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fontstash.h
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fontstash.h
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// CHANGES BY JOHN BARTHOLOMEW, DOCUMENTED AS PER LICENSE CONDITION 2:
//
// * Code (both header and source) is wrapped with extern "C" when
// built in C++ mode, to ensure compatible linkage between C/C++
// files.
// * Add #include <stddef.h> which is needed to provide size_t.
//
// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
//
#ifndef FONS_H
#define FONS_H
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
#define FONS_INVALID -1
enum FONSflags {
FONS_ZERO_TOPLEFT = 1,
FONS_ZERO_BOTTOMLEFT = 2,
};
enum FONSalign {
// Horizontal align
FONS_ALIGN_LEFT = 1<<0, // Default
FONS_ALIGN_CENTER = 1<<1,
FONS_ALIGN_RIGHT = 1<<2,
FONS_MASK_HALIGN = 3,
// Vertical align
FONS_ALIGN_TOP = 1<<3,
FONS_ALIGN_MIDDLE = 1<<4,
FONS_ALIGN_BOTTOM = 1<<5,
FONS_ALIGN_BASELINE = 1<<6, // Default
FONS_MASK_VALIGN = 120,
};
enum FONSerrorCode {
// Font atlas is full.
FONS_ATLAS_FULL = 1,
// Scratch memory used to render glyphs is full, requested size reported in 'val', you may need to bump up FONS_SCRATCH_BUF_SIZE.
FONS_SCRATCH_FULL = 2,
// Calls to fonsPushState has craeted too large stack, if you need deep state stack bump up FONS_MAX_STATES.
FONS_STATES_OVERFLOW = 3,
// Trying to pop too many states fonsPopState().
FONS_STATES_UNDERFLOW = 4,
};
struct FONSparams {
int width, height;
unsigned char flags;
void* userPtr;
int (*renderCreate)(void* uptr, int width, int height);
void (*renderUpdate)(void* uptr, int* rect, const unsigned char* data);
void (*renderDraw)(void* uptr, const float* verts, const float* tcoords, const unsigned int* colors, int nverts);
void (*renderDelete)(void* uptr);
};
struct FONSquad
{
float x0,y0,s0,t0;
float x1,y1,s1,t1;
};
struct FONStextIter {
float x, y, scale, spacing;
short isize, iblur;
struct FONSfont* font;
struct FONSglyph* prevGlyph;
const char* str;
const char* end;
unsigned int utf8state;
};
// Contructor and destructor.
struct FONScontext* fonsCreateInternal(struct FONSparams* params);
void fonsDeleteInternal(struct FONScontext* s);
void fonsSetErrorCallback(struct FONScontext* s, void (*callback)(void* uptr, int error, int val), void* uptr);
// Add fonts
int fonsAddFont(struct FONScontext* s, const char* name, const char* path);
int fonsAddFontMem(struct FONScontext* s, const char* name, unsigned char* data, int ndata, int freeData);
int fonsGetFontByName(struct FONScontext* s, const char* name);
// State handling
void fonsPushState(struct FONScontext* s);
void fonsPopState(struct FONScontext* s);
void fonsClearState(struct FONScontext* s);
// State setting
void fonsSetSize(struct FONScontext* s, float size);
void fonsSetColor(struct FONScontext* s, unsigned int color);
void fonsSetSpacing(struct FONScontext* s, float spacing);
void fonsSetBlur(struct FONScontext* s, float blur);
void fonsSetAlign(struct FONScontext* s, int align);
void fonsSetFont(struct FONScontext* s, int font);
// Draw text
float fonsDrawText(struct FONScontext* s, float x, float y, const char* string, const char* end);
// Measure text
float fonsTextBounds(struct FONScontext* s, const char* string, const char* end, float* bounds);
void fonsVertMetrics(struct FONScontext* s, float* ascender, float* descender, float* lineh);
// Text iterator
int fonsTextIterInit(struct FONScontext* stash, struct FONStextIter* iter, float x, float y, const char* str, const char* end);
int fonsTextIterNext(struct FONScontext* stash, struct FONStextIter* iter, struct FONSquad* quad);
// Pull texture changes
const unsigned char* fonsGetTextureData(struct FONScontext* stash, int* width, int* height);
int fonsValidateTexture(struct FONScontext* s, int* dirty);
// Draws the stash texture for debugging
void fonsDrawDebug(struct FONScontext* s, float x, float y, unsigned int color);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif // FONS_H
#ifdef FONTSTASH_IMPLEMENTATION
#define FONS_NOTUSED(v) (void)sizeof(v)
#ifdef FONS_USE_FREETYPE
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_ADVANCES_H
#include <math.h>
#ifdef __cplusplus
extern "C" {
#endif
struct FONSttFontImpl {
FT_Face font;
};
static FT_Library ftLibrary;
int fons__tt_init()
{
FT_Error ftError;
ftError = FT_Init_FreeType(&ftLibrary);
return ftError == 0;
}
int fons__tt_loadFont(struct FONScontext *context, struct FONSttFontImpl *font, unsigned char *data, int dataSize)
{
FT_Error ftError;
FONS_NOTUSED(context);
//font->font.userdata = stash;
ftError = FT_New_Memory_Face(ftLibrary, (const FT_Byte*)data, dataSize, 0, &font->font);
return ftError == 0;
}
void fons__tt_getFontVMetrics(struct FONSttFontImpl *font, int *ascent, int *descent, int *lineGap)
{
*ascent = font->font->ascender;
*descent = font->font->descender;
*lineGap = font->font->height - (*ascent - *descent);
}
float fons__tt_getPixelHeightScale(struct FONSttFontImpl *font, float size)
{
return size / (font->font->ascender - font->font->descender);
}
int fons__tt_getGlyphIndex(struct FONSttFontImpl *font, int codepoint)
{
return FT_Get_Char_Index(font->font, codepoint);
}
int fons__tt_buildGlyphBitmap(struct FONSttFontImpl *font, int glyph, float size, float scale, int *advance, int *lsb, int *x0, int *y0, int *x1, int *y1)
{
FT_Error ftError;
FT_GlyphSlot ftGlyph;
FONS_NOTUSED(scale);
ftError = FT_Set_Pixel_Sizes(font->font, 0, (FT_UInt)(size * (float)font->font->units_per_EM / (float)(font->font->ascender - font->font->descender)));
if (ftError) return 0;
ftError = FT_Load_Glyph(font->font, glyph, FT_LOAD_RENDER);
if (ftError) return 0;
ftError = FT_Get_Advance(font->font, glyph, FT_LOAD_NO_SCALE, (FT_Fixed*)advance);
if (ftError) return 0;
ftGlyph = font->font->glyph;
*lsb = ftGlyph->metrics.horiBearingX;
*x0 = ftGlyph->bitmap_left;
*x1 = *x0 + ftGlyph->bitmap.width;
*y0 = -ftGlyph->bitmap_top;
*y1 = *y0 + ftGlyph->bitmap.rows;
return 1;
}
void fons__tt_renderGlyphBitmap(struct FONSttFontImpl *font, unsigned char *output, int outWidth, int outHeight, int outStride, float scaleX, float scaleY, int glyph)
{
FT_GlyphSlot ftGlyph = font->font->glyph;
int ftGlyphOffset = 0;
int x, y;
FONS_NOTUSED(outWidth);
FONS_NOTUSED(outHeight);
FONS_NOTUSED(scaleX);
FONS_NOTUSED(scaleY);
FONS_NOTUSED(glyph); // glyph has already been loaded by fons__tt_buildGlyphBitmap
for ( y = 0; y < ftGlyph->bitmap.rows; y++ ) {
for ( x = 0; x < ftGlyph->bitmap.width; x++ ) {
output[(y * outStride) + x] = ftGlyph->bitmap.buffer[ftGlyphOffset++];
}
}
}
int fons__tt_getGlyphKernAdvance(struct FONSttFontImpl *font, int glyph1, int glyph2)
{
FT_Vector ftKerning;
FT_Get_Kerning(font->font, glyph1, glyph2, FT_KERNING_DEFAULT, &ftKerning);
return ftKerning.x;
}
#else
#define STB_TRUETYPE_IMPLEMENTATION
static void* fons__tmpalloc(size_t size, void* up);
static void fons__tmpfree(void* ptr, void* up);
#define STBTT_malloc(x,u) fons__tmpalloc(x,u)
#define STBTT_free(x,u) fons__tmpfree(x,u)
#include "stb_truetype.h"
struct FONSttFontImpl {
stbtt_fontinfo font;
};
int fons__tt_init(struct FONScontext *context)
{
FONS_NOTUSED(context);
return 1;
}
int fons__tt_loadFont(struct FONScontext *context, struct FONSttFontImpl *font, unsigned char *data, int dataSize)
{
int stbError;
FONS_NOTUSED(dataSize);
font->font.userdata = context;
stbError = stbtt_InitFont(&font->font, data, 0);
return stbError;
}
void fons__tt_getFontVMetrics(struct FONSttFontImpl *font, int *ascent, int *descent, int *lineGap)
{
stbtt_GetFontVMetrics(&font->font, ascent, descent, lineGap);
}
float fons__tt_getPixelHeightScale(struct FONSttFontImpl *font, float size)
{
return stbtt_ScaleForPixelHeight(&font->font, size);
}
int fons__tt_getGlyphIndex(struct FONSttFontImpl *font, int codepoint)
{
return stbtt_FindGlyphIndex(&font->font, codepoint);
}
int fons__tt_buildGlyphBitmap(struct FONSttFontImpl *font, int glyph, float size, float scale, int *advance, int *lsb, int *x0, int *y0, int *x1, int *y1)
{
FONS_NOTUSED(size);
stbtt_GetGlyphHMetrics(&font->font, glyph, advance, lsb);
stbtt_GetGlyphBitmapBox(&font->font, glyph, scale, scale, x0, y0, x1, y1);
return 1;
}
void fons__tt_renderGlyphBitmap(struct FONSttFontImpl *font, unsigned char *output, int outWidth, int outHeight, int outStride, float scaleX, float scaleY, int glyph)
{
stbtt_MakeGlyphBitmap(&font->font, output, outWidth, outHeight, outStride, scaleX, scaleY, glyph);
}
int fons__tt_getGlyphKernAdvance(struct FONSttFontImpl *font, int glyph1, int glyph2)
{
return stbtt_GetGlyphKernAdvance(&font->font, glyph1, glyph2);
}
#endif
#ifndef FONS_SCRATCH_BUF_SIZE
# define FONS_SCRATCH_BUF_SIZE 16000
#endif
#ifndef FONS_HASH_LUT_SIZE
# define FONS_HASH_LUT_SIZE 256
#endif
#ifndef FONS_INIT_FONTS
# define FONS_INIT_FONTS 4
#endif
#ifndef FONS_INIT_GLYPHS
# define FONS_INIT_GLYPHS 256
#endif
#ifndef FONS_INIT_ATLAS_NODES
# define FONS_INIT_ATLAS_NODES 256
#endif
#ifndef FONS_VERTEX_COUNT
# define FONS_VERTEX_COUNT 1024
#endif
#ifndef FONS_MAX_STATES
# define FONS_MAX_STATES 20
#endif
static unsigned int fons__hashint(unsigned int a)
{
a += ~(a<<15);
a ^= (a>>10);
a += (a<<3);
a ^= (a>>6);
a += ~(a<<11);
a ^= (a>>16);
return a;
}
static int fons__mini(int a, int b)
{
return a < b ? a : b;
}
static int fons__maxi(int a, int b)
{
return a > b ? a : b;
}
struct FONSglyph
{
unsigned int codepoint;
int index;
int next;
short size, blur;
short x0,y0,x1,y1;
short xadv,xoff,yoff;
};
struct FONSfont
{
struct FONSttFontImpl font;
char name[64];
unsigned char* data;
int dataSize;
unsigned char freeData;
float ascender;
float descender;
float lineh;
struct FONSglyph* glyphs;
int cglyphs;
int nglyphs;
int lut[FONS_HASH_LUT_SIZE];
};
struct FONSstate
{
int font;
int align;
float size;
unsigned int color;
float blur;
float spacing;
};
struct FONSatlasNode {
short x, y, width;
};
struct FONSatlas
{
int width, height;
struct FONSatlasNode* nodes;
int nnodes;
int cnodes;
};
struct FONScontext
{
struct FONSparams params;
float itw,ith;
unsigned char* texData;
int dirtyRect[4];
struct FONSfont** fonts;
struct FONSatlas* atlas;
int cfonts;
int nfonts;
float verts[FONS_VERTEX_COUNT*2];
float tcoords[FONS_VERTEX_COUNT*2];
unsigned int colors[FONS_VERTEX_COUNT];
int nverts;
unsigned char scratch[FONS_SCRATCH_BUF_SIZE];
int nscratch;
struct FONSstate states[FONS_MAX_STATES];
int nstates;
void (*handleError)(void* uptr, int error, int val);
void* errorUptr;
};
static void* fons__tmpalloc(size_t size, void* up)
{
unsigned char* ptr;
struct FONScontext* stash = (struct FONScontext*)up;
if (stash->nscratch+(int)size > FONS_SCRATCH_BUF_SIZE) {
if (stash->handleError)
stash->handleError(stash->errorUptr, FONS_SCRATCH_FULL, stash->nscratch+(int)size);
return NULL;
}
ptr = stash->scratch + stash->nscratch;
stash->nscratch += (int)size;
return ptr;
}
static void fons__tmpfree(void* ptr, void* up)
{
(void)ptr;
(void)up;
// empty
}
// Copyright (c) 2008-2010 Bjoern Hoehrmann <bjoern@hoehrmann.de>
// See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details.
#define FONS_UTF8_ACCEPT 0
#define FONS_UTF8_REJECT 12
static unsigned int fons__decutf8(unsigned int* state, unsigned int* codep, unsigned int byte)
{
static const unsigned char utf8d[] = {
// The first part of the table maps bytes to character classes that
// to reduce the size of the transition table and create bitmasks.
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8,
// The second part is a transition table that maps a combination
// of a state of the automaton and a character class to a state.
0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12,
12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12,
12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12,
12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12,
12,36,12,12,12,12,12,12,12,12,12,12,
};
unsigned int type = utf8d[byte];
*codep = (*state != FONS_UTF8_ACCEPT) ?
(byte & 0x3fu) | (*codep << 6) :
(0xff >> type) & (byte);
*state = utf8d[256 + *state + type];
return *state;
}
// Atlas based on Skyline Pin Packer by Jukka Jylänki
static void fons__deleteAtlas(struct FONSatlas* atlas)
{
if (atlas == NULL) return;
if (atlas->nodes != NULL) free(atlas->nodes);
free(atlas);
}
static struct FONSatlas* fons__allocAtlas(int w, int h, int nnodes)
{
struct FONSatlas* atlas = NULL;
// Allocate memory for the font stash.
atlas = (struct FONSatlas*)malloc(sizeof(struct FONSatlas));
if (atlas == NULL) goto error;
memset(atlas, 0, sizeof(struct FONSatlas));
atlas->width = w;
atlas->height = h;
// Allocate space for skyline nodes
atlas->nodes = (struct FONSatlasNode*)malloc(sizeof(struct FONSatlasNode) * nnodes);
if (atlas->nodes == NULL) goto error;
memset(atlas->nodes, 0, sizeof(struct FONSatlasNode) * nnodes);
atlas->nnodes = 0;
atlas->cnodes = nnodes;
// Init root node.
atlas->nodes[0].x = 0;
atlas->nodes[0].y = 0;
atlas->nodes[0].width = (short)w;
atlas->nnodes++;
return atlas;
error:
if (atlas) fons__deleteAtlas(atlas);
return NULL;
}
static int fons__atlasInsertNode(struct FONSatlas* atlas, int idx, int x, int y, int w)
{
int i;
// Insert node
if (atlas->nnodes+1 > atlas->cnodes) {
atlas->cnodes = atlas->cnodes == 0 ? 8 : atlas->cnodes * 2;
atlas->nodes = (struct FONSatlasNode*)realloc(atlas->nodes, sizeof(struct FONSatlasNode) * atlas->cnodes);
if (atlas->nodes == NULL)
return 0;
}
for (i = atlas->nnodes; i > idx; i--)
atlas->nodes[i] = atlas->nodes[i-1];
atlas->nodes[idx].x = (short)x;
atlas->nodes[idx].y = (short)y;
atlas->nodes[idx].width = (short)w;
atlas->nnodes++;
return 1;
}
static void fons__atlasRemoveNode(struct FONSatlas* atlas, int idx)
{
int i;
if (atlas->nnodes == 0) return;
for (i = idx; i < atlas->nnodes-1; i++)
atlas->nodes[i] = atlas->nodes[i+1];
atlas->nnodes--;
}
static int fons__atlasAddSkylineLevel(struct FONSatlas* atlas, int idx, int x, int y, int w, int h)
{
int i;
// Insert new node
if (fons__atlasInsertNode(atlas, idx, x, y+h, w) == 0)
return 0;
// Delete skyline segments that fall under the shaodw of the new segment.
for (i = idx+1; i < atlas->nnodes; i++) {
if (atlas->nodes[i].x < atlas->nodes[i-1].x + atlas->nodes[i-1].width) {
int shrink = atlas->nodes[i-1].x + atlas->nodes[i-1].width - atlas->nodes[i].x;
atlas->nodes[i].x += (short)shrink;
atlas->nodes[i].width -= (short)shrink;
if (atlas->nodes[i].width <= 0) {
fons__atlasRemoveNode(atlas, i);
i--;
} else {
break;
}
} else {
break;
}
}
// Merge same height skyline segments that are next to each other.
for (i = 0; i < atlas->nnodes-1; i++) {
if (atlas->nodes[i].y == atlas->nodes[i+1].y) {
atlas->nodes[i].width += atlas->nodes[i+1].width;
fons__atlasRemoveNode(atlas, i+1);
i--;
}
}
return 1;
}
static int fons__atlasRectFits(struct FONSatlas* atlas, int i, int w, int h)
{
// Checks if there is enough space at the location of skyline span 'i',
// and return the max height of all skyline spans under that at that location,
// (think tetris block being dropped at that position). Or -1 if no space found.
int x = atlas->nodes[i].x;
int y = atlas->nodes[i].y;
int spaceLeft;
if (x + w > atlas->width)
return -1;
spaceLeft = w;
while (spaceLeft > 0) {
if (i == atlas->nnodes) return -1;
y = fons__maxi(y, atlas->nodes[i].y);
if (y + h > atlas->height) return -1;
spaceLeft -= atlas->nodes[i].width;
++i;
}
return y;
}
static int fons__atlasAddRect(struct FONSatlas* atlas, int rw, int rh, int* rx, int* ry)
{
int besth = atlas->height, bestw = atlas->width, besti = -1;
int bestx = -1, besty = -1, i;
// Bottom left fit heuristic.
for (i = 0; i < atlas->nnodes; i++) {
int y = fons__atlasRectFits(atlas, i, rw, rh);
if (y != -1) {
if (y + rh < besth || (y + rh == besth && atlas->nodes[i].width < bestw)) {
besti = i;
bestw = atlas->nodes[i].width;
besth = y + rh;
bestx = atlas->nodes[i].x;
besty = y;
}
}
}
if (besti == -1)
return 0;
// Perform the actual packing.
if (fons__atlasAddSkylineLevel(atlas, besti, bestx, besty, rw, rh) == 0)
return 0;
*rx = bestx;
*ry = besty;
return 1;
}
static void fons__addWhiteRect(struct FONScontext* stash, int w, int h)
{
int x, y, gx, gy;
unsigned char* dst;
if (fons__atlasAddRect(stash->atlas, w, h, &gx, &gy) == 0)
return;
// Rasterize
dst = &stash->texData[gx + gy * stash->params.width];
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++)
dst[x] = 0xff;
dst += stash->params.width;
}
stash->dirtyRect[0] = fons__mini(stash->dirtyRect[0], gx);
stash->dirtyRect[1] = fons__mini(stash->dirtyRect[1], gy);
stash->dirtyRect[2] = fons__maxi(stash->dirtyRect[2], gx+w);
stash->dirtyRect[3] = fons__maxi(stash->dirtyRect[3], gy+h);
}
struct FONScontext* fonsCreateInternal(struct FONSparams* params)
{
struct FONScontext* stash = NULL;
// Allocate memory for the font stash.
stash = (struct FONScontext*)malloc(sizeof(struct FONScontext));
if (stash == NULL) goto error;
memset(stash, 0, sizeof(struct FONScontext));
stash->params = *params;
// Initialize implementation library
if (!fons__tt_init(stash)) goto error;
if (stash->params.renderCreate != NULL) {
if (stash->params.renderCreate(stash->params.userPtr, stash->params.width, stash->params.height) == 0)
goto error;
}
stash->atlas = fons__allocAtlas(stash->params.width, stash->params.height, FONS_INIT_ATLAS_NODES);
if (stash->atlas == NULL) goto error;
// Allocate space for fonts.
stash->fonts = (struct FONSfont**)malloc(sizeof(struct FONSfont*) * FONS_INIT_FONTS);
if (stash->fonts == NULL) goto error;
memset(stash->fonts, 0, sizeof(struct FONSfont*) * FONS_INIT_FONTS);
stash->cfonts = FONS_INIT_FONTS;
stash->nfonts = 0;
// Create texture for the cache.
stash->itw = 1.0f/stash->params.width;
stash->ith = 1.0f/stash->params.height;
stash->texData = (unsigned char*)malloc(stash->params.width * stash->params.height);
if (stash->texData == NULL) goto error;
memset(stash->texData, 0, stash->params.width * stash->params.height);
stash->dirtyRect[0] = stash->params.width;
stash->dirtyRect[1] = stash->params.height;
stash->dirtyRect[2] = 0;
stash->dirtyRect[3] = 0;
// Add white rect at 0,0 for debug drawing.
fons__addWhiteRect(stash, 2,2);
fonsPushState(stash);
fonsClearState(stash);
return stash;
error:
fonsDeleteInternal(stash);
return NULL;
}
static struct FONSstate* fons__getState(struct FONScontext* stash)
{
return &stash->states[stash->nstates-1];
}
void fonsSetSize(struct FONScontext* stash, float size)
{
fons__getState(stash)->size = size;
}
void fonsSetColor(struct FONScontext* stash, unsigned int color)
{
fons__getState(stash)->color = color;
}
void fonsSetSpacing(struct FONScontext* stash, float spacing)
{
fons__getState(stash)->spacing = spacing;
}
void fonsSetBlur(struct FONScontext* stash, float blur)
{
fons__getState(stash)->blur = blur;
}
void fonsSetAlign(struct FONScontext* stash, int align)
{
fons__getState(stash)->align = align;
}
void fonsSetFont(struct FONScontext* stash, int font)
{
fons__getState(stash)->font = font;
}
void fonsPushState(struct FONScontext* stash)
{
if (stash->nstates >= FONS_MAX_STATES) {
if (stash->handleError)
stash->handleError(stash->errorUptr, FONS_STATES_OVERFLOW, 0);
return;
}
if (stash->nstates > 0)
memcpy(&stash->states[stash->nstates], &stash->states[stash->nstates-1], sizeof(struct FONSstate));
stash->nstates++;
}
void fonsPopState(struct FONScontext* stash)
{
if (stash->nstates <= 1) {
if (stash->handleError)
stash->handleError(stash->errorUptr, FONS_STATES_UNDERFLOW, 0);
return;
}
stash->nstates--;
}
void fonsClearState(struct FONScontext* stash)
{
struct FONSstate* state = fons__getState(stash);
state->size = 12.0f;
state->color = 0xffffffff;
state->font = 0;
state->blur = 0;
state->spacing = 0;
state->align = FONS_ALIGN_LEFT | FONS_ALIGN_BASELINE;
}
static void fons__freeFont(struct FONSfont* font)
{
if (font == NULL) return;
if (font->glyphs) free(font->glyphs);
if (font->freeData && font->data) free(font->data);
free(font);
}
static int fons__allocFont(struct FONScontext* stash)
{
struct FONSfont* font = NULL;
if (stash->nfonts+1 > stash->cfonts) {
stash->cfonts = stash->cfonts == 0 ? 8 : stash->cfonts * 2;
stash->fonts = (struct FONSfont**)realloc(stash->fonts, sizeof(struct FONSfont*) * stash->cfonts);
if (stash->fonts == NULL)
return -1;
}
font = (struct FONSfont*)malloc(sizeof(struct FONSfont));
if (font == NULL) goto error;
memset(font, 0, sizeof(struct FONSfont));
font->glyphs = (struct FONSglyph*)malloc(sizeof(struct FONSglyph) * FONS_INIT_GLYPHS);
if (font->glyphs == NULL) goto error;
font->cglyphs = FONS_INIT_GLYPHS;
font->nglyphs = 0;
stash->fonts[stash->nfonts++] = font;
return stash->nfonts-1;
error:
fons__freeFont(font);
return FONS_INVALID;
}
int fonsAddFont(struct FONScontext* stash, const char* name, const char* path)
{
FILE* fp = 0;
int dataSize = 0;
unsigned char* data = NULL;
// Read in the font data.
fp = fopen(path, "rb");
if (!fp) goto error;
fseek(fp,0,SEEK_END);
dataSize = (int)ftell(fp);
fseek(fp,0,SEEK_SET);
data = (unsigned char*)malloc(dataSize);
if (data == NULL) goto error;
fread(data, 1, dataSize, fp);
fclose(fp);
fp = 0;
return fonsAddFontMem(stash, name, data, dataSize, 1);
error:
if (data) free(data);
if (fp) fclose(fp);
return FONS_INVALID;
}
int fonsAddFontMem(struct FONScontext* stash, const char* name, unsigned char* data, int dataSize, int freeData)
{
int i, ascent, descent, fh, lineGap;
struct FONSfont* font;
int idx = fons__allocFont(stash);
if (idx == FONS_INVALID)
return FONS_INVALID;
font = stash->fonts[idx];
strncpy(font->name, name, sizeof(font->name));
font->name[sizeof(font->name)-1] = '\0';
// Init hash lookup.
for (i = 0; i < FONS_HASH_LUT_SIZE; ++i)
font->lut[i] = -1;
// Read in the font data.
font->dataSize = dataSize;
font->data = data;
font->freeData = (unsigned char)freeData;
// Init font
stash->nscratch = 0;
if (!fons__tt_loadFont(stash, &font->font, data, dataSize)) goto error;
// Store normalized line height. The real line height is got
// by multiplying the lineh by font size.
fons__tt_getFontVMetrics( &font->font, &ascent, &descent, &lineGap);
fh = ascent - descent;
font->ascender = (float)ascent / (float)fh;
font->descender = (float)descent / (float)fh;
font->lineh = (float)(fh + lineGap) / (float)fh;
return idx;
error:
fons__freeFont(font);
stash->nfonts--;
return FONS_INVALID;
}
int fonsGetFontByName(struct FONScontext* s, const char* name)
{
int i;
for (i = 0; i < s->nfonts; i++) {
if (strcmp(s->fonts[i]->name, name) == 0)
return i;
}
return FONS_INVALID;
}
static struct FONSglyph* fons__allocGlyph(struct FONSfont* font)
{
if (font->nglyphs+1 > font->cglyphs) {
font->cglyphs = font->cglyphs == 0 ? 8 : font->cglyphs * 2;
font->glyphs = (struct FONSglyph*)realloc(font->glyphs, sizeof(struct FONSglyph) * font->cglyphs);
if (font->glyphs == NULL) return NULL;
}
font->nglyphs++;
return &font->glyphs[font->nglyphs-1];
}
// Based on Exponential blur, Jani Huhtanen, 2006
#define APREC 16
#define ZPREC 7
static void fons__blurCols(unsigned char* dst, int w, int h, int dstStride, int alpha)
{
int x, y;
for (y = 0; y < h; y++) {
int z = 0; // force zero border
for (x = 1; x < w; x++) {
z += (alpha * (((int)(dst[x]) << ZPREC) - z)) >> APREC;
dst[x] = (unsigned char)(z >> ZPREC);
}
dst[w-1] = 0; // force zero border
z = 0;
for (x = w-2; x >= 0; x--) {
z += (alpha * (((int)(dst[x]) << ZPREC) - z)) >> APREC;
dst[x] = (unsigned char)(z >> ZPREC);
}
dst[0] = 0; // force zero border
dst += dstStride;
}
}
static void fons__blurRows(unsigned char* dst, int w, int h, int dstStride, int alpha)
{
int x, y;
for (x = 0; x < w; x++) {
int z = 0; // force zero border
for (y = dstStride; y < h*dstStride; y += dstStride) {
z += (alpha * (((int)(dst[y]) << ZPREC) - z)) >> APREC;
dst[y] = (unsigned char)(z >> ZPREC);
}
dst[(h-1)*dstStride] = 0; // force zero border
z = 0;
for (y = (h-2)*dstStride; y >= 0; y -= dstStride) {
z += (alpha * (((int)(dst[y]) << ZPREC) - z)) >> APREC;
dst[y] = (unsigned char)(z >> ZPREC);
}
dst[0] = 0; // force zero border
dst++;
}
}
static void fons__blur(struct FONScontext* stash, unsigned char* dst, int w, int h, int dstStride, int blur)
{
int alpha;
float sigma;
(void)stash;
if (blur < 1)
return;
// Calculate the alpha such that 90% of the kernel is within the radius. (Kernel extends to infinity)
sigma = (float)blur * 0.57735f; // 1 / sqrt(3)
alpha = (int)((1<<APREC) * (1.0f - expf(-2.3f / (sigma+1.0f))));
fons__blurRows(dst, w, h, dstStride, alpha);
fons__blurCols(dst, w, h, dstStride, alpha);
fons__blurRows(dst, w, h, dstStride, alpha);
fons__blurCols(dst, w, h, dstStride, alpha);
// fons__blurrows(dst, w, h, dstStride, alpha);
// fons__blurcols(dst, w, h, dstStride, alpha);
}
static struct FONSglyph* fons__getGlyph(struct FONScontext* stash, struct FONSfont* font, unsigned int codepoint,
short isize, short iblur)
{
int i, g, advance, lsb, x0, y0, x1, y1, gw, gh, gx, gy, x, y;
float scale;
struct FONSglyph* glyph = NULL;
unsigned int h;
float size = isize/10.0f;
int pad;
unsigned char* bdst;
unsigned char* dst;
if (isize < 2) return NULL;
if (iblur > 20) iblur = 20;
pad = iblur+2;
// Reset allocator.
stash->nscratch = 0;
// Find code point and size.
h = fons__hashint(codepoint) & (FONS_HASH_LUT_SIZE-1);
i = font->lut[h];
while (i != -1) {
if (font->glyphs[i].codepoint == codepoint && font->glyphs[i].size == isize && font->glyphs[i].blur == iblur)
return &font->glyphs[i];
i = font->glyphs[i].next;