cudaFont.h

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/*
 * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
 *
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 * The above copyright notice and this permission notice shall be included in
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#ifndef __CUDA_FONT_H__
#define __CUDA_FONT_H__

#include "cudaUtility.h"

#include <string>
#include <vector>


float adaptFontSize( uint32_t dimension );


class cudaFont
{
public:
        static cudaFont* Create( float size=32.0f );

        static cudaFont* Create( const char* font, float size );
        
        static cudaFont* Create( const std::vector<std::string>& fonts, float size );

        ~cudaFont();
        
        bool OverlayText( float4* image, uint32_t width, uint32_t height, 
                                const char* str, int x, int y, 
                                   const float4& color=make_float4(0, 0, 0, 255),
                                   const float4& background=make_float4(0, 0, 0, 0),
                                   int backgroundPadding=5 );
                                                
        bool OverlayText( float4* image, uint32_t width, uint32_t height, 
                                const std::vector< std::pair< std::string, int2 > >& text,
                                const float4& color=make_float4(0, 0, 0, 255),
                                   const float4& background=make_float4(0, 0, 0, 0),
                                   int backgroundPadding=5 );
        
protected:
        cudaFont();
        bool init( const char* font, float size );

        uint8_t* mFontMapCPU;
        uint8_t* mFontMapGPU;
        
        int mFontMapWidth;
        int mFontMapHeight;
        
        void* mCommandCPU;
        void* mCommandGPU;
        int   mCmdIndex;

        float4* mRectsCPU;
        float4* mRectsGPU;
        int     mRectIndex;

        static const uint32_t MaxCommands = 1024;
        static const uint32_t FirstGlyph  = 32;
        static const uint32_t LastGlyph   = 255;
        static const uint32_t NumGlyphs   = LastGlyph - FirstGlyph;

        struct GlyphInfo
        {
                uint16_t x;
                uint16_t y;
                uint16_t width;
                uint16_t height;

                float xAdvance;
                float xOffset;
                float yOffset;
        } mGlyphInfo[NumGlyphs];
};

#endif