From 51f26b3868b62f70f49e11dab933b4778ffa84c6 Mon Sep 17 00:00:00 2001 From: scuri Date: Tue, 16 Aug 2011 18:21:44 +0000 Subject: *** empty log message *** --- html/en/samples.html | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) (limited to 'html/en/samples.html') 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 @@ 
cdCanvas* canvas = cdCreateCanvasf(CD_IMAGERGB, "%dx%d", width, height);
 cdCanvasLineStyle(canvas, CD_DASHED); 
 cdCanvasLine(canvas, 10, 10, 50, 50); 
-unsigned char* red = cdCanvasGetAttribute(canvas, "REDIMAGE");
-// do something with the raw image data
-cdKillCanvas(canvas); 
+cdKillCanvas(canvas);
+

To save the contents of the CD_IMAGERGB canvas in a file using IM, after +drawing and before destroying the canvas do:

+
unsigned char* data = cdCanvasGetAttribute(canvas, "REDIMAGE"); // Also a pointer to the full buffer
+imImage* image = imImageInit(width, height, IM_RGB, IM_BYTE, data, NULL, 0); 
+// Can use also IM_RGB|IM_ALPHA is canvas has support for alpha
+imFileImageSave(file_name, "PNG", image);
+image->data[0] = NULL; // to avoid duplicate memory release
+imImageDestroy(image);
+

Or using another approach:

+
imImage* image = imImageCreate(width, height, IM_RGB, IM_BYTE);
+// Can also call imImageAddAlpha if alpha support is wanted
+
+cdCanvas* canvas = cdCreateCanvasf(CD_IMAGERGB, "%dx%d %p %p %p", width, height, 
+                                   image->data[0], image->data[1], image->data[2]);
+cdCanvasLineStyle(canvas, CD_DASHED); 
+cdCanvasLine(canvas, 10, 10, 50, 50); 
+cdKillCanvas(canvas);
+
+imFileImageSave(file_name, "PNG", image);
+imImageDestroy(image);
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