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Split bitmap text drawing routine into smaller functions (GAL).

This commit is contained in:
Maciej Suminski 2016-05-02 16:12:18 +02:00
parent a3a9641ae2
commit 59fe8df269
2 changed files with 76 additions and 43 deletions
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103
common/gal/opengl/opengl_gal.cpp
View File

@ -694,22 +694,9 @@ void OPENGL_GAL::BitmapText( const wxString& aText, const VECTOR2D& aPosition,
{ {
wxASSERT_MSG( !IsTextMirrored(), "No support for mirrored text using bitmap fonts." ); wxASSERT_MSG( !IsTextMirrored(), "No support for mirrored text using bitmap fonts." );
const float TEX_X = bitmap_font.width;
const float TEX_Y = bitmap_font.height;
const int length = aText.length();
double cur_x = 0.0;
// Compute text size, so it can be properly justified // Compute text size, so it can be properly justified
VECTOR2D textSize( 0.0, 0.0 ); VECTOR2D textSize = computeBitmapTextSize( aText );
for( int i = 0; i < length; ++i )
{
const bitmap_glyph& glyph = bitmap_chars[aText[i]];
textSize.x += ( glyph.x_off + glyph.width );
textSize.y = std::max( (unsigned int)( textSize.y ), glyph.y_off * 2 + glyph.height );
}
const double SCALE = GetGlyphSize().y / textSize.y * 2.0; const double SCALE = GetGlyphSize().y / textSize.y * 2.0;
Save(); Save();
@ -759,9 +746,9 @@ void OPENGL_GAL::BitmapText( const wxString& aText, const VECTOR2D& aPosition,
* v2 v3 * v2 v3
*/ */
for( int i = 0; i < length; ++i ) for( unsigned int i = 0; i < aText.length(); ++i )
{ {
const unsigned long c = aText[i]; const unsigned int c = aText[i];
wxASSERT_MSG( c < bitmap_chars_count, wxT( "Missing character in bitmap font atlas." ) ); wxASSERT_MSG( c < bitmap_chars_count, wxT( "Missing character in bitmap font atlas." ) );
@ -770,38 +757,13 @@ void OPENGL_GAL::BitmapText( const wxString& aText, const VECTOR2D& aPosition,
wxASSERT_MSG( c != '\n' && c != '\r', wxT( "No support for multiline bitmap text yet" ) ); wxASSERT_MSG( c != '\n' && c != '\r', wxT( "No support for multiline bitmap text yet" ) );
const bitmap_glyph& glyph = bitmap_chars[aText[i]];
const float x = glyph.x;
const float y = glyph.y;
const float xoff = glyph.x_off;
const float yoff = glyph.y_off;
const float w = glyph.width;
const float h = glyph.height;
currentManager->Reserve( 6 );
cur_x += xoff / 2;
currentManager->Shader( SHADER_FONT, x / TEX_X, y / TEX_Y );
currentManager->Vertex( cur_x, yoff, 0 ); // v0
currentManager->Shader( SHADER_FONT, ( x + w ) / TEX_X, y / TEX_Y );
currentManager->Vertex( cur_x + w, yoff, 0 ); // v1
currentManager->Shader( SHADER_FONT, x / TEX_X, ( y + h ) / TEX_Y );
currentManager->Vertex( cur_x, yoff + h, 0 ); // v2
currentManager->Shader( SHADER_FONT, ( x + w ) / TEX_X, y / TEX_Y );
currentManager->Vertex( cur_x + w, yoff, 0 ); // v1
currentManager->Shader( SHADER_FONT, x / TEX_X, ( y + h ) / TEX_Y ); drawBitmapChar( c );
currentManager->Vertex( cur_x, yoff + h, 0 ); // v2
currentManager->Shader( SHADER_FONT, ( x + w ) / TEX_X, ( y + h ) / TEX_Y );
currentManager->Vertex( cur_x + w, yoff + h, 0 ); // v3
cur_x += w + xoff / 2;
} }
Restore(); Restore();
@ -1182,6 +1144,61 @@ void OPENGL_GAL::drawStrokedSemiCircle( const VECTOR2D& aCenterPoint, double aRa
} }
void OPENGL_GAL::drawBitmapChar( const unsigned long aChar )
{
const float TEX_X = bitmap_font.width;
const float TEX_Y = bitmap_font.height;
const bitmap_glyph& glyph = bitmap_chars[aChar];
const float x = glyph.x;
const float y = glyph.y;
const float xoff = glyph.x_off;
const float yoff = glyph.y_off;
const float w = glyph.width;
const float h = glyph.height;
currentManager->Reserve( 6 );
Translate( VECTOR2D( xoff / 2, 0 ) );
currentManager->Shader( SHADER_FONT, x / TEX_X, y / TEX_Y );
currentManager->Vertex( 0, yoff, 0 ); // v0
currentManager->Shader( SHADER_FONT, ( x + w ) / TEX_X, y / TEX_Y );
currentManager->Vertex( w, yoff, 0 ); // v1
currentManager->Shader( SHADER_FONT, x / TEX_X, ( y + h ) / TEX_Y );
currentManager->Vertex( 0, yoff + h, 0 ); // v2
currentManager->Shader( SHADER_FONT, ( x + w ) / TEX_X, y / TEX_Y );
currentManager->Vertex( w, yoff, 0 ); // v1
currentManager->Shader( SHADER_FONT, x / TEX_X, ( y + h ) / TEX_Y );
currentManager->Vertex( 0, yoff + h, 0 ); // v2
currentManager->Shader( SHADER_FONT, ( x + w ) / TEX_X, ( y + h ) / TEX_Y );
currentManager->Vertex( w, yoff + h, 0 ); // v3
Translate( VECTOR2D( w + xoff / 2, 0 ) );
}
VECTOR2D OPENGL_GAL::computeBitmapTextSize( const wxString& aText ) const
{
VECTOR2D textSize( 0, 0 );
for( unsigned int i = 0; i < aText.length(); ++i )
{
const bitmap_glyph& glyph = bitmap_chars[aText[i]];
textSize.x += ( glyph.x_off + glyph.width );
textSize.y = std::max( (unsigned int)( textSize.y ), glyph.y_off * 2 + glyph.height );
}
return textSize;
}
void OPENGL_GAL::onPaint( wxPaintEvent& WXUNUSED( aEvent ) ) void OPENGL_GAL::onPaint( wxPaintEvent& WXUNUSED( aEvent ) )
{ {
PostPaint(); PostPaint();

16
include/gal/opengl/opengl_gal.h
View File

@ -345,6 +345,22 @@ private:
*/ */
void drawStrokedSemiCircle( const VECTOR2D& aCenterPoint, double aRadius, double aAngle ); void drawStrokedSemiCircle( const VECTOR2D& aCenterPoint, double aRadius, double aAngle );
/**
* @brief Draws a single character using bitmap font.
* Its main purpose is to be used in BitmapText() function.
*
* @param aCharacter is the character to be drawn.
*/
void drawBitmapChar( const unsigned long aChar );
/**
* @brief Computes a size of text drawn using bitmap font with current text setting applied.
*
* @param aText is the text to be drawn.
* @return Text size expressed in world coordinates.
*/
VECTOR2D computeBitmapTextSize( const wxString& aText ) const;
// Event handling // Event handling
/** /**
* @brief This is the OnPaint event handler. * @brief This is the OnPaint event handler.