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Improve system for Font rendering, need to improve charCode -> glyphIndex mapping though

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This commit is contained in:
Joshua Granick
2015-03-12 21:26:18 -07:00
parent 347b25b41d
commit 93b20b38c0
8 changed files with 989 additions and 235 deletions
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72
project/src/ExternalInterface.cpp
View File

@@ -120,23 +120,6 @@ namespace lime {
}
value lime_font_create_images (value fontHandle, value fontSize, value glyphSet) {
#ifdef LIME_FREETYPE
ImageBuffer image;
Font *font = (Font*)(intptr_t)val_float (fontHandle);
GlyphSet glyphs = GlyphSet (glyphSet);
value data = alloc_empty_object ();
alloc_field (data, val_id ("glyphs"), font->CreateImages (val_int (fontSize), &glyphs, &image));
alloc_field (data, val_id ("image"), image.Value ());
return data;
#else
return alloc_null ();
#endif
}
void lime_font_destroy (value handle) {
Font *font = (Font*)(intptr_t)val_float (handle);
@@ -158,6 +141,18 @@ namespace lime {
}
value lime_font_get_char_index (value fontHandle, value character) {
#ifdef LIME_FREETYPE
Font *font = (Font*)(intptr_t)val_float (fontHandle);
return alloc_int (font->GetCharIndex ((char*)val_wstring (character)));
#else
return alloc_int (-1);
#endif
}
value lime_font_get_descender (value fontHandle) {
#ifdef LIME_FREETYPE
@@ -299,6 +294,44 @@ namespace lime {
}
value lime_font_render_glyph (value fontHandle, value index, value data) {
#ifdef LIME_FREETYPE
Font *font = (Font*)(intptr_t)val_float (fontHandle);
ByteArray bytes = ByteArray (data);
return alloc_bool (font->RenderGlyph (val_int (index), &bytes));
#else
return alloc_bool (false);
#endif
}
value lime_font_render_glyphs (value fontHandle, value indices, value data) {
#ifdef LIME_FREETYPE
Font *font = (Font*)(intptr_t)val_float (fontHandle);
ByteArray bytes = ByteArray (data);
return alloc_bool (font->RenderGlyphs (indices, &bytes));
#else
return alloc_bool (false);
#endif
}
value lime_font_set_size (value fontHandle, value fontSize) {
#ifdef LIME_FREETYPE
Font *font = (Font*)(intptr_t)val_float (fontHandle);
font->SetSize (val_int (fontSize));
#endif
return alloc_null ();
}
value lime_image_encode (value buffer, value type, value quality) {
ImageBuffer imageBuffer = ImageBuffer (buffer);
@@ -624,8 +657,8 @@ namespace lime {
DEFINE_PRIM (lime_application_quit, 1);
DEFINE_PRIM (lime_application_update, 1);
DEFINE_PRIM (lime_audio_load, 1);
DEFINE_PRIM (lime_font_create_images, 3);
DEFINE_PRIM (lime_font_get_ascender, 1);
DEFINE_PRIM (lime_font_get_char_index, 2);
DEFINE_PRIM (lime_font_get_descender, 1);
DEFINE_PRIM (lime_font_get_family_name, 1);
DEFINE_PRIM (lime_font_get_glyph_metrics, 2);
@@ -636,6 +669,9 @@ namespace lime {
DEFINE_PRIM (lime_font_get_units_per_em, 1);
DEFINE_PRIM (lime_font_load, 1);
DEFINE_PRIM (lime_font_outline_decompose, 2);
DEFINE_PRIM (lime_font_render_glyph, 3);
DEFINE_PRIM (lime_font_render_glyphs, 3);
DEFINE_PRIM (lime_font_set_size, 2);
DEFINE_PRIM (lime_image_encode, 3);
DEFINE_PRIM (lime_image_load, 1);
DEFINE_PRIM (lime_jni_getenv, 0);

396
project/src/text/Font.cpp
View File

@@ -17,6 +17,117 @@
#endif
// from http://stackoverflow.com/questions/2948308/how-do-i-read-utf-8-characters-via-a-pointer
#define IS_IN_RANGE(c, f, l) (((c) >= (f)) && ((c) <= (l)))
unsigned long readNextChar (char*& p)
{
// TODO: since UTF-8 is a variable-length
// encoding, you should pass in the input
// buffer's actual byte length so that you
// can determine if a malformed UTF-8
// sequence would exceed the end of the buffer...
unsigned char c1, c2, *ptr = (unsigned char*) p;
unsigned long uc = 0;
int seqlen;
c1 = ptr[0];
if ((c1 & 0x80) == 0) {
uc = (unsigned long) (c1 & 0x7F);
seqlen = 1;
} else if ((c1 & 0xE0) == 0xC0) {
uc = (unsigned long) (c1 & 0x1F);
seqlen = 2;
} else if ((c1 & 0xF0) == 0xE0) {
uc = (unsigned long) (c1 & 0x0F);
seqlen = 3;
} else if ((c1 & 0xF8) == 0xF0) {
uc = (unsigned long) (c1 & 0x07);
seqlen = 4;
} else {
// malformed data, do something !!!
return (unsigned long) -1;
}
for (int i = 1; i < seqlen; ++i) {
c1 = ptr[i];
if ((c1 & 0xC0) != 0x80) {
// malformed data, do something !!!
return (unsigned long) -1;
}
}
switch (seqlen) {
case 2:
c1 = ptr[0];
if (!IS_IN_RANGE(c1, 0xC2, 0xDF)) {
// malformed data, do something !!!
return (unsigned long) -1;
}
break;
case 3:
c1 = ptr[0];
c2 = ptr[1];
if (((c1 == 0xE0) && !IS_IN_RANGE(c2, 0xA0, 0xBF)) ||
((c1 == 0xED) && !IS_IN_RANGE(c2, 0x80, 0x9F)) ||
(!IS_IN_RANGE(c1, 0xE1, 0xEC) && !IS_IN_RANGE(c1, 0xEE, 0xEF))) {
// malformed data, do something !!!
return (unsigned long) -1;
}
break;
case 4:
c1 = ptr[0];
c2 = ptr[1];
if (((c1 == 0xF0) && !IS_IN_RANGE(c2, 0x90, 0xBF)) ||
((c1 == 0xF4) && !IS_IN_RANGE(c2, 0x80, 0x8F)) ||
!IS_IN_RANGE(c1, 0xF1, 0xF3)) {
// malformed data, do something !!!
return (unsigned long) -1;
}
break;
}
for (int i = 1; i < seqlen; ++i) {
uc = ((uc << 6) | (unsigned long)(ptr[i] & 0x3F));
}
p += seqlen;
return uc;
}
namespace {
@@ -159,14 +270,18 @@ namespace {
namespace lime {
static int id_buffer;
static int id_charCode;
static int id_codepoint;
static int id_glyphIndex;
static int id_height;
static int id_index;
static int id_horizontalAdvance;
static int id_horizontalBearingX;
static int id_horizontalBearingY;
static int id_image;
static int id_offset;
static int id_offsetX;
static int id_offsetY;
static int id_size;
static int id_verticalAdvance;
static int id_verticalBearingX;
@@ -189,11 +304,15 @@ namespace lime {
id_size = val_id ("size");
id_codepoint = val_id ("codepoint");
id_buffer = val_id ("buffer");
id_charCode = val_id ("charCode");
id_glyphIndex = val_id ("glyphIndex");
id_horizontalAdvance = val_id ("horizontalAdvance");
id_horizontalBearingX = val_id ("horizontalBearingX");
id_horizontalBearingY = val_id ("horizontalBearingY");
id_image = val_id ("image");
id_index = val_id ("index");
id_offsetX = val_id ("offsetX");
id_offsetY = val_id ("offsetY");
id_verticalAdvance = val_id ("verticalAdvance");
id_verticalBearingX = val_id ("verticalBearingX");
id_verticalBearingY = val_id ("verticalBearingY");
@@ -341,193 +460,6 @@ namespace lime {
}
value Font::CreateImages (int fontSize, GlyphSet *glyphSet, ImageBuffer *image) {
initialize ();
std::list<FT_ULong> charCodes = std::list<FT_ULong> ();
if (!glyphSet->glyphs.empty ()) {
FT_ULong charCode;
for (unsigned int i = 0; i < glyphSet->glyphs.length (); i++) {
charCodes.push_back (glyphSet->glyphs[i]);
}
}
GlyphRange range;
for (int i = 0; i < glyphSet->ranges.size (); i++) {
range = glyphSet->ranges[i];
if (range.start == 0 && range.end == -1) {
FT_UInt glyphIndex;
FT_ULong charCode = FT_Get_First_Char ((FT_Face)face, &glyphIndex);
while (glyphIndex != 0) {
charCodes.push_back (charCode);
charCode = FT_Get_Next_Char ((FT_Face)face, charCode, &glyphIndex);
}
} else {
unsigned long end = range.end;
FT_ULong charCode = range.start;
FT_UInt glyphIndex = FT_Get_Char_Index ((FT_Face)face, charCode);
while (charCode <= end || end < 0) {
if (glyphIndex > 0) {
charCodes.push_back (charCode);
}
glyphIndex = -1;
charCode = FT_Get_Next_Char ((FT_Face)face, charCode, &glyphIndex);
if (glyphIndex == 0) {
break;
}
}
}
}
charCodes.unique ();
image->Resize (128, 128, 1);
int x = 0, y = 0, maxRows = 0;
unsigned char *bytes = image->data->Bytes ();
value rects = alloc_array (charCodes.size ());
int rectsIndex = 0;
size_t hdpi = 72;
size_t vdpi = 72;
size_t hres = 100;
FT_Matrix matrix = {
(int)((1.0/hres) * 0x10000L),
(int)((0.0) * 0x10000L),
(int)((0.0) * 0x10000L),
(int)((1.0) * 0x10000L)
};
FT_Set_Char_Size ((FT_Face)face, 0, (int)(fontSize*64), (int)(hdpi * hres), vdpi);
FT_Set_Transform ((FT_Face)face, &matrix, NULL);
FT_UInt glyphIndex;
FT_ULong charCode;
for (std::list<FT_ULong>::iterator it = charCodes.begin (); it != charCodes.end (); it++) {
charCode = (*it);
glyphIndex = FT_Get_Char_Index ((FT_Face)face, charCode);
FT_Load_Glyph ((FT_Face)face, glyphIndex, FT_LOAD_FORCE_AUTOHINT | FT_LOAD_DEFAULT);
if (FT_Render_Glyph (((FT_Face)face)->glyph, FT_RENDER_MODE_NORMAL) != 0) continue;
FT_Bitmap bitmap = ((FT_Face)face)->glyph->bitmap;
if (x + bitmap.width > image->width) {
y += maxRows + 1;
x = maxRows = 0;
}
if (y + bitmap.rows > image->height) {
if (image->width < image->height) {
image->width *= 2;
} else {
image->height *= 2;
}
image->Resize (image->width, image->height, 1);
rectsIndex = 0;
it = charCodes.begin ();
it--;
x = y = maxRows = 0;
continue;
}
if (image->bpp == 1) {
image->Blit (bitmap.buffer, x, y, bitmap.width, bitmap.rows);
} else {
for (int row = 0; row < bitmap.rows; row++) {
unsigned char *out = &bytes[((row + y) * image->width + x) * image->bpp];
const unsigned char *line = &bitmap.buffer[row * bitmap.width]; // scanline
const unsigned char *const end = line + bitmap.width;
while (line != end) {
*out++ = 0xFF;
*out++ = 0xFF;
*out++ = 0xFF;
*out++ = *line;
line++;
}
}
}
value v = alloc_empty_object ();
alloc_field (v, id_x, alloc_int (x));
alloc_field (v, id_y, alloc_int (y));
alloc_field (v, id_width, alloc_int (bitmap.width));
alloc_field (v, id_height, alloc_int (bitmap.rows));
value offset = alloc_empty_object ();
alloc_field (offset, id_x, alloc_int (((FT_Face)face)->glyph->bitmap_left));
alloc_field (offset, id_y, alloc_int (((FT_Face)face)->glyph->bitmap_top));
alloc_field (v, id_offset, offset);
alloc_field (v, id_charCode, alloc_int (charCode));
alloc_field (v, id_glyphIndex, alloc_int (glyphIndex));
//alloc_field (v, id_size, alloc_int ((*it).size));
val_array_set_i (rects, rectsIndex++, v);
x += bitmap.width + 1;
if (bitmap.rows > maxRows) {
maxRows = bitmap.rows;
}
}
return rects;
}
value Font::Decompose (int em) {
int result, i, j;
@@ -699,6 +631,15 @@ namespace lime {
}
int Font::GetCharIndex (char* character) {
long charCode = readNextChar (character);
return FT_Get_Char_Index ((FT_Face)face, charCode);
}
int Font::GetDescender () {
return ((FT_Face)face)->descender;
@@ -768,7 +709,7 @@ namespace lime {
value metrics = alloc_empty_object ();
alloc_field (metrics, id_charCode, alloc_int (charCode));
alloc_field (metrics, id_glyphIndex, alloc_int (glyphIndex));
alloc_field (metrics, id_index, alloc_int (glyphIndex));
alloc_field (metrics, id_height, alloc_int (((FT_Face)face)->glyph->metrics.height));
alloc_field (metrics, id_horizontalBearingX, alloc_int (((FT_Face)face)->glyph->metrics.horiBearingX));
alloc_field (metrics, id_horizontalBearingY, alloc_int (((FT_Face)face)->glyph->metrics.horiBearingY));
@@ -891,6 +832,81 @@ namespace lime {
}
int Font::RenderGlyph (int index, ByteArray *bytes, int offset) {
FT_Load_Glyph ((FT_Face)face, index, FT_LOAD_FORCE_AUTOHINT | FT_LOAD_DEFAULT);
if (FT_Render_Glyph (((FT_Face)face)->glyph, FT_RENDER_MODE_NORMAL) == 0) {
FT_Bitmap bitmap = ((FT_Face)face)->glyph->bitmap;
int height = bitmap.rows;
int width = bitmap.width;
int pitch = bitmap.pitch;
if (width == 0 || height == 0) return 0;
uint32_t size = (4 * 5) + (width * height);
if (bytes->Size() < size + offset) {
bytes->Resize (size + offset);
}
GlyphImage *data = (GlyphImage*)(bytes->Bytes () + offset);
data->index = index;
data->width = width;
data->height = height;
data->x = ((FT_Face)face)->glyph->bitmap_left;
data->y = ((FT_Face)face)->glyph->bitmap_top;
unsigned char* position = &data->data;
for (int i = 0; i < height; i++) {
memcpy (position + (i * width), bitmap.buffer + (i * pitch), width);
}
return size;
}
return 0;
}
int Font::RenderGlyphs (value indices, ByteArray *bytes) {
int offset = 0;
int totalOffset = 4;
uint32_t count = 0;
int numIndices = val_array_size (indices);
for (int i = 0; i < numIndices; i++) {
offset = RenderGlyph (val_int (val_array_i (indices, i)), bytes, totalOffset);
if (offset > 0) {
totalOffset += offset;
count++;
}
}
*(bytes->Bytes ()) = count;
return totalOffset;
}
void Font::SetSize (size_t size) {
size_t hdpi = 72;