wagic/JGE/src/JLBFont.cpp

//-------------------------------------------------------------------------------------
//
// JGE++ is a hardware accelerated 2D game SDK for PSP/Windows.
//
// Licensed under the BSD license, see LICENSE in JGE root for details.
//
// Copyright (c) 2007 James Hui (a.k.a. Dr.Watson) <jhkhui@gmail.com>
//
//-------------------------------------------------------------------------------------



#include "../include/JLBFont.h"
#include "../include/JFileSystem.h"

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>


JRenderer* JLBFont::mRenderer = NULL;

JLBFont::JLBFont(const char *fontname, int lineheight, bool useVideoRAM)
{
    mRenderer = JRenderer::GetInstance();

    mHeight = 0;
    mScale = 1.0f;
    mRotation = mSpacing = 0.0f;
    mTracking = 0.0f;
    mColor = ARGB(255,255,255,255);

    mTexture = NULL;
    mQuad = NULL;
    mBase = 0;

    char filename[256];
    short buffer[1024];


    sprintf(filename, "%s.dat", fontname);

    //FILE *file;
    JFileSystem *fileSys = JFileSystem::GetInstance();
    if (!fileSys->OpenFile(filename)) return;

    fileSys->ReadFile((u8 *)buffer, 2048);
    fileSys->CloseFile();

    sprintf(filename, "%s.png", fontname);
    mTexture = mRenderer->LoadTexture(filename, useVideoRAM);
	mTextureScale = (float) lineheight/ (mTexture->mHeight/16);

	if (mTexture == NULL) return;

    mHeight = (float) lineheight;

    mQuad = new JQuad(mTexture, 0.0f, 0.0f, 16.0f/mTextureScale, mHeight/mTextureScale);

    float a, b, c;

    float y = 0.0f;
    float x;

    // there are 16x16 characters in the texture map.
    float cellHeight = mTexture->mHeight/16.0f;

    int n = 0;
    for (int i=0;i<16;i++)
    {
        for (int j=0;j<16;j++)
        {
            x = (float)buffer[n*4];			// x offset
            a = (float)buffer[n*4+1];		// character width
            b = (float)buffer[n*4+2];
            c = (float)buffer[n*4+3];

            mXPos[n] = x;
            mYPos[n] = y;
            mCharWidth[n] = a+b+c;

            n++;
        }

        y += cellHeight;
    }

}


JLBFont::~JLBFont()
{
    if (mQuad)
        delete mQuad;

    if (mTexture)
        delete mTexture;

    //	JGERelease();
}


void JLBFont::DrawString(std::string s, float x, float y, int align, float leftOffset, float displayWidth)
{
    return DrawString(s.c_str(), x, y, align, leftOffset, displayWidth);
}

void JLBFont::DrawString(const char *string, float x, float y, int align, float leftOffset, float displayWidth)
{
    char *p = (char*)string;
    float dx0 = x, dy = y;

    if (mQuad == NULL) return;

    float width = GetStringWidth(string);

    if (align == JGETEXT_RIGHT)
    {
        if (displayWidth)
        {
            dx0 -= displayWidth;
            leftOffset += width - displayWidth;
        }
        else
            dx0 -= width;
    }
    else if (align == JGETEXT_CENTER)
    {
        if (displayWidth)
        {
            dx0 -= displayWidth/2;
            leftOffset += width/2 - displayWidth/2;
        }
        else
            dx0 -= width/2;
    }

    float dx = floorf(dx0);
    dy = floorf(dy);
    float x0 = dx;
    int index;
    while (*p)
    {
        if (*p == '\n')
        {
            p++;
            dy += (mHeight * 1.1 * mScale);
            dy = floorf(dy);
            dx = dx0;
            continue;
        }

        //Skip characters with no encoding.
        if((*p - 32) < 0 || (*p - 32) > 127)
        {
            p++;
            continue;
        }

        index = (*p - 32)+mBase;

        float charWidth = mCharWidth[index]*mTextureScale;
        float delta = (charWidth + mTracking) * mScale;
        float xPos =  mXPos[index];
        if (leftOffset)
        {
            if (leftOffset < 0)
            {
                dx-=leftOffset;
                leftOffset = 0;
                //continue;
            }
            else if (leftOffset - delta > 0)
            {
                leftOffset -= delta;
                p++;
                continue;
            }
            else
            {
                xPos = mXPos[index] + (leftOffset);
                delta -= leftOffset;
                leftOffset = 0;

                charWidth = (delta/mScale) - mTracking;
            }
        }
        if (displayWidth)
        {
            // This condiction must be tested indepently in the case leftOffset and displayWidth need a fix at the same time.
            if (dx > x0+displayWidth)  return;
            if (dx+delta > x0+displayWidth)
            {
                delta = x0 + displayWidth - dx;
                charWidth = (delta/mScale) - mTracking;
            }
        }
        mQuad->SetTextureRect(xPos, mYPos[index], charWidth/mTextureScale, mHeight/mTextureScale);
        mRenderer->RenderQuad(mQuad, dx, dy, mRotation, mScale*mTextureScale, mScale*mTextureScale);
        dx += delta;
        p++;
    }
}


void JLBFont::printf(float x, float y, const char *format, ...)
{
    char buffer[PRINTF_BUFFER_SIZE];
    va_list list;

    va_start(list, format);
    vsprintf(buffer, format, list);
    va_end(list);

    DrawString(buffer, x, y);
}


void JLBFont::SetColor(PIXEL_TYPE color)
{
    mColor = color;
    mQuad->SetColor(mColor);
}



float JLBFont::GetStringWidth(const char *string) const
{
    float len = 0.0f;

    const char *p = string;
    int ch;

    while (*p)
    {
        ch = *p - 32;
        p++;
        if (ch < 0) continue;
        len += (mCharWidth[ch+mBase]*mTextureScale) + mTracking;
    }
    len -= mTracking;
    return len*mScale;
}

void JLBFont::SetScale(float scale) { mScale = scale; }
void JLBFont::SetRotation(float rot) { mRotation = rot; }
void JLBFont::SetTracking(float tracking) { mTracking = tracking; }
PIXEL_TYPE JLBFont::GetColor() const { return mColor; }
float JLBFont::GetScale() const { return mScale; }
float JLBFont::GetRotation() const { return mRotation; }
float JLBFont::GetTracking() const { return mTracking; }
float JLBFont::GetHeight() const { return mHeight; }

void JLBFont::SetBase(int base)
{
    mBase = (base==0)?0:128;
}