156 lines
3.7 KiB
C++
156 lines
3.7 KiB
C++
// Copyright (C) 2007 Id Software, Inc.
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//
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#ifndef __DEVICECONTEXTHELPER_H__
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#define __DEVICECONTEXTHELPER_H__
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class sdTextDimensionHelper {
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public:
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sdTextDimensionHelper( void );
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~sdTextDimensionHelper( void );
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void Init( const wchar_t* text, const int textLength, const sdBounds2D& rect, unsigned int flags, const qhandle_t font, const int pointSize, idList< int >* lineBreaks = NULL );
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int GetAdvance( const int index ) const;
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float GetWidth( const int startIndex, const int endIndex ) const;
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int GetTextWidth() const { return width; }
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int GetTextHeight() const { return height; }
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int GetLineHeight() const { return lineHeight; }
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int ToVirtualScreenSize( const int size ) const;
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float ToVirtualScreenSizeFloat( const int size ) const;
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private:
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static const int BASE_BUFFER = 256;
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float scale;
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int width;
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int height;
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int lineHeight;
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int* advances;
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int advancesBase[ BASE_BUFFER ];
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int textLength;
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};
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/*
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============
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sdTextDimensionHelper::sdTextDimensionHelper
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============
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*/
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ID_INLINE sdTextDimensionHelper::sdTextDimensionHelper( void ) :
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scale( 1.0f ),
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width( 0 ),
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height( 0 ),
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lineHeight( 0 ),
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advances( &advancesBase[ 0 ] ),
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textLength( 0 ) {
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}
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/*
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============
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sdTextDimensionHelper::~sdTextDimensionHelper
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============
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*/
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ID_INLINE sdTextDimensionHelper::~sdTextDimensionHelper( void ) {
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if( advances != &advancesBase[ 0 ] ) {
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Mem_Free( advances );
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}
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}
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/*
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============
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sdTextDimensionHelper::Init
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============
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*/
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ID_INLINE void sdTextDimensionHelper::Init( const wchar_t* text, const int textLength, const sdBounds2D& rect, unsigned int flags, const qhandle_t font, const int pointSize, idList< int >* lineBreaks ) {
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if( lineBreaks != NULL ) {
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lineBreaks->SetNum( 0, false );
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}
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if ( textLength == 0 ) {
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memset( advances, 0, this->textLength * sizeof( int ) );
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this->textLength = 0;
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return;
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}
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if( advances != NULL && textLength > this->textLength && advances != &advancesBase[ 0 ] ) {
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Mem_Free( advances );
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advances = &advancesBase[ 0 ];
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}
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if( textLength > BASE_BUFFER ) {
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advances = static_cast< int* >( Mem_Alloc( textLength * sizeof( int ) ) );
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}
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deviceContext->GetTextDimensions( text, rect, flags, font, pointSize, width, height, &scale, &advances, lineBreaks );
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int numLines = ( lineBreaks != NULL ) ? lineBreaks->Num() : 0;
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// a trailing empty line isn't included in the total drawn height
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if( text[ textLength - 1 ] == L'\n' ) {
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numLines--;
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}
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lineHeight = idMath::Ftoi( idMath::Ceil( static_cast< float >( height ) / ( numLines + 1 ) ) );
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this->textLength = textLength;
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}
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/*
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============
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sdTextDimensionHelper::GetAdvance
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============
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*/
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ID_INLINE int sdTextDimensionHelper::GetAdvance( const int index ) const {
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if ( advances == NULL ) {
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return 0;
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}
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return advances[index];
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}
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/*
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============
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sdTextDimensionHelper::GetWidth
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============
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*/
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ID_INLINE float sdTextDimensionHelper::GetWidth( const int startIndex, const int endIndex ) const {
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if ( advances == NULL || textLength == 0 ) {
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return 0.0f;
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}
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int width = 0;
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for ( int i = startIndex; i <= endIndex && i < textLength ; i++ ) {
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width += advances[i];
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}
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return ToVirtualScreenSize( width );
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}
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/*
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============
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sdTextDimensionHelper::ToVirtualScreenSize
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============
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*/
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ID_INLINE int sdTextDimensionHelper::ToVirtualScreenSize( const int size ) const {
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return idMath::Ftoi( idMath::Ceil( ( size >> 6 ) / scale ) );
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}
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/*
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============
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sdTextDimensionHelper::ToVirtualScreenSizeFloat
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============
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*/
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ID_INLINE float sdTextDimensionHelper::ToVirtualScreenSizeFloat( const int size ) const {
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return ( size >> 6 ) / scale;
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}
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#endif /* !__DEVICECONTEXTHELPER_H__ */
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