s; p++)
		{
			w += FontW(*p);
		}

		// Create new line if text too wide
		if (x + w > width + ix && w < width)
		{
			x = ix;
			ws = word;
			*buf++ = '\n';
		}

		for (p = ws; p < word; p++)
		{
			x += FontW(*p);
		}

		for (p = word; p < s; p++)
		{
			*buf++ = *p;
			x += FontW(*p);
		}
	}
	*buf = '\0';
}

struct vec2i Vec2iAligned(
	const struct vec2i v, const struct vec2i size,
	const FontAlign hAlign, const FontAlign vAlign, const struct vec2i area)
{
	struct vec2i vAligned = v;
	switch (hAlign)
	{
	case ALIGN_CENTER:
		vAligned.x += (area.x - size.x) / 2;
		break;
	case ALIGN_END:
		vAligned.x = -v.x + area.x - size.x;
		break;
	default:
		break;
	}
	switch (vAlign)
	{
	case ALIGN_CENTER:
		vAligned.y += (area.y - size.y) / 2;
		break;
	case ALIGN_END:
		vAligned.y = -v.y + area.y - size.y;
		break;
	default:
		break;
	}
	return vAligned;
}