<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"HTML-esimuotoiltu Char";
margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
span.Shkpostityyli17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.HTML-esimuotoiltuChar
{mso-style-name:"HTML-esimuotoiltu Char";
mso-style-priority:99;
mso-style-link:HTML-esimuotoiltu;
font-family:"Courier New";
mso-fareast-language:FI;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 2.0cm 70.85pt 2.0cm;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:958728540;
mso-list-type:hybrid;
mso-list-template-ids:1685254106 -1690656744 67829763 67829765 67829761 67829763 67829765 67829761 67829763 67829765;}
@list l0:level1
{mso-level-start-at:0;
mso-level-number-format:bullet;
mso-level-text:\F0D8;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;
mso-fareast-font-family:"Times New Roman";
mso-bidi-font-family:"Courier New";}
@list l0:level2
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level3
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
@list l0:level4
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Symbol;}
@list l0:level5
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level6
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
@list l0:level7
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Symbol;}
@list l0:level8
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:"Courier New";}
@list l0:level9
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;
font-family:Wingdings;}
ol
{margin-bottom:0cm;}
ul
{margin-bottom:0cm;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="FI" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I was wondering if this idea could resolve also this old ticket
<a href="https://trac.osgeo.org/gdal/ticket/1233">https://trac.osgeo.org/gdal/ticket/1233</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">-Jukka Rahkonen-<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal">Even Rouault wrote:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<pre><span lang="EN-US">Hi,<o:p></o:p></span></pre>
<pre><span lang="EN-US"><o:p> </o:p></span></pre>
<pre><span lang="EN-US">I was wondering if there wasn't a need for a block iterator API for code that <o:p></o:p></span></pre>
<pre><span lang="EN-US">wants to process raster efficiently and iterates over blocks from top to bottom, <o:p></o:p></span></pre>
<pre><span lang="EN-US">and left to write. Currently you have to create 2 for loops and deal with <o:p></o:p></span></pre>
<pre><span lang="EN-US">partial blocks at edges (see <o:p></o:p></span></pre>
<pre><a href="https://trac.osgeo.org/gdal/browser/trunk/gdal/gcore/rasterio.cpp#L3576" target="_top"><span lang="EN-US">https://trac.osgeo.org/gdal/browser/trunk/gdal/gcore/rasterio.cpp#L3576</span></a><span lang="EN-US">). <o:p></o:p></span></pre>
<pre><span lang="EN-US">Nothing really fundamentaly complicated, but I guess people have to often <o:p></o:p></span></pre>
<pre><span lang="EN-US">write that boring code and I'm sure there a lot of occurences of it inside <o:p></o:p></span></pre>
<pre><span lang="EN-US">GDAL itself. The API just returns the coordinates of the window, but doesn't <o:p></o:p></span></pre>
<pre><span lang="EN-US">do the pixel queries (people could use it to operate on a single band, or <o:p></o:p></span></pre>
<pre>multiple bands)<o:p></o:p></pre>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>