axmol/cocos2dx/platform/qnx/CCImage_qnx.cpp

/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

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****************************************************************************/

#include "CCImage.h"

#include "SkTypeface.h"
#include "SkBitmap.h"
#include "SkPaint.h"
#include "SkCanvas.h"

using namespace std;

NS_CC_BEGIN

class BitmapDC
{
public:
    BitmapDC() : m_pBitmap(NULL),
                       m_pPaint(NULL)
    {
    }

    ~BitmapDC(void)
    {
        CC_SAFE_DELETE(m_pPaint);
        CC_SAFE_DELETE(m_pBitmap);
    }

    bool setFont(const char *pFontName = NULL, int nSize = 0)
    {
        bool bRet = false;

        if (m_pPaint)
        {
            delete m_pPaint;
            m_pPaint = NULL;
        }

        do 
        {
            /* init paint */
            m_pPaint = new SkPaint();
            CC_BREAK_IF(! m_pPaint);
            m_pPaint->setColor(SK_ColorWHITE);
            m_pPaint->setTextSize(nSize);

            /* create font */
            SkTypeface *pTypeFace = SkTypeface::CreateFromName(pFontName, SkTypeface::kNormal);
            if (! pTypeFace)
            {
                // let's replace with Arial first before failing
                pTypeFace = SkTypeface::CreateFromName("Arial", SkTypeface::kNormal);
                CCLOG("could not find font %s replacing with Arial\n", pFontName);

                if (!pTypeFace)
                {
                    CC_SAFE_DELETE(m_pPaint);
                    break;
                }
            }
            m_pPaint->setTypeface( pTypeFace );
            /* cannot unref, I don't know why. It may be memory leak, but how to avoid? */
            pTypeFace->unref();

            bRet = true;
        } while (0);

        return bRet;
    }

    bool prepareBitmap(int nWidth, int nHeight)
    {
        // release bitmap
        if (m_pBitmap)
        {
            delete m_pBitmap;
            m_pBitmap = NULL;
        }
        
        if (nWidth > 0 && nHeight > 0)
        {
            /* create and init bitmap */
            m_pBitmap = new SkBitmap();
            if (! m_pBitmap)
            {
                return false;
            }

            /* use rgba8888 and alloc memory */
            m_pBitmap->setConfig(SkBitmap::kARGB_8888_Config, nWidth, nHeight);
            if (! m_pBitmap->allocPixels())
            {
                CC_SAFE_DELETE(m_pBitmap);
                return false;
            }

            /* start with black/transparent pixels */
            m_pBitmap->eraseColor(0);
        }

        return true;
    }

    bool drawText(const char *pszText, int nWidth, int nHeight, CCImage::ETextAlign eAlignMask)
    {
        bool bRet = false;

        do 
        {
            CC_BREAK_IF(! pszText);
            CC_BREAK_IF(! prepareBitmap(nWidth, nHeight));

            /* create canvas */
            SkPaint::FontMetrics font;
            m_pPaint->getFontMetrics(&font);
            SkCanvas canvas(*m_pBitmap);

            /*
             * draw text
             * @todo: alignment
             */
            canvas.drawText(pszText, strlen(pszText), 0.0, -font.fAscent, *m_pPaint);
            bRet = true;
        } while (0);

        return bRet;
    }

    bool getTextExtentPoint(const char * pszText, int *pWidth, int *pHeight)
    {
        bool bRet = false;

        do 
        {
            CC_BREAK_IF(!pszText || !pWidth || !pHeight);

            // get text width and height
            if (m_pPaint)
            {
                SkPaint::FontMetrics font;
                m_pPaint->getFontMetrics(&font);
                *pHeight = (int)ceil((font.fDescent - font.fAscent));
                *pWidth = (int)ceil((m_pPaint->measureText(pszText, strlen(pszText))));

                bRet = true;
            }            
        } while (0);

        return bRet;
    }

    SkBitmap* getBitmap()
    {
        return m_pBitmap;
    }

private:
    SkPaint  *m_pPaint;
    SkBitmap *m_pBitmap;

};

static BitmapDC& sharedBitmapDC()
{
    static BitmapDC s_BmpDC;
    return s_BmpDC;
}

bool CCImage::initWithString(
                               const char *    pText, 
                               int             nWidth/* = 0*/, 
                               int             nHeight/* = 0*/,
                               ETextAlign      eAlignMask/* = kAlignCenter*/,
                               const char *    pFontName/* = nil*/,
                               int             nSize/* = 0*/)
{
    bool bRet = false;

    do 
    {
        CC_BREAK_IF(! pText);
        
        BitmapDC &dc = sharedBitmapDC();

        /* init font with font name and size */
        CC_BREAK_IF(! dc.setFont(pFontName, nSize));

        /* compute text width and height */
        if (nWidth <= 0 || nHeight <= 0)
        {
            dc.getTextExtentPoint(pText, &nWidth, &nHeight);
        }
        CC_BREAK_IF(nWidth <= 0 || nHeight <= 0);

        CC_BREAK_IF( false == dc.drawText(pText, nWidth, nHeight, eAlignMask) );

        /*init image information */
        SkBitmap *pBitmap = dc.getBitmap();
        CC_BREAK_IF(! pBitmap);

        int nWidth    = pBitmap->width();
        int nHeight    = pBitmap->height();
        CC_BREAK_IF(nWidth <= 0 || nHeight <= 0);

        int nDataLen = pBitmap->rowBytes() * pBitmap->height();
        m_pData = new unsigned char[nDataLen];
        CC_BREAK_IF(! m_pData);
        memcpy((void*) m_pData, pBitmap->getPixels(), nDataLen);

        m_nWidth    = (short)nWidth;
        m_nHeight   = (short)nHeight;
        m_bHasAlpha = true;
        m_bPreMulti = true;
        m_nBitsPerComponent = pBitmap->bytesPerPixel();

        bRet = true;
    } while (0);

    return bRet;
}

NS_CC_END