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authorscuri <scuri>2011-08-16 18:21:44 +0000
committerscuri <scuri>2011-08-16 18:21:44 +0000
commit51f26b3868b62f70f49e11dab933b4778ffa84c6 (patch)
tree579eafa29c20daabd6189ab0e2d11a0931bb7296 /html/en
parent419293cfcee27e46525b9f1e94e7da102b7c7d00 (diff)
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Diffstat (limited to 'html/en')
-rw-r--r--html/en/samples.html24
1 files changed, 21 insertions, 3 deletions
diff --git a/html/en/samples.html b/html/en/samples.html
index e088f3b..accd638 100644
--- a/html/en/samples.html
+++ b/html/en/samples.html
@@ -39,9 +39,27 @@
<pre><code>cdCanvas* canvas = cdCreateCanvasf(CD_IMAGERGB, &quot;%dx%d&quot;, width, height);
</code>cd<code>Canvas</code>LineStyle(<code>canvas, </code>CD_DASHED);
cd<code>Canvas</code>Line(<code>canvas, </code>10, 10, 50, 50);
-unsigned char* red = cdCanvasGetAttribute(canvas, &quot;REDIMAGE&quot;);
-// do something with the raw image data
-cdKillCanvas(canvas);
+cdKillCanvas(canvas); </pre>
+<p>To save the contents of the CD_IMAGERGB canvas in a file using IM, after
+drawing and before destroying the canvas do:</p>
+<pre>unsigned char* data = cdCanvasGetAttribute(canvas, &quot;REDIMAGE&quot;); // Also a pointer to the full buffer
+imImage* image = <strong>imImageInit</strong>(width, height, IM_RGB, IM_BYTE, data, NULL, 0);
+// Can use also IM_RGB|IM_ALPHA is canvas has support for alpha
+<strong>imFileImageSave</strong>(file_name, &quot;PNG&quot;, image);
+image-&gt;data[0] = NULL; // to avoid duplicate memory release
+<strong>imImageDestroy</strong>(image);</pre>
+<p>Or using another approach:</p>
+<pre>imImage* image = <strong>imImageCreate</strong>(width, height, IM_RGB, IM_BYTE);
+// Can also call <strong>imImageAddAlpha</strong> if alpha support is wanted
+
+<code>cdCanvas* canvas = cdCreateCanvasf(CD_IMAGERGB, &quot;%dx%d %p %p %p&quot;, width, height,
+ image-&gt;data[0], image-&gt;data[1], image-&gt;data[2]);
+</code>cd<code>Canvas</code>LineStyle(<code>canvas, </code>CD_DASHED);
+cd<code>Canvas</code>Line(<code>canvas, </code>10, 10, 50, 50);
+cdKillCanvas(canvas);
+
+<strong>imFileImageSave</strong>(file_name, &quot;PNG&quot;, image);
+<strong>imImageDestroy</strong>(image);
</pre>