void Glyph::SetOutline(FT_Library& library, int outlineThickness)
{
_error = FT_Stroker_New(library, &_stroker);
if (_error)
return;
FT_Stroker_Set(_stroker, outlineThickness * 64, FT_STROKER_LINECAP_ROUND, FT_STROKER_LINEJOIN_ROUND, 0);
_error = FT_Glyph_StrokeBorder(&_glyph, _stroker, false, true);
if (_error)
return;
FT_Raster_Params params;
memset(¶ms, 0, sizeof(params));
params.target = 0;
params.flags = FT_RASTER_FLAG_DIRECT | FT_RASTER_FLAG_AA;
params.user = this;
params.gray_spans = Glyph::SpanCallback;
FT_OutlineGlyph outlineGlyph = reinterpret_cast<FT_OutlineGlyph>(_glyph);
_error = FT_Outline_Render(library, &outlineGlyph->outline, ¶ms);
if (_error)
return;
}
void Glyph::RenderSpans(FT_Library &library, FT_Outline *outline)
{
FT_Raster_Params params;
memset(¶ms, 0, sizeof(params));
params.flags = FT_RASTER_FLAG_AA | FT_RASTER_FLAG_DIRECT;
params.gray_spans = Glyph::SpanCallback;
params.user = this;
FT_Outline_Render(library, outline, ¶ms);
}
void
RenderSpans(FT_Library &library,
FT_Outline * const outline,
Spans *spans)
{
FT_Raster_Params params;
memset(¶ms, 0, sizeof(params));
params.flags = FT_RASTER_FLAG_AA | FT_RASTER_FLAG_DIRECT;
params.gray_spans = RasterCallback;
params.user = spans;
FT_Outline_Render(library, outline, ¶ms);
}
FT_EXPORT_DEF( FT_Error ) FT_Outline_Get_Bitmap( FT_Library library,
FT_Outline* outline,
FT_Bitmap *abitmap )
{
FT_Raster_Params params;
if ( !abitmap )
return FT_Err_Invalid_Argument;
/* other checks are delayed to FT_Outline_Render() */
params.target = abitmap;
params.flags = 0;
if ( abitmap->pixel_mode == ft_pixel_mode_grays )
params.flags |= ft_raster_flag_aa;
return FT_Outline_Render( library, outline, ¶ms );
}
FT_Outline_Get_Bitmap( FT_Library library,
FT_Outline* outline,
const FT_Bitmap *abitmap )
{
FT_Raster_Params params;
if ( !abitmap )
return FT_Err_Invalid_Argument;
/* other checks are delayed to FT_Outline_Render() */
params.target = abitmap;
params.flags = 0;
if ( abitmap->pixel_mode == FT_PIXEL_MODE_GRAY ||
abitmap->pixel_mode == FT_PIXEL_MODE_LCD ||
abitmap->pixel_mode == FT_PIXEL_MODE_LCD_V )
params.flags |= FT_RASTER_FLAG_AA;
return FT_Outline_Render( library, outline, ¶ms );
}
s16 fsLowLevelAPI::drawFreeTypeFont(void* image, u16 image_width, u16 image_height, //
void* font_info, u32 font_index, u16 font_size, s16 x, s16 y, const wchar_t* str)
{
FT_Face face = *(reinterpret_cast<FT_Face*>(static_cast<u32*>(font_info) + 1) + font_index);
FT_Size_RequestRec size_req;
size_req.type = FT_SIZE_REQUEST_TYPE_CELL;
size_req.width = 0;
size_req.height = font_size << 6;
size_req.horiResolution = 0;
size_req.vertResolution = 0;
if (FT_Request_Size(face, &size_req))
{
return -1;
}
if (image)
{
s32 pen_x = x;
s32 pen_y = y + static_cast<s32>(face->ascender * face->size->metrics.y_ppem / face->units_per_EM);
RasterInfo raster_info;
raster_info.image = image;
raster_info.width = image_width;
FT_Raster_Params raster_params = {};
raster_params.flags = FT_RASTER_FLAG_AA | FT_RASTER_FLAG_DIRECT | FT_RASTER_FLAG_CLIP;
raster_params.gray_spans = static_cast<FT_Raster_Span_Func>(rasterSpanFunc);
raster_params.user = &raster_info;
raster_params.clip_box.yMin = pen_y - image_height;
raster_params.clip_box.yMax = pen_y;
FT_GlyphSlot glyph_slot = face->glyph;
for ( ; *str != L'\0'; str++)
{
if (FT_Load_Char(face, *str, FT_LOAD_DEFAULT | FT_LOAD_NO_BITMAP))
{
return -1;
}
if (glyph_slot->format != FT_GLYPH_FORMAT_OUTLINE)
{
return -1;
}
raster_params.clip_box.xMin = -pen_x;
raster_params.clip_box.xMax = image_width - pen_x;
raster_info.pen_x = pen_x;
raster_info.pen_y = pen_y;
if (FT_Outline_Render(s_freetype, &glyph_slot->outline, &raster_params))
{
return -1;
}
pen_x += glyph_slot->advance.x >> 6;
}
return pen_x - x;
}
else
{
unsigned int draw_freetype_font(char** image, unsigned* image_width, unsigned* image_height, void* font_info, unsigned long font_index, size_t font_size, unsigned int x, unsigned int y, const char* cstr)
{
size_t len = strlen(cstr) + 1;
wchar_t* str = new wchar_t[len];
wmemset(str, 0, len);
utf8ToWchar(str, len, cstr);
if(!font_info)return -1;
FT_Face face = *(reinterpret_cast<FT_Face*>(font_info) + font_index);
FT_Size_RequestRec size_req;
size_req.type = FT_SIZE_REQUEST_TYPE_CELL;
size_req.width = 0;
size_req.height = font_size << 6;
size_req.horiResolution = 0;
size_req.vertResolution = 0;
if (FT_Request_Size(face, &size_req))
{
return -1;
}
if (*image)
{
unsigned int pen_x = x;
unsigned int pen_y = y + static_cast<unsigned int>(face->ascender * face->size->metrics.y_ppem / face->units_per_EM);
RasterInfo raster_info;
raster_info.image = *image;
raster_info.width = *image_width;
FT_Raster_Params raster_params = {};
raster_params.flags = FT_RASTER_FLAG_AA | FT_RASTER_FLAG_DIRECT | FT_RASTER_FLAG_CLIP;
raster_params.gray_spans = static_cast<FT_Raster_Span_Func>(rasterSpanFunc);
raster_params.user = &raster_info;
raster_params.clip_box.yMin = pen_y - *image_height;
raster_params.clip_box.yMax = pen_y;
FT_GlyphSlot glyph_slot = face->glyph;
for ( ; *str != L'\0'; str++)
{
if (FT_Load_Char(face, *str, FT_LOAD_DEFAULT | FT_LOAD_NO_BITMAP))
{
return -1;
}
if (glyph_slot->format != FT_GLYPH_FORMAT_OUTLINE)
{
return -1;
}
raster_params.clip_box.xMin = -pen_x;
raster_params.clip_box.xMax = *image_width - pen_x;
raster_info.pen_x = pen_x;
raster_info.pen_y = pen_y;
if (FT_Outline_Render(s_freetype, &glyph_slot->outline, &raster_params))
{
return -1;
}
pen_x += glyph_slot->advance.x >> 6;
}
return pen_x - x;
}
else
{
int main () {
int ptSize = 50*64;
int device_hdpi = 72;
int device_vdpi = 72;
/* Init freetype */
FT_Library ft_library;
assert(!FT_Init_FreeType(&ft_library));
/* Load our fonts */
FT_Face ft_face[NUM_EXAMPLES];
assert(!FT_New_Face(ft_library, "fonts/DejaVuSerif.ttf", 0, &ft_face[ENGLISH]));
assert(!FT_Set_Char_Size(ft_face[ENGLISH], 0, ptSize, device_hdpi, device_vdpi ));
ftfdump(ft_face[ENGLISH]); // wonderful world of encodings ...
force_ucs2_charmap(ft_face[ENGLISH]); // which we ignore.
assert(!FT_New_Face(ft_library, "fonts/amiri-0.104/amiri-regular.ttf", 0, &ft_face[ARABIC]));
assert(!FT_Set_Char_Size(ft_face[ARABIC], 0, ptSize, device_hdpi, device_vdpi ));
ftfdump(ft_face[ARABIC]);
force_ucs2_charmap(ft_face[ARABIC]);
assert(!FT_New_Face(ft_library, "fonts/fireflysung-1.3.0/fireflysung.ttf", 0, &ft_face[CHINESE]));
assert(!FT_Set_Char_Size(ft_face[CHINESE], 0, ptSize, device_hdpi, device_vdpi ));
ftfdump(ft_face[CHINESE]);
force_ucs2_charmap(ft_face[CHINESE]);
/* Get our harfbuzz font structs */
hb_font_t *hb_ft_font[NUM_EXAMPLES];
hb_ft_font[ENGLISH] = hb_ft_font_create(ft_face[ENGLISH], NULL);
hb_ft_font[ARABIC] = hb_ft_font_create(ft_face[ARABIC] , NULL);
hb_ft_font[CHINESE] = hb_ft_font_create(ft_face[CHINESE], NULL);
/** Setup our SDL window **/
int width = 800;
int height = 600;
int videoFlags = SDL_SWSURFACE | SDL_RESIZABLE | SDL_DOUBLEBUF;
int bpp = 32;
/* Initialize our SDL window */
if(SDL_Init(SDL_INIT_VIDEO) < 0) {
fprintf(stderr, "Failed to initialize SDL");
return -1;
}
SDL_WM_SetCaption("\"Simple\" SDL+FreeType+HarfBuzz Example", "\"Simple\" SDL+FreeType+HarfBuzz Example");
SDL_Surface *screen;
screen = SDL_SetVideoMode(width, height, bpp, videoFlags);
/* Enable key repeat, just makes it so we don't have to worry about fancy
* scanboard keyboard input and such */
SDL_EnableKeyRepeat(300, 130);
SDL_EnableUNICODE(1);
/* Create an SDL image surface we can draw to */
SDL_Surface *sdl_surface = SDL_CreateRGBSurface (0, width, height, 32, 0,0,0,0);
/* Create a buffer for harfbuzz to use */
hb_buffer_t *buf = hb_buffer_create();
/* Our main event/draw loop */
int done = 0;
int resized = 1;
while (!done) {
/* Clear our surface */
SDL_FillRect( sdl_surface, NULL, 0 );
SDL_LockSurface(sdl_surface);
for (int i=0; i < NUM_EXAMPLES; ++i) {
hb_buffer_set_direction(buf, text_directions[i]); /* or LTR */
hb_buffer_set_script(buf, scripts[i]); /* see hb-unicode.h */
hb_buffer_set_language(buf, hb_language_from_string(languages[i], strlen(languages[i])));
/* Layout the text */
hb_buffer_add_utf8(buf, texts[i], strlen(texts[i]), 0, strlen(texts[i]));
hb_shape(hb_ft_font[i], buf, NULL, 0);
unsigned int glyph_count;
hb_glyph_info_t *glyph_info = hb_buffer_get_glyph_infos(buf, &glyph_count);
hb_glyph_position_t *glyph_pos = hb_buffer_get_glyph_positions(buf, &glyph_count);
/* set up rendering via spanners */
spanner_baton_t stuffbaton;
FT_Raster_Params ftr_params;
ftr_params.target = 0;
ftr_params.flags = FT_RASTER_FLAG_DIRECT | FT_RASTER_FLAG_AA;
ftr_params.user = &stuffbaton;
ftr_params.black_spans = 0;
ftr_params.bit_set = 0;
ftr_params.bit_test = 0;
/* Calculate string bounding box in pixels */
ftr_params.gray_spans = spanner_sizer;
/* See http://www.freetype.org/freetype2/docs/glyphs/glyphs-3.html */
int max_x = INT_MIN; // largest coordinate a pixel has been set at, or the pen was advanced to.
int min_x = INT_MAX; // smallest coordinate a pixel has been set at, or the pen was advanced to.
int max_y = INT_MIN; // this is max topside bearing along the string.
int min_y = INT_MAX; // this is max value of (height - topbearing) along the string.
/* Naturally, the above comments swap their meaning between horizontal and vertical scripts,
since the pen changes the axis it is advanced along.
However, their differences still make up the bounding box for the string.
Also note that all this is in FT coordinate system where y axis points upwards.
*/
int sizer_x = 0;
int sizer_y = 0; /* in FT coordinate system. */
FT_Error fterr;
for (unsigned j = 0; j < glyph_count; ++j) {
if ((fterr = FT_Load_Glyph(ft_face[i], glyph_info[j].codepoint, 0))) {
printf("load %08x failed fterr=%d.\n", glyph_info[j].codepoint, fterr);
} else {
if (ft_face[i]->glyph->format != FT_GLYPH_FORMAT_OUTLINE) {
printf("glyph->format = %4s\n", (char *)&ft_face[i]->glyph->format);
} else {
int gx = sizer_x + (glyph_pos[j].x_offset/64);
int gy = sizer_y + (glyph_pos[j].y_offset/64); // note how the sign differs from the rendering pass
stuffbaton.min_span_x = INT_MAX;
stuffbaton.max_span_x = INT_MIN;
stuffbaton.min_y = INT_MAX;
stuffbaton.max_y = INT_MIN;
if ((fterr = FT_Outline_Render(ft_library, &ft_face[i]->glyph->outline, &ftr_params)))
printf("FT_Outline_Render() failed err=%d\n", fterr);
if (stuffbaton.min_span_x != INT_MAX) {
/* Update values if the spanner was actually called. */
if (min_x > stuffbaton.min_span_x + gx)
min_x = stuffbaton.min_span_x + gx;
if (max_x < stuffbaton.max_span_x + gx)
max_x = stuffbaton.max_span_x + gx;
if (min_y > stuffbaton.min_y + gy)
min_y = stuffbaton.min_y + gy;
if (max_y < stuffbaton.max_y + gy)
max_y = stuffbaton.max_y + gy;
} else {
/* The spanner wasn't called at all - an empty glyph, like space. */
if (min_x > gx) min_x = gx;
if (max_x < gx) max_x = gx;
if (min_y > gy) min_y = gy;
if (max_y < gy) max_y = gy;
}
}
}
sizer_x += glyph_pos[j].x_advance/64;
sizer_y += glyph_pos[j].y_advance/64; // note how the sign differs from the rendering pass
}
/* Still have to take into account last glyph's advance. Or not? */
if (min_x > sizer_x) min_x = sizer_x;
if (max_x < sizer_x) max_x = sizer_x;
if (min_y > sizer_y) min_y = sizer_y;
if (max_y < sizer_y) max_y = sizer_y;
/* The bounding box */
int bbox_w = max_x - min_x;
int bbox_h = max_y - min_y;
/* Two offsets below position the bounding box with respect to the 'origin',
which is sort of origin of string's first glyph.
baseline_offset - offset perpendecular to the baseline to the topmost (horizontal),
or leftmost (vertical) pixel drawn.
baseline_shift - offset along the baseline, from the first drawn glyph's origin
to the leftmost (horizontal), or topmost (vertical) pixel drawn.
Thus those offsets allow positioning the bounding box to fit the rendered string,
as they are in fact offsets from the point given to the renderer, to the top left
corner of the bounding box.
NB: baseline is defined as y==0 for horizontal and x==0 for vertical scripts.
(0,0) here is where the first glyph's origin ended up after shaping, not taking
into account glyph_pos[0].xy_offset (yeah, my head hurts too).
*/
int baseline_offset;
int baseline_shift;
if (HB_DIRECTION_IS_HORIZONTAL(hb_buffer_get_direction(buf))) {
baseline_offset = max_y;
baseline_shift = min_x;
}
if (HB_DIRECTION_IS_VERTICAL(hb_buffer_get_direction(buf))) {
baseline_offset = min_x;
baseline_shift = max_y;
}
if (resized)
printf("ex %d string min_x=%d max_x=%d min_y=%d max_y=%d bbox %dx%d boffs %d,%d\n",
i, min_x, max_x, min_y, max_y, bbox_w, bbox_h, baseline_offset, baseline_shift);
/* The pen/baseline start coordinates in window coordinate system
- with those text placement in the window is controlled.
- note that for RTL scripts pen still goes LTR */
int x = 0, y = 50 + i * 75;
if (i == ENGLISH) { x = 20; } /* left justify */
if (i == ARABIC) { x = width - bbox_w - 20; } /* right justify */
if (i == CHINESE) { x = width/2 - bbox_w/2; } /* center, and for TTB script h_advance is half-width. */
/* Draw baseline and the bounding box */
/* The below is complicated since we simultaneously
convert to the window coordinate system. */
int left, right, top, bottom;
if (HB_DIRECTION_IS_HORIZONTAL(hb_buffer_get_direction(buf))) {
/* bounding box in window coordinates without offsets */
left = x;
right = x + bbox_w;
top = y - bbox_h;
bottom = y;
/* apply offsets */
left += baseline_shift;
right += baseline_shift;
top -= baseline_offset - bbox_h;
bottom -= baseline_offset - bbox_h;
/* draw the baseline */
hline(sdl_surface, x, x + bbox_w, y, 0x0000ff00);
}
if (HB_DIRECTION_IS_VERTICAL(hb_buffer_get_direction(buf))) {
left = x;
right = x + bbox_w;
top = y;
bottom = y + bbox_h;
left += baseline_offset;
right += baseline_offset;
top -= baseline_shift;
bottom -= baseline_shift;
vline(sdl_surface, y, y + bbox_h, x, 0x0000ff00);
}
if (resized)
printf("ex %d origin %d,%d bbox l=%d r=%d t=%d b=%d\n",
i, x, y, left, right, top, bottom);
/* +1/-1 are for the bbox borders be the next pixel outside the bbox itself */
hline(sdl_surface, left - 1, right + 1, top - 1, 0x00ff0000);
hline(sdl_surface, left - 1, right + 1, bottom + 1, 0x00ff0000);
vline(sdl_surface, top - 1, bottom + 1, left - 1, 0x00ff0000);
vline(sdl_surface, top - 1, bottom + 1, right + 1, 0x00ff0000);
/* set rendering spanner */
ftr_params.gray_spans = spanner;
/* initialize rendering part of the baton */
stuffbaton.pixels = NULL;
stuffbaton.first_pixel = sdl_surface->pixels;
stuffbaton.last_pixel = (uint32_t *) (((uint8_t *) sdl_surface->pixels) + sdl_surface->pitch*sdl_surface->h);
stuffbaton.pitch = sdl_surface->pitch;
stuffbaton.rshift = sdl_surface->format->Rshift;
stuffbaton.gshift = sdl_surface->format->Gshift;
stuffbaton.bshift = sdl_surface->format->Bshift;
/* render */
for (unsigned j=0; j < glyph_count; ++j) {
if ((fterr = FT_Load_Glyph(ft_face[i], glyph_info[j].codepoint, 0))) {
printf("load %08x failed fterr=%d.\n", glyph_info[j].codepoint, fterr);
} else {
if (ft_face[i]->glyph->format != FT_GLYPH_FORMAT_OUTLINE) {
printf("glyph->format = %4s\n", (char *)&ft_face[i]->glyph->format);
} else {
int gx = x + (glyph_pos[j].x_offset/64);
int gy = y - (glyph_pos[j].y_offset/64);
stuffbaton.pixels = (uint32_t *)(((uint8_t *) sdl_surface->pixels) + gy * sdl_surface->pitch) + gx;
if ((fterr = FT_Outline_Render(ft_library, &ft_face[i]->glyph->outline, &ftr_params)))
printf("FT_Outline_Render() failed err=%d\n", fterr);
}
}
x += glyph_pos[j].x_advance/64;
y -= glyph_pos[j].y_advance/64;
}
/* clean up the buffer, but don't kill it just yet */
hb_buffer_clear_contents(buf);
}
SDL_UnlockSurface(sdl_surface);
/* Blit our new image to our visible screen */
SDL_BlitSurface(sdl_surface, NULL, screen, NULL);
SDL_Flip(screen);
/* Handle SDL events */
SDL_Event event;
resized = resized ? !resized : resized;
while(SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_KEYDOWN:
if (event.key.keysym.sym == SDLK_ESCAPE) {
done = 1;
}
break;
case SDL_QUIT:
done = 1;
break;
case SDL_VIDEORESIZE:
resized = 1;
width = event.resize.w;
height = event.resize.h;
screen = SDL_SetVideoMode(event.resize.w, event.resize.h, bpp, videoFlags);
if (!screen) {
fprintf(stderr, "Could not get a surface after resize: %s\n", SDL_GetError( ));
exit(-1);
}
/* Recreate an SDL image surface we can draw to. */
SDL_FreeSurface(sdl_surface);
sdl_surface = SDL_CreateRGBSurface(0, width, height, 32, 0, 0 ,0, 0);
break;
}
}
SDL_Delay(150);
}
/* Cleanup */
hb_buffer_destroy(buf);
for (int i=0; i < NUM_EXAMPLES; ++i)
hb_font_destroy(hb_ft_font[i]);
FT_Done_FreeType(ft_library);
SDL_FreeSurface(sdl_surface);
SDL_Quit();
return 0;
}
