axmol/cocos2dx/label_nodes/CCLabelAtlas.cpp

/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2011      Zynga Inc.

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,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
#include "CCLabelAtlas.h"
#include "CCTextureAtlas.h"
#include "CCPointExtension.h"
#include "CCDrawingPrimitives.h"
#include "ccConfig.h"
#include "CCShaderCache.h"
#include "CCGLProgram.h"
#include "ccGLStateCache.h"
#include "CCDirector.h"
#include "support/TransformUtils.h"
// external
#include "kazmath/GL/matrix.h"

NS_CC_BEGIN

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

bool CCLabelAtlas::initWithString(const char *label, const char *charMapFile, unsigned int itemWidth, unsigned int itemHeight, unsigned char startCharMap)
{
    CCAssert(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()
{
    unsigned int n = m_sString.length();

    ccV3F_C4B_T2F_Quad quad;

    const unsigned char *s = (unsigned char*)m_sString.c_str();

    CCTexture2D *texture = m_pTextureAtlas->getTexture();
    float textureWide = (float) texture->getPixelsWide();
    float textureHigh = (float) texture->getPixelsHigh();
    float itemWidthInPixels = m_uItemWidth * CC_CONTENT_SCALE_FACTOR();
    float itemHeightInPixels = m_uItemHeight * CC_CONTENT_SCALE_FACTOR();

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

#if CC_FIX_ARTIFACTS_BY_STRECHING_TEXEL
        // Issue #938. Don't use texStepX & texStepY
        float left        = (2 * row * itemWidthInPixels + 1) / (2 * textureWide);
        float right        = left + (itemWidthInPixels * 2 - 2) / (2 * textureWide);
        float top        = (2 * col * itemHeightInPixels + 1) / (2 * textureHigh);
        float bottom    = top + (itemHeightInPixels * 2 - 2) / (2 * textureHigh);
#else
        float left        = row * itemWidthInPixels / textureWide;
        float right        = left + itemWidthInPixels / textureWide;
        float top        = col * itemHeightInPixels / textureHigh;
        float bottom    = top + itemHeightInPixels / 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_uItemWidth);
        quad.bl.vertices.y = 0;
        quad.bl.vertices.z = 0.0f;
        quad.br.vertices.x = (float)(i * m_uItemWidth + m_uItemWidth);
        quad.br.vertices.y = 0;
        quad.br.vertices.z = 0.0f;
        quad.tl.vertices.x = (float)(i * m_uItemWidth);
        quad.tl.vertices.y = (float)(m_uItemHeight);
        quad.tl.vertices.z = 0.0f;
        quad.tr.vertices.x = (float)(i * m_uItemWidth + m_uItemWidth);
        quad.tr.vertices.y = (float)(m_uItemHeight);
        quad.tr.vertices.z = 0.0f;
        ccColor4B c = { m_tColor.r, m_tColor.g, m_tColor.b, m_cOpacity };
        quad.tl.colors = c;
        quad.tr.colors = c;
        quad.bl.colors = c;
        quad.br.colors = c;
        m_pTextureAtlas->updateQuad(&quad, i);
    }
}

//CCLabelAtlas - CCLabelProtocol
void CCLabelAtlas::setString(const char *label)
{
    unsigned int len = strlen(label);
    if (len > m_pTextureAtlas->getTotalQuads())
    {
        m_pTextureAtlas->resizeCapacity(len);
    }
    m_sString.clear();
    m_sString = label;
    this->updateAtlasValues();

    CCSize s = CCSizeMake(len * m_uItemWidth, m_uItemHeight);

    this->setContentSize(s);

    m_uQuadsToDraw = len;
}

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

//CCLabelAtlas - draw

#if CC_LABELATLAS_DEBUG_DRAW    
void CCLabelAtlas::draw()
{
    CCAtlasNode::draw();

    const CCSize& s = this->getContentSize();
    CCPoint vertices[4]={
        ccp(0,0),ccp(s.width,0),
        ccp(s.width,s.height),ccp(0,s.height),
    };
    ccDrawPoly(vertices, 4, true);
}
#endif

NS_CC_END