iOS_31_cocos2d_纹理打包(TexturePacker)

举例说明，有一张260x260像素的32位色图，

它在内存中大概占270KB（260 x 260 x 32 / 8 = 270400B），

但受纹理尺寸的限制，纹理的尺寸必须是2的n次幂，

系统将自动生成一张最接近原图尺寸的(只会比原图尺寸大)、宽高都为2的n次幂的纹理，

因此,系统将会生成一张512x512像素的纹理，

并且,最终会占用1MB的内存(512 x 512 x 32 / 8 = 1048576B)，

可以看出,实际占用的内存竟然是原图所需内存的4倍。

解决办法就是将这张260x260像素的图像改为256x256像素，系统也将生成256x256像素的纹理。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>frames</key>
        <dict>
            <key>1.png</key>
            <dict>
                <key>frame</key>
                <string>{{2,416},{92,107}}</string>
                <key>offset</key>
                <string>{-29,-26}</string>
                <key>rotated</key>
                <true/>
                <key>sourceColorRect</key>
                <string>{{91,56},{92,107}}</string>
                <key>sourceSize</key>
                <string>{332,167}</string>
            </dict>
            <key>10.png</key>
            <dict>
                <key>frame</key>
                <string>{{111,414},{184,81}}</string>
                <key>offset</key>
                <string>{-3,-29}</string>
                <key>rotated</key>
                <false/>
                <key>sourceColorRect</key>
                <string>{{71,72},{184,81}}</string>
                <key>sourceSize</key>
                <string>{332,167}</string>
            </dict>
            <key>2.png</key>
            <dict>
                <key>frame</key>
                <string>{{2,224},{190,81}}</string>
                <key>offset</key>
                <string>{-71,-29}</string>
                <key>rotated</key>
                <true/>
                <key>sourceColorRect</key>
                <string>{{0,72},{190,81}}</string>
                <key>sourceSize</key>
                <string>{332,167}</string>
            </dict>
            <key>3.png</key>
            <dict>
                <key>frame</key>
                <string>{{297,337},{136,127}}</string>
                <key>offset</key>
                <string>{-46,-6}</string>
                <key>rotated</key>
                <true/>
                <key>sourceColorRect</key>
                <string>{{52,26},{136,127}}</string>
                <key>sourceSize</key>
                <string>{332,167}</string>
            </dict>
            <key>4.png</key>
            <dict>
                <key>frame</key>
                <string>{{297,182},{158,153}}</string>
                <key>offset</key>
                <string>{-59,7}</string>
                <key>rotated</key>
                <false/>
                <key>sourceColorRect</key>
                <string>{{28,0},{158,153}}</string>
                <key>sourceSize</key>
                <string>{332,167}</string>
            </dict>
            <key>5.png</key>
            <dict>
                <key>frame</key>
                <string>{{85,224},{188,149}}</string>
                <key>offset</key>
                <string>{-12,5}</string>
                <key>rotated</key>
                <true/>
                <key>sourceColorRect</key>
                <string>{{60,4},{188,149}}</string>
                <key>sourceSize</key>
                <string>{332,167}</string>
            </dict>
            <key>6.png</key>
            <dict>
                <key>frame</key>
                <string>{{2,2},{242,143}}</string>
                <key>offset</key>
                <string>{45,2}</string>
                <key>rotated</key>
                <false/>
                <key>sourceColorRect</key>
                <string>{{90,10},{242,143}}</string>
                <key>sourceSize</key>
                <string>{332,167}</string>
            </dict>
            <key>7.png</key>
            <dict>
                <key>frame</key>
                <string>{{246,2},{242,119}}</string>
                <key>offset</key>
                <string>{45,-10}</string>
                <key>rotated</key>
                <false/>
                <key>sourceColorRect</key>
                <string>{{90,34},{242,119}}</string>
                <key>sourceSize</key>
                <string>{332,167}</string>
            </dict>
            <key>8.png</key>
            <dict>
                <key>frame</key>
                <string>{{246,123},{232,57}}</string>
                <key>offset</key>
                <string>{40,-41}</string>
                <key>rotated</key>
                <false/>
                <key>sourceColorRect</key>
                <string>{{90,96},{232,57}}</string>
                <key>sourceSize</key>
                <string>{332,167}</string>
            </dict>
            <key>9.png</key>
            <dict>
                <key>frame</key>
                <string>{{2,147},{198,75}}</string>
                <key>offset</key>
                <string>{24,-32}</string>
                <key>rotated</key>
                <false/>
                <key>sourceColorRect</key>
                <string>{{91,78},{198,75}}</string>
                <key>sourceSize</key>
                <string>{332,167}</string>
            </dict>
        </dict>
        <key>metadata</key>
        <dict>
            <key>format</key>
            <integer>2</integer>
            <key>realTextureFileName</key>
            <string>zhaoyun.png</string>
            <key>size</key>
            <string>{512,512}</string>
            <key>smartupdate</key>
            <string>$TexturePacker:SmartUpdate:aae1cbd56ecaac00aa0364cad5d7b3d2:1/1$</string>
            <key>textureFileName</key>
            <string>zhaoyun.png</string>
        </dict>
    </dict>
</plist>