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<h1>include/core/SkMask.h</h1><a href="_sk_mask_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright (C) 2006 The Android Open Source Project</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span>
<a name="l00005"></a>00005 <span class="comment"> * you may not use this file except in compliance with the License.</span>
<a name="l00006"></a>00006 <span class="comment"> * You may obtain a copy of the License at</span>
<a name="l00007"></a>00007 <span class="comment"> *</span>
<a name="l00008"></a>00008 <span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span>
<a name="l00011"></a>00011 <span class="comment"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<a name="l00012"></a>00012 <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<a name="l00013"></a>00013 <span class="comment"> * See the License for the specific language governing permissions and</span>
<a name="l00014"></a>00014 <span class="comment"> * limitations under the License.</span>
<a name="l00015"></a>00015 <span class="comment"> */</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="preprocessor">#ifndef SkMask_DEFINED</span>
<a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor">#define SkMask_DEFINED</span>
<a name="l00019"></a>00019 <span class="preprocessor"></span>
<a name="l00020"></a>00020 <span class="preprocessor">#include &quot;<a class="code" href="_sk_rect_8h.html">SkRect.h</a>&quot;</span>
<a name="l00021"></a>00021
<a name="l00026"></a><a class="code" href="struct_sk_mask.html">00026</a> <span class="keyword">struct </span><a class="code" href="struct_sk_mask.html">SkMask</a> {
<a name="l00027"></a><a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562">00027</a> <span class="keyword">enum</span> <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562">Format</a> {
<a name="l00028"></a><a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562ae4418aac30fe79e67375504bbc4f0574">00028</a> <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562ae4418aac30fe79e67375504bbc4f0574" title="1bit per pixel mask (e.g. monochrome)">kBW_Format</a>,
<a name="l00029"></a><a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562a6afc497620a34b81a48c99f29623ab5f">00029</a> <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562a6afc497620a34b81a48c99f29623ab5f" title="8bits per pixel mask (e.g. antialiasing)">kA8_Format</a>,
<a name="l00030"></a><a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562a126aa3184ccfbae44a070b897289eb1a">00030</a> <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562a126aa3184ccfbae44a070b897289eb1a" title="3 8bit per pixl planes: alpha, mul, add">k3D_Format</a>,
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="comment">/* The LCD formats look like this in memory:</span>
<a name="l00033"></a>00033 <span class="comment"></span>
<a name="l00034"></a>00034 <span class="comment"> First, there&apos;s an A8 plane which contains the average alpha value for</span>
<a name="l00035"></a>00035 <span class="comment"> each pixel. Because of this, the LCD formats can be passed directly</span>
<a name="l00036"></a>00036 <span class="comment"> to functions which expect an A8 and everything will just work.</span>
<a name="l00037"></a>00037 <span class="comment"></span>
<a name="l00038"></a>00038 <span class="comment"> After that in memory, there&apos;s a bitmap of 32-bit values which have</span>
<a name="l00039"></a>00039 <span class="comment"> been RGB order corrected for the current screen (based on the</span>
<a name="l00040"></a>00040 <span class="comment"> settings in SkFontHost at the time of renderering). The alpha value</span>
<a name="l00041"></a>00041 <span class="comment"> for each pixel is the maximum of the three alpha values.</span>
<a name="l00042"></a>00042 <span class="comment"></span>
<a name="l00043"></a>00043 <span class="comment"> kHorizontalLCD_Format has an extra column of pixels on the left and right</span>
<a name="l00044"></a>00044 <span class="comment"> edges. kVerticalLCD_Format has an extra row at the top and bottom.</span>
<a name="l00045"></a>00045 <span class="comment"> */</span>
<a name="l00046"></a>00046
<a name="l00047"></a><a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562ac729b41114e4a17fe47f3b6c480e1c4d">00047</a> <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562ac729b41114e4a17fe47f3b6c480e1c4d" title="4 bytes/pixel: a/r/g/b">kHorizontalLCD_Format</a>,
<a name="l00048"></a><a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562a8f7b79484b2e5e7c0f551ab8aec46d88">00048</a> <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562a8f7b79484b2e5e7c0f551ab8aec46d88" title="4 bytes/pixel: a/r/g/b">kVerticalLCD_Format</a>,
<a name="l00049"></a>00049 };
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="keyword">enum</span> {
<a name="l00052"></a><a class="code" href="struct_sk_mask.html#a7fc6f8787304fb212d8ee096fd0d5951a693fdbc66526ab54395b4dae688196cd">00052</a> <a class="code" href="struct_sk_mask.html#a7fc6f8787304fb212d8ee096fd0d5951a693fdbc66526ab54395b4dae688196cd">kCountMaskFormats</a> = <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562a8f7b79484b2e5e7c0f551ab8aec46d88" title="4 bytes/pixel: a/r/g/b">kVerticalLCD_Format</a> + 1
<a name="l00053"></a>00053 };
<a name="l00054"></a>00054
<a name="l00055"></a><a class="code" href="struct_sk_mask.html#a4545f4c41bd6ac96a50296a50fa5de60">00055</a> uint8_t* <a class="code" href="struct_sk_mask.html#a4545f4c41bd6ac96a50296a50fa5de60">fImage</a>;
<a name="l00056"></a><a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">00056</a> <a class="code" href="struct_sk_i_rect.html">SkIRect</a> <a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>;
<a name="l00057"></a><a class="code" href="struct_sk_mask.html#a3c93e4df76645a7296e545223ca2ab20">00057</a> uint32_t <a class="code" href="struct_sk_mask.html#a3c93e4df76645a7296e545223ca2ab20">fRowBytes</a>;
<a name="l00058"></a><a class="code" href="struct_sk_mask.html#a7eae01ef86483a508e700861039d1d55">00058</a> <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562">Format</a> <a class="code" href="struct_sk_mask.html#a7eae01ef86483a508e700861039d1d55">fFormat</a>;
<a name="l00059"></a>00059
<a name="l00062"></a><a class="code" href="struct_sk_mask.html#ae3c5f6a73a76f39c9756b257b0f660f1">00062</a> <span class="keywordtype">bool</span> <a class="code" href="struct_sk_mask.html#ae3c5f6a73a76f39c9756b257b0f660f1">isEmpty</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#aab493e2484063057687a8a4a08c46041">isEmpty</a>(); }
<a name="l00063"></a>00063
<a name="l00068"></a>00068 <span class="keywordtype">size_t</span> <a class="code" href="struct_sk_mask.html#afc78cc1c03a0fc2dab51450d46db8ad0">computeImageSize</a>() <span class="keyword">const</span>;
<a name="l00069"></a>00069
<a name="l00074"></a>00074 <span class="keywordtype">size_t</span> <a class="code" href="struct_sk_mask.html#a1af229043d47792821c0163de9bb59e3">computeTotalImageSize</a>() <span class="keyword">const</span>;
<a name="l00075"></a>00075
<a name="l00080"></a><a class="code" href="struct_sk_mask.html#a6e379e90e040977a24bdde9598845d45">00080</a> uint8_t* <a class="code" href="struct_sk_mask.html#a6e379e90e040977a24bdde9598845d45">getAddr1</a>(<span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y)<span class="keyword"> const </span>{
<a name="l00081"></a>00081 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(<a class="code" href="struct_sk_mask.html#a7eae01ef86483a508e700861039d1d55">fFormat</a> == <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562ae4418aac30fe79e67375504bbc4f0574" title="1bit per pixel mask (e.g. monochrome)">kBW_Format</a>);
<a name="l00082"></a>00082 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(<a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#a47edb74ed68acc9ba2d3db8820976235">contains</a>(x, y));
<a name="l00083"></a>00083 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(<a class="code" href="struct_sk_mask.html#a4545f4c41bd6ac96a50296a50fa5de60">fImage</a> != NULL);
<a name="l00084"></a>00084 <span class="keywordflow">return</span> <a class="code" href="struct_sk_mask.html#a4545f4c41bd6ac96a50296a50fa5de60">fImage</a> + ((x - <a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#ac3c4aefa2175abca9eed325b0ad279d2">fLeft</a>) &gt;&gt; 3) + (y - <a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#a83d97be3c30b629a8f2abff70cb9d116">fTop</a>) * <a class="code" href="struct_sk_mask.html#a3c93e4df76645a7296e545223ca2ab20">fRowBytes</a>;
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086
<a name="l00091"></a><a class="code" href="struct_sk_mask.html#a5f23acda980e17a50cd0f13452a34283">00091</a> uint8_t* <a class="code" href="struct_sk_mask.html#a5f23acda980e17a50cd0f13452a34283">getAddr</a>(<span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y)<span class="keyword"> const </span>{
<a name="l00092"></a>00092 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(<a class="code" href="struct_sk_mask.html#a7eae01ef86483a508e700861039d1d55">fFormat</a> != <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562ae4418aac30fe79e67375504bbc4f0574" title="1bit per pixel mask (e.g. monochrome)">kBW_Format</a>);
<a name="l00093"></a>00093 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(<a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#a47edb74ed68acc9ba2d3db8820976235">contains</a>(x, y));
<a name="l00094"></a>00094 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(<a class="code" href="struct_sk_mask.html#a4545f4c41bd6ac96a50296a50fa5de60">fImage</a> != NULL);
<a name="l00095"></a>00095 <span class="keywordflow">return</span> <a class="code" href="struct_sk_mask.html#a4545f4c41bd6ac96a50296a50fa5de60">fImage</a> + x - <a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#ac3c4aefa2175abca9eed325b0ad279d2">fLeft</a> + (y - <a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#a83d97be3c30b629a8f2abff70cb9d116">fTop</a>) * <a class="code" href="struct_sk_mask.html#a3c93e4df76645a7296e545223ca2ab20">fRowBytes</a>;
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097
<a name="l00101"></a><a class="code" href="struct_sk_mask.html#ad2106305b155f6ad3847a9510d46fc6d">00101</a> <span class="keyword">const</span> uint32_t* <a class="code" href="struct_sk_mask.html#ad2106305b155f6ad3847a9510d46fc6d">getAddrLCD</a>(<span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y)<span class="keyword"> const </span>{
<a name="l00102"></a>00102 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(<a class="code" href="struct_sk_mask.html#a7eae01ef86483a508e700861039d1d55">fFormat</a> == <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562ac729b41114e4a17fe47f3b6c480e1c4d" title="4 bytes/pixel: a/r/g/b">kHorizontalLCD_Format</a> || <a class="code" href="struct_sk_mask.html#a7eae01ef86483a508e700861039d1d55">fFormat</a> == <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562a8f7b79484b2e5e7c0f551ab8aec46d88" title="4 bytes/pixel: a/r/g/b">kVerticalLCD_Format</a>);
<a name="l00103"></a>00103 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(<a class="code" href="struct_sk_mask.html#a4545f4c41bd6ac96a50296a50fa5de60">fImage</a> != NULL);
<a name="l00104"></a>00104
<a name="l00105"></a>00105 <span class="keywordflow">return</span> <span class="keyword">reinterpret_cast&lt;</span><span class="keyword">const </span>uint32_t*<span class="keyword">&gt;</span>(<a class="code" href="struct_sk_mask.html#a4545f4c41bd6ac96a50296a50fa5de60">fImage</a> + <a class="code" href="_sk_types_8h.html#a885b24406698ebaf207170b01a39b56a">SkAlign4</a>(<a class="code" href="struct_sk_mask.html#a3c93e4df76645a7296e545223ca2ab20">fRowBytes</a> * <a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#a875033b827d28de9786ebbc9f8a284f9">height</a>())) +
<a name="l00106"></a>00106 x - <a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#ac3c4aefa2175abca9eed325b0ad279d2">fLeft</a> + (y - <a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#a83d97be3c30b629a8f2abff70cb9d116">fTop</a>) * <a class="code" href="struct_sk_mask.html#ab037ca3f903cadc80f21bd8f1d9e163f">rowWordsLCD</a>();
<a name="l00107"></a>00107 }
<a name="l00108"></a>00108
<a name="l00112"></a><a class="code" href="struct_sk_mask.html#ab037ca3f903cadc80f21bd8f1d9e163f">00112</a> <span class="keywordtype">unsigned</span> <a class="code" href="struct_sk_mask.html#ab037ca3f903cadc80f21bd8f1d9e163f">rowWordsLCD</a>()<span class="keyword"> const </span>{
<a name="l00113"></a>00113 <a class="code" href="_sk_types_8h.html#acc82ca88a67ae7ce95a107a9a4b81123">SkASSERT</a>(<a class="code" href="struct_sk_mask.html#a7eae01ef86483a508e700861039d1d55">fFormat</a> == <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562ac729b41114e4a17fe47f3b6c480e1c4d" title="4 bytes/pixel: a/r/g/b">kHorizontalLCD_Format</a> || <a class="code" href="struct_sk_mask.html#a7eae01ef86483a508e700861039d1d55">fFormat</a> == <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562a8f7b79484b2e5e7c0f551ab8aec46d88" title="4 bytes/pixel: a/r/g/b">kVerticalLCD_Format</a>);
<a name="l00114"></a>00114 <span class="keywordflow">if</span> (<a class="code" href="struct_sk_mask.html#a7eae01ef86483a508e700861039d1d55">fFormat</a> == <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562ac729b41114e4a17fe47f3b6c480e1c4d" title="4 bytes/pixel: a/r/g/b">kHorizontalLCD_Format</a>)
<a name="l00115"></a>00115 <span class="keywordflow">return</span> <a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#a48f490d821b1df11fd0e103ae9b64b2c">width</a>() + 2;
<a name="l00116"></a>00116 <span class="keywordflow">else</span>
<a name="l00117"></a>00117 <span class="keywordflow">return</span> <a class="code" href="struct_sk_mask.html#a99d3c12766a328024af8b8f93365ce54">fBounds</a>.<a class="code" href="struct_sk_i_rect.html#a48f490d821b1df11fd0e103ae9b64b2c">width</a>();
<a name="l00118"></a>00118 }
<a name="l00119"></a>00119
<a name="l00120"></a>00120 <span class="keyword">static</span> uint8_t* <a class="code" href="struct_sk_mask.html#a3c37c60001249525f00af35b53c59636">AllocImage</a>(<span class="keywordtype">size_t</span> bytes);
<a name="l00121"></a>00121 <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="struct_sk_mask.html#acf611e565267afedff95e0377fc972f5">FreeImage</a>(<span class="keywordtype">void</span>* image);
<a name="l00122"></a>00122
<a name="l00123"></a><a class="code" href="struct_sk_mask.html#abb010896d9c88b1582222e50674f431e">00123</a> <span class="keyword">enum</span> <a class="code" href="struct_sk_mask.html#abb010896d9c88b1582222e50674f431e">CreateMode</a> {
<a name="l00124"></a><a class="code" href="struct_sk_mask.html#abb010896d9c88b1582222e50674f431eaeac3bbeff02e3d4189bdc11d3b6dd21b">00124</a> <a class="code" href="struct_sk_mask.html#abb010896d9c88b1582222e50674f431eaeac3bbeff02e3d4189bdc11d3b6dd21b" title="compute bounds and return">kJustComputeBounds_CreateMode</a>,
<a name="l00125"></a><a class="code" href="struct_sk_mask.html#abb010896d9c88b1582222e50674f431eabeca649f3ea7180c9c87ffbad3a9804b">00125</a> <a class="code" href="struct_sk_mask.html#abb010896d9c88b1582222e50674f431eabeca649f3ea7180c9c87ffbad3a9804b" title="render into preallocate mask">kJustRenderImage_CreateMode</a>,
<a name="l00126"></a><a class="code" href="struct_sk_mask.html#abb010896d9c88b1582222e50674f431eafbc8dc9198e2daabc6171510109925cd">00126</a> <a class="code" href="struct_sk_mask.html#abb010896d9c88b1582222e50674f431eafbc8dc9198e2daabc6171510109925cd" title="compute bounds, alloc image and render into it">kComputeBoundsAndRenderImage_CreateMode</a>
<a name="l00127"></a>00127 };
<a name="l00128"></a>00128
<a name="l00129"></a><a class="code" href="struct_sk_mask.html#ad325b71f27da43756e70cf600d985f70">00129</a> <span class="keyword">static</span> <span class="keywordtype">bool</span> <a class="code" href="struct_sk_mask.html#ad325b71f27da43756e70cf600d985f70">FormatIsLCD</a>(<a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562">Format</a> fm) {
<a name="l00130"></a>00130 <span class="keywordflow">return</span> <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562ac729b41114e4a17fe47f3b6c480e1c4d" title="4 bytes/pixel: a/r/g/b">kHorizontalLCD_Format</a> == fm || <a class="code" href="struct_sk_mask.html#a8b32add12b978bf8ab2d7b3ab348a562a8f7b79484b2e5e7c0f551ab8aec46d88" title="4 bytes/pixel: a/r/g/b">kVerticalLCD_Format</a> == fm;
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 };
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="preprocessor">#endif</span>
<a name="l00135"></a>00135 <span class="preprocessor"></span>
</pre></div></div>
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