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Added some information found while writing BPicture, TPicture and ServerPicture

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git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3992 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Marc Flerackers 2003-07-16 14:43:27 +00:00
parent ce072df2d0
commit e793a55e78
1 changed files with 16 additions and 9 deletions
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25
docs/develop/interface/BPicture_specifications.html
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@ -9,8 +9,12 @@
content="BPicture specifications for OpenBeOS">
</head>
<body>
<span style="font-weight: bold; text-decoration: underline;">Picture
data</span><br>
<span style="font-weight: bold; text-decoration: underline;"></span>Author:
Marc Flerackers<br>
Revision: 1.4<br>
<span style="font-weight: bold; text-decoration: underline;"></span><span
style="font-weight: bold; text-decoration: underline;"><br>
Picture data</span><br>
<br>
The data of a BPicture is composed of instructions.<br>
<br>
@ -185,7 +189,7 @@ float deltay<br>
<td valign="top">0x0110 </td>
<td valign="top">DrawPixels<br>
</td>
<td valign="top">52 + pixel data size<br>
<td valign="top">56 + pixel data size<br>
</td>
<td valign="top">BRect src<br>
BRect dest<br>
@ -194,6 +198,7 @@ int32 height<br>
int32 bytesPerRow<br>
int32 pixelFormat<br>
int32 flags<br>
int32 length of pixel data<br>
pixel data<br>
</td>
</tr>
@ -512,17 +517,19 @@ There are a few undocumented instructions:<br>
<td valign="top">SetFontBPP </td>
<td valign="top">4<br>
</td>
<td valign="top"> int32 bpp </td>
<td valign="top"> int32 bpp (default 8)<br>
</td>
</tr>
</tbody>
</table>
<br>
Also, not all instructions where checked yet. The SetClippingRects and
DrawPixels data has still to be documented.<br>
Not all instructions where checked yet. The SetClippingRects has still
to be documented.<br>
<br>
Regarding DrawPicture and ClipToPicture, it seems the pictures to draw
are not inside the flattened data, instead they are stored as messages
in the BMessage in a field called "piclib".<br>
DrawPicture and ClipToPicture have an index to the sub-picture. In
flattened data, these sub-pictures are stored in front of the main
picture data, when archived to a BMessage, the sub-pictures are
contained in a field called "piclib".<br>
<br>
<span style="font-weight: bold; text-decoration: underline;">Shape data</span><br>
<br>