axmol/cocos2dx/platform/android/CCImage_android.cpp

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

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

// undefine ANDROID to include skia headers
#ifdef ANDROID
#undef ANDROID
#endif

/* used for SkRefCnt::unref(), it used to decrease the count */
static int sk_atomic_dec(int *value)
{
	*value = *value - 1;
	return *value;
}

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

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)
			{
				CC_SAFE_DELETE(m_pPaint);
				break;
			}
			m_pPaint->setTypeface( pTypeFace );
			/* can not 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);

		bRet = 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;