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Removed the glyph image outline support as it's no longer required.

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This commit is contained in:
Robert Osfield 2017-10-13 13:01:57 +01:00
parent 8b12d2d71a
commit 24bec09b9e
3 changed files with 4 additions and 82 deletions
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1
examples/osgfont/osgfont.cpp
View File

@ -103,7 +103,6 @@ struct TextSettings
}
if (arguments.read("--GREYSCALE")) { glyphTextureFeatures = osgText::GlyphTexture::GREYSCALE; }
if (arguments.read("--OUTLINE_GREYSCALE")) { glyphTextureFeatures = osgText::GlyphTexture::OUTLINE_GREYSCALE; }
if (arguments.read("--SIGNED_DISTANCE_FIELD")) { glyphTextureFeatures = osgText::GlyphTexture::SIGNED_DISTANCE_FIELD; }
if (arguments.read("--ALL_FEATURES")) { glyphTextureFeatures = osgText::GlyphTexture::ALL_FEATURES; }

1
include/osgText/Glyph
View File

@ -263,7 +263,6 @@ public:
enum Features
{
GREYSCALE,
OUTLINE_GREYSCALE,
SIGNED_DISTANCE_FIELD,
ALL_FEATURES
};

84
src/osgText/Glyph.cpp
View File

@ -32,7 +32,7 @@ using namespace std;
#define TEXTURE_IMAGE_NUM_CHANNELS 1
#define TEXTURE_IMAGE_FORMAT OSGTEXT_GLYPH_FORMAT
#else
#define TEXTURE_IMAGE_NUM_CHANNELS 4
#define TEXTURE_IMAGE_NUM_CHANNELS 2
#define TEXTURE_IMAGE_FORMAT GL_RGBA
#endif
@ -60,9 +60,7 @@ int GlyphTexture::compare(const osg::StateAttribute& rhs) const
int GlyphTexture::getEffectMargin(const Glyph* glyph)
{
if (_glyphTextureFeatures==GREYSCALE) return 0;
// else return glyph->getFontResolution().second/4;
else return osg::maximum(glyph->getFontResolution().second/6, 2u);
// else return osg::maximum(glyph->getFontResolution().second/8,1u);
}
int GlyphTexture::getTexelMargin(const Glyph* glyph)
@ -195,10 +193,6 @@ void GlyphTexture::copyGlyphImage(Glyph* glyph)
if ((lower+glyph->getTexturePositionY())<0) lower = -glyph->getTexturePositionY();
if ((upper+glyph->getTexturePositionY())>=dest_rows) upper = dest_rows-glyph->getTexturePositionY()-1;
bool use_SDF_for_Outline = true;
float outer_outline_distance = float(glyph->getFontResolution().first)*0.1f;
float inner_outline_distance = outer_outline_distance*0.5f;
unsigned char full_on = 255;
unsigned char mid_point = full_on/2;
@ -213,17 +207,11 @@ void GlyphTexture::copyGlyphImage(Glyph* glyph)
unsigned char center_value = 0;
if (dr>=0 && dr<src_rows && dc>=0 && dc<src_columns) center_value = *(src_data + dr*src_columns + dc);
unsigned char inner_max_value = center_value;
unsigned char outer_max_value = center_value;
float center_value_f = center_value*multiplier;
float min_distance = max_distance;
if (center_value>0 && center_value<full_on)
{
inner_max_value = 255;
outer_max_value = 255;
if (center_value_f>=mid_point_f)
{
min_distance = center_value_f-mid_point_f;
@ -263,9 +251,6 @@ void GlyphTexture::copyGlyphImage(Glyph* glyph)
else local_distance += (local_value_f - mid_point_f)*local_multiplier;
if (local_distance<min_distance) min_distance = local_distance;
if (local_value>inner_max_value && local_distance<=inner_outline_distance) inner_max_value = local_value;
if (local_value>outer_max_value && local_distance<=outer_outline_distance) outer_max_value = local_value;
}
}
@ -291,9 +276,6 @@ void GlyphTexture::copyGlyphImage(Glyph* glyph)
else local_distance += (local_value_f - mid_point_f)*local_multiplier;
if (local_distance<min_distance) min_distance = local_distance;
if (local_value>inner_max_value && local_distance<=inner_outline_distance) inner_max_value = local_value;
if (local_value>outer_max_value && local_distance<=outer_outline_distance) outer_max_value = local_value;
}
}
@ -320,9 +302,6 @@ void GlyphTexture::copyGlyphImage(Glyph* glyph)
else local_distance += (local_value_f - mid_point_f)*local_multiplier;
if (local_distance<min_distance) min_distance = local_distance;
if (local_value>inner_max_value && local_distance<=inner_outline_distance) inner_max_value = local_value;
if (local_value>outer_max_value && local_distance<=outer_outline_distance) outer_max_value = local_value;
}
}
@ -348,9 +327,6 @@ void GlyphTexture::copyGlyphImage(Glyph* glyph)
else local_distance += (local_value_f - mid_point_f)*local_multiplier;
if (local_distance<min_distance) min_distance = local_distance;
if (local_value>inner_max_value && local_distance<=inner_outline_distance) inner_max_value = local_value;
if (local_value>outer_max_value && local_distance<=outer_outline_distance) outer_max_value = local_value;
}
}
}
@ -368,63 +344,11 @@ void GlyphTexture::copyGlyphImage(Glyph* glyph)
unsigned char* dest_ptr = dest_data + (dr*dest_columns + dc)*num_channels;
if (num_channels==4)
if (num_channels==2)
{
// signed distance field value
*(dest_ptr++) = value;
float outline_distance = inner_outline_distance;
// compute the alpha value of outline, one texel thick
unsigned char outline = 0;
if (use_SDF_for_Outline)
{
if (center_value<255)
{
float inner_outline = outline_distance-1.0f;
if (min_distance<inner_outline) outline = 255;
else if (min_distance<=outline_distance) outline = (unsigned char)(255.0*(outline_distance-min_distance)/(outline_distance-inner_outline));
else outline = 0;
}
if (outline>center_value)
{
outline -= center_value;
}
}
else
{
outline = inner_max_value-center_value;
}
*(dest_ptr++) = outline;
outline_distance = outer_outline_distance;
// compute the alpha value of outline, one texel thick
outline = 0;
if (use_SDF_for_Outline)
{
if (center_value<255)
{
float inner_outline = outline_distance-1.0f;
if (min_distance<inner_outline) outline = 255;
else if (min_distance<=outline_distance) outline = (unsigned char)(255.0*(outline_distance-min_distance)/(outline_distance-inner_outline));
else outline = 0;
}
if (outline>center_value)
{
outline -= center_value;
}
}
else
{
outline = outer_max_value-center_value;
}
*(dest_ptr++) = outline;
// original alpha value from glyph image
*(dest_ptr) = center_value;
}
@ -468,9 +392,9 @@ osg::Image* GlyphTexture::createImage()
_image = new osg::Image;
#if defined(OSG_GL3_AVAILABLE) && !defined(OSG_GL2_AVAILABLE) && !defined(OSG_GL1_AVAILABLE)
GLenum imageFormat = (_glyphTextureFeatures==GREYSCALE) ? GL_RED : GL_RGBA;
GLenum imageFormat = (_glyphTextureFeatures==GREYSCALE) ? GL_RED : GL_RG;
#else
GLenum imageFormat = (_glyphTextureFeatures==GREYSCALE) ? GL_ALPHA : GL_RGBA;
GLenum imageFormat = (_glyphTextureFeatures==GREYSCALE) ? GL_ALPHA : GL_LUMINANCE_ALPHA;
#endif
_image->allocateImage(getTextureWidth(), getTextureHeight(), 1, imageFormat, GL_UNSIGNED_BYTE);