axmol/cocos2dx/label_nodes/CCLabelAtlas.cpp

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

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****************************************************************************/
#include "CCLabelAtlas.h"
#include "CCTextureAtlas.h"
#include "CGPointExtension.h"
#include "CCDrawingPrimitives.h"

namespace cocos2d{

	//CCLabelAtlas - Creation & Init
	CCLabelAtlas * CCLabelAtlas::labelWithString(const char *label, const char *charMapFile, int itemWidth, int itemHeight, char startCharMap)
	{
		CCLabelAtlas *pRet = new CCLabelAtlas();
		if(pRet && pRet->initWithString(label, charMapFile, itemWidth, itemHeight, startCharMap))
		{
			pRet->autorelease();
			return pRet;
		}
		CCX_SAFE_DELETE(pRet)
		return NULL;
	}

    CCLabelAtlas * CCLabelAtlas::labelAtlasWithString(const char *label, const char *charMapFile, int itemWidth, int itemHeight, char startCharMap)
    {
        return labelWithString(label, charMapFile, itemWidth, itemHeight, startCharMap);
    }

	bool CCLabelAtlas::initWithString(const char *label, const char *charMapFile, int itemWidth, int itemHeight, char startCharMap)
	{
		assert(label != NULL);
		if (CCAtlasNode::initWithTileFile(charMapFile, itemWidth, itemHeight, strlen(label)))
		{
			m_cMapStartChar = startCharMap;
			this->setString(label);
			return true;
		}
		return false;
	}

	//CCLabelAtlas - Atlas generation
	void CCLabelAtlas::updateAtlasValues()
	{
		int n = m_sString.length();

		ccV3F_C4B_T2F_Quad quad;

		const char *s = m_sString.c_str();

        CCTexture2D *texture = m_pTextureAtlas->getTexture();
        float textureWide = (float) texture->getPixelsWide();
        float textureHigh = (float) texture->getPixelsHigh();

		for( int i=0; i<n; i++) {
			unsigned char a = s[i] - m_cMapStartChar;
			float row = (float) (a % m_nItemsPerRow);
			float col = (float) (a / m_nItemsPerRow);

#if CC_FIX_ARTIFACTS_BY_STRECHING_TEXEL
            // Issue #938. Don't use texStepX & texStepY
            float left		= (2 * row * m_nItemWidth + 1) / (2 * textureWide);
            float right		= left + (m_nItemWidth * 2 - 2) / (2 * textureWide);
            float top		= (2 * col * m_nItemHeight + 1) / (2 * textureHigh);
            float bottom	= top + (m_nItemHeight * 2 - 2) / (2 * textureHigh);
#else
            float left		= row * m_nItemWidth / textureWide;
            float right		= left + m_nItemWidth / textureWide;
            float top		= col * m_nItemHeight / textureHigh;
            float bottom	= top + m_nItemHeight / textureHigh;
#endif // ! CC_FIX_ARTIFACTS_BY_STRECHING_TEXEL

            quad.tl.texCoords.u = left;
            quad.tl.texCoords.v = top;
            quad.tr.texCoords.u = right;
            quad.tr.texCoords.v = top;
            quad.bl.texCoords.u = left;
            quad.bl.texCoords.v = bottom;
            quad.br.texCoords.u = right;
            quad.br.texCoords.v = bottom;

			quad.bl.vertices.x = (float) (i * m_nItemWidth);
			quad.bl.vertices.y = 0;
			quad.bl.vertices.z = 0.0f;
			quad.br.vertices.x = (float)(i * m_nItemWidth + m_nItemWidth);
			quad.br.vertices.y = 0;
			quad.br.vertices.z = 0.0f;
			quad.tl.vertices.x = (float)(i * m_nItemWidth);
			quad.tl.vertices.y = (float)(m_nItemHeight);
			quad.tl.vertices.z = 0.0f;
			quad.tr.vertices.x = (float)(i * m_nItemWidth + m_nItemWidth);
			quad.tr.vertices.y = (float)(m_nItemHeight);
			quad.tr.vertices.z = 0.0f;

			m_pTextureAtlas->updateQuad(&quad, i);
		}
	}
	
	//CCLabelAtlas - CCLabelProtocol
	void CCLabelAtlas::setString(const char *label)
	{
		if (strlen(label) > m_pTextureAtlas->getTotalQuads())
		{
			m_pTextureAtlas->resizeCapacity(strlen(label));
		}
		m_sString.clear();
		m_sString = label;
		this->updateAtlasValues();

		CGSize s;
		s.width = (float)(m_sString.length() * m_nItemWidth);
		s.height = (float)(m_nItemHeight);
		this->setContentSizeInPixels(s);
	}

	const char* CCLabelAtlas::getString(void)
	{
		return m_sString.c_str();
	}

	//CCLabelAtlas - draw

	// XXX: overriding draw from AtlasNode
	void CCLabelAtlas::draw()
	{
		// Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
		// Needed states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_TEXTURE_COORD_ARRAY
		// Unneeded states: GL_COLOR_ARRAY
		glDisableClientState(GL_COLOR_ARRAY);

		glColor4ub( m_tColor.r, m_tColor.g, m_tColor.b, m_cOpacity);

		bool newBlend = (m_tBlendFunc.src != CC_BLEND_SRC || m_tBlendFunc.dst != CC_BLEND_DST);
		if(newBlend)
        {
			glBlendFunc( m_tBlendFunc.src, m_tBlendFunc.dst );
		}

		m_pTextureAtlas->drawNumberOfQuads(m_sString.length());

		if( newBlend )
			glBlendFunc(CC_BLEND_SRC, CC_BLEND_DST);

		// is this chepear than saving/restoring color state ?
		// XXX: There is no need to restore the color to (255,255,255,255). Objects should use the color
		// XXX: that they need
		//	glColor4ub( 255, 255, 255, 255);

		// Restore Default GL state. Enable GL_COLOR_ARRAY
		glEnableClientState(GL_COLOR_ARRAY);


#if CC_LABELATLAS_DEBUG_DRAW
		CGSize s = this->getContentSize();
		CGPoint vertices[4]={
			ccp(0,0),ccp(s.width,0),
			ccp(s.width,s.height),ccp(0,s.height),
		};
		ccDrawPoly(vertices, 4, true);
#endif // CC_LABELATLAS_DEBUG_DRAW

	}
} // namespace cocos2d