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update font code along with the changes done in the msdf atlas tool (use codepoint spans and refined char placement) 

add font coordinate system clarification drawing (svg)
This commit is contained in:
decimad 2016-10-20 14:29:51 +02:00
parent d9a8aac96c
commit 402f53a302
5 changed files with 2060 additions and 65603 deletions
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66862
common/gal/opengl/bitmap_font_desc.c
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2
common/gal/opengl/bitmap_font_img.c
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650
common/gal/opengl/font-specification.svg Normal file
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142
common/gal/opengl/opengl_gal.cpp
View File

@ -47,6 +47,7 @@ using namespace KIGFX;
// The current font is "Ubuntu Mono" available under Ubuntu Font Licence 1.0
// (see ubuntu-font-licence-1.0.txt for details)
#define BITMAP_FONT_USE_SPANS
#include "bitmap_font_img.c"
#include "bitmap_font_desc.c"
@ -274,8 +275,8 @@ void OPENGL_GAL::BeginDrawing()
glActiveTexture( GL_TEXTURE0 + FONT_TEXTURE_UNIT );
glGenTextures( 1, &fontTexture );
glBindTexture( GL_TEXTURE_2D, fontTexture );
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB8, bitmap_font.width, bitmap_font.height,
0, GL_RGB, GL_UNSIGNED_BYTE, bitmap_font.pixels );
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB8, font_image.width, font_image.height,
0, GL_RGB, GL_UNSIGNED_BYTE, font_image.pixels );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
checkGlError( "loading bitmap font" );
@ -748,11 +749,11 @@ void OPENGL_GAL::BitmapText( const wxString& aText, const VECTOR2D& aPosition,
{
wxASSERT_MSG( !IsTextMirrored(), "No support for mirrored text using bitmap fonts." );
// Compute text size, so it can be properly justified
std::pair<VECTOR2D, int> bbox = computeBitmapTextSize( aText );
VECTOR2D textSize = bbox.first;
int commonOffset = bbox.second;
VECTOR2D textSize;
float commonOffset;
std::tie( textSize, commonOffset ) = computeBitmapTextSize( aText );
const double SCALE = GetGlyphSize().y / textSize.y;
int tildas = 0;
bool overbar = false;
@ -801,24 +802,11 @@ void OPENGL_GAL::BitmapText( const wxString& aText, const VECTOR2D& aPosition,
break;
}
/* Glyph:
* v0 v1
* +--+
* | /|
* |/ |
* +--+
* v2 v3
*/
for( unsigned int ii = 0; ii < aText.length(); ++ii )
{
const unsigned int c = aText[ii];
wxASSERT_MSG( c < bitmap_chars_count, wxT( "Missing character in bitmap font atlas." ) );
if( c >= bitmap_chars_count )
continue;
wxASSERT_MSG( lookupGlyph(c) != nullptr, wxT( "Missing character in bitmap font atlas." ) );
wxASSERT_MSG( c != '\n' && c != '\r', wxT( "No support for multiline bitmap text yet" ) );
// Handle overbar
@ -851,6 +839,8 @@ void OPENGL_GAL::BitmapText( const wxString& aText, const VECTOR2D& aPosition,
}
// Handle the case when overbar is active till the end of the drawn text
currentManager->Translate( 0, commonOffset, 0 );
if( overbar )
drawBitmapOverbar( overbarLength, overbarHeight );
@ -863,7 +853,7 @@ void OPENGL_GAL::DrawGrid()
if( !gridVisibility )
return;
int gridScreenSizeDense = KiROUND( gridSize.x * worldScale );
int gridScreenSizeDense = KiROUND( gridSize.x * worldScale );
int gridScreenSizeCoarse = KiROUND( gridSize.x * static_cast<double>( gridTick ) * worldScale );
// Check if the grid would not be too dense
@ -1313,84 +1303,108 @@ void OPENGL_GAL::drawStrokedSemiCircle( const VECTOR2D& aCenterPoint, double aRa
int OPENGL_GAL::drawBitmapChar( unsigned long aChar )
{
const float TEX_X = bitmap_font.width;
const float TEX_Y = bitmap_font.height;
const float TEX_X = font_image.width;
const float TEX_Y = font_image.height;
const bitmap_glyph& GLYPH = bitmap_chars[aChar];
const float X = GLYPH.atlas_x;
const float Y = GLYPH.atlas_y;
const float XOFF = GLYPH.x_off;
const float YOFF = -GLYPH.miny + GLYPH.atlas_shift;
const float W = GLYPH.atlas_w;
const float H = GLYPH.atlas_h;
const float B = bitmap_font.char_border;
const bitmap_glyph* glyph = lookupGlyph(aChar);
if( !glyph ) return 0;
Translate( VECTOR2D( XOFF, 0 ) );
const float X = glyph->atlas_x + font_information.smooth_pixels;
const float Y = glyph->atlas_y + font_information.smooth_pixels;
const float XOFF = glyph->minx;
// adjust for height rounding
const float round_adjust = ( glyph->maxy - glyph->miny )
- float( glyph->atlas_h - font_information.smooth_pixels * 2 );
const float top_adjust = font_information.max_y - glyph->maxy;
const float YOFF = round_adjust + top_adjust;
const float W = glyph->atlas_w - font_information.smooth_pixels *2;
const float H = glyph->atlas_h - font_information.smooth_pixels *2;
const float B = 0;
currentManager->Reserve( 6 );
Translate( VECTOR2D( XOFF, YOFF ) );
/* Glyph:
* v0 v1
* +--+
* | /|
* |/ |
* +--+
* v2 v3
*/
currentManager->Shader( SHADER_FONT, X / TEX_X, ( Y + H ) / TEX_Y );
currentManager->Vertex( -B, YOFF - B, 0 ); // v0
currentManager->Vertex( -B, -B, 0 ); // v0
currentManager->Shader( SHADER_FONT, ( X + W ) / TEX_X, ( Y + H ) / TEX_Y );
currentManager->Vertex( W + B, YOFF - B, 0 ); // v1
currentManager->Vertex( W + B, -B, 0 ); // v1
currentManager->Shader( SHADER_FONT, X / TEX_X, Y / TEX_Y );
currentManager->Vertex( -B, YOFF + H + B, 0 ); // v2
currentManager->Vertex( -B, H + B, 0 ); // v2
currentManager->Shader( SHADER_FONT, ( X + W ) / TEX_X, ( Y + H ) / TEX_Y );
currentManager->Vertex( W + B, YOFF - B, 0 ); // v1
currentManager->Vertex( W + B, -B, 0 ); // v1
currentManager->Shader( SHADER_FONT, X / TEX_X, Y / TEX_Y );
currentManager->Vertex( -B, YOFF + H + B, 0 ); // v2
currentManager->Vertex( -B, H + B, 0 ); // v2
currentManager->Shader( SHADER_FONT, ( X + W ) / TEX_X, Y / TEX_Y );
currentManager->Vertex( W + B, YOFF + H + B, 0 ); // v3
currentManager->Vertex( W + B, H + B, 0 ); // v3
Translate( VECTOR2D( -XOFF + GLYPH.advance, 0 ) );
Translate( VECTOR2D( -XOFF + glyph->advance, -YOFF ) );
return GLYPH.advance;
return glyph->advance;
}
void OPENGL_GAL::drawBitmapOverbar( double aLength, double aHeight )
{
// To draw an overbar, simply draw an overbar
const bitmap_glyph& GLYPH = bitmap_chars[(unsigned char) '_'];
const float H = GLYPH.maxy - GLYPH.miny;
const bitmap_glyph* glyph = lookupGlyph( '_' );
const float H = glyph->maxy - glyph->miny;
Save();
Translate( VECTOR2D( -aLength, -aHeight - GLYPH.miny ) );
Translate( VECTOR2D( -aLength, -aHeight-1.5*H ) );
currentManager->Reserve( 6 );
currentManager->Color( strokeColor.r, strokeColor.g, strokeColor.b, 1 );
currentManager->Shader( 0 );
currentManager->Vertex( 0, 0, 0 ); // v0
//currentManager->Shader( 0 );
currentManager->Vertex( aLength, 0, 0 ); // v1
//currentManager->Shader( 0 );
currentManager->Vertex( 0, 0, 0 ); // v0
currentManager->Vertex( aLength, 0, 0 ); // v1
currentManager->Vertex( 0, H, 0 ); // v2
//currentManager->Shader( 0 );
currentManager->Vertex( aLength, 0, 0 ); // v1
//currentManager->Shader( 0 );
currentManager->Vertex( 0, H, 0 ); // v2
//currentManager->Shader( 0 );
currentManager->Vertex( aLength, 0, 0 ); // v1
currentManager->Vertex( 0, H, 0 ); // v2
currentManager->Vertex( aLength, H, 0 ); // v3
Restore();
}
const bitmap_glyph* OPENGL_GAL::lookupGlyph( unsigned int codepoint ) const
{
#ifdef BITMAP_FONT_USE_SPANS
auto *end = font_codepoint_spans + sizeof( font_codepoint_spans ) / sizeof( bitmap_span );
auto ptr = std::upper_bound( font_codepoint_spans, end, codepoint,
[]( unsigned int codepoint, const bitmap_span& span ) {
return codepoint < span.end;
}
);
std::pair<VECTOR2D, int> OPENGL_GAL::computeBitmapTextSize( const wxString& aText ) const
if( ptr != end && ptr->start <= codepoint ) {
unsigned int index = codepoint - ptr->start + ptr->cumulative;
return &font_codepoint_infos[index];
} else {
return nullptr;
}
#else
return &bitmap_chars[codepoint];
#endif
}
std::pair<VECTOR2D, float> OPENGL_GAL::computeBitmapTextSize( const wxString& aText ) const
{
VECTOR2D textSize( 0, 0 );
float commonOffset = std::numeric_limits<float>::max();
@ -1415,10 +1429,12 @@ std::pair<VECTOR2D, int> OPENGL_GAL::computeBitmapTextSize( const wxString& aTex
}
}
const bitmap_glyph& GLYPH = bitmap_chars[aText[i]];
textSize.x += GLYPH.advance;
textSize.y = std::max<float>( textSize.y, GLYPH.atlas_shift + GLYPH.atlas_h - GLYPH.miny );
commonOffset = std::min<float>( GLYPH.atlas_shift - GLYPH.miny, commonOffset );
const bitmap_glyph* glyph = lookupGlyph(aText[i]);
if( glyph ) {
textSize.x += glyph->advance;
textSize.y = std::max<float>( textSize.y, font_information.max_y - glyph->miny );
commonOffset = std::min<float>( font_information.max_y - glyph->maxy, commonOffset );
}
}
textSize.y -= commonOffset;
@ -1565,7 +1581,7 @@ void OPENGL_GAL::OPENGL_TEST::Render( wxPaintEvent& WXUNUSED( aEvent ) )
int maxTextureSize;
glGetIntegerv( GL_MAX_TEXTURE_SIZE, &maxTextureSize );
if( maxTextureSize < (int) bitmap_font.width || maxTextureSize < (int) bitmap_font.height )
if( maxTextureSize < (int) font_image.width || maxTextureSize < (int)font_image.height )
{
// TODO implement software texture scaling
// for bitmap fonts and use a higher resolution texture?

7
include/gal/opengl/opengl_gal.h
View File

@ -48,11 +48,12 @@
#define CALLBACK
#endif
struct bitmap_glyph;
namespace KIGFX
{
class SHADER;
/**
* @brief Class OpenGL_GAL is the OpenGL implementation of the Graphics Abstraction Layer.
*
@ -377,7 +378,9 @@ private:
* @return Pair containing text bounding box and common Y axis offset. The values are expressed
* as a number of pixels on the bitmap font texture and need to be scaled before drawing.
*/
std::pair<VECTOR2D, int> computeBitmapTextSize( const wxString& aText ) const;
std::pair<VECTOR2D, float> computeBitmapTextSize( const wxString& aText ) const;
const bitmap_glyph* lookupGlyph( unsigned int codepoint ) const;
// Event handling
/**