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140 lines
6.4 KiB
HTML
140 lines
6.4 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<link href="main.css" rel="stylesheet" type="text/css" />
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<title>Visualizations - 6502bench SourceGen</title>
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</head>
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<body>
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<div id="content">
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<h1>6502bench SourceGen: Visualizations</h1>
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<p><a href="index.html">Back to index</a></p>
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<h2><a name="overview">Overview</a></h2>
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<p>Programs are generally a combination of code and data. Sometimes
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the data is graphical in nature, e.g. a bitmap used as a font or
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game sprite. Being able to see the data in graphic form can make it
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easier to determine the purpose of associated code.</p>
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<p>While modern systems use GIF, JPEG, and PNG to hold 2D bitmaps,
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graphical elements embedded in 6502 applications are almost always
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in a platform-specific form. For this reason, the task of generating
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images from data is performed by
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<a href="advanced.html#extension-scripts">extension scripts</a>. Some
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scripts for common formats are included in the SourceGen runtime directory.
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If these don't do what you need, you can write your own scripts and
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include them in your project.</p>
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<p>The project file doesn't store the converted graphics. Instead, the
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project file holds a string that identifies the converter, and a list of
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parameters that are passed to the converter. Images are generated when
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the project is first opened, and updated if the set of loaded extension
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scripts changes.</p>
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<p>Visualizations are not included in generated assembly output. They
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may be included in HTML exports.</p>
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<h2><a name="vis-and-sets">Visualizations and Visualization Sets</a></h2>
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<p>Visualizations are essentially decorative: they do not affect the
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assembled output, and do not change how code is analyzed. They are
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contained in sets that are placed at arbitrary offsets. Each set can
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contain multiple items. For example, if a file has data for
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10 bitmaps, you can place a visualization near each, or create a single
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visualization set with all 10 items and put it at the start of the file.</p>
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<p>To create a visualization set, select a code or data line, and use
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Actions > Create/Edit Visualization Set. To edit a visualization set,
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select it and use the same menu item, or just double-click on it. This
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opens the Visualization Set Editor window.</p>
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<p>The visualization set editor shows a list of visualizations associated
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with the selected file offset. You can create a new visualization, edit
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or remove an existing entry, or rearrange them.
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If you select "New Bitmap" or edit an existing bitmap entry, the
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Bitmap Visualization Editor window will open.</p>
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<h4>Bitmap Visualization Editor</h4>
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<p>The combo box at the top of the screen lists every bitmap visualization
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generator defined by an active extension script. Select the one that is
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appropriate for the data you're trying to visualize. Every visualizer may
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have different parameters, so as you select different entries the set of
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input parameters below the preview window may change.</p>
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<p>The "tag" is a unique string that will be shown in the display list.
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This is not a label, and may contain any characters you want (but leading
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and trailing whitespace will be trimmed). The only requirement is that
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it be unique among visualization tags.</p>
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<p>The preview window shows the visualizer output. The generated image is
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expanded to fill the window, so small images will be shown with very
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large pixels.
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If you resize the editor window, the preview window will expand, which
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can make it easier to see detail on larger images.
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If the generator fails, the preview window will show a red 'X', and an
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error message will appear below it.</p>
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<p>Parameters may be numeric or boolean. The latter use a simple checkbox,
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the former a text entry field that accepts decimal and hexadecimal values.
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The range of allowable values is shown to the right of the entry field.
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If you enter an invalid value, the parameter description will turn red.</p>
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<h2><a name="runtime">Scripts Included with SourceGen</a></h2>
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<p>A number of visualization generation scripts are included with
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SourceGen, in the platform-specific runtime data directories.</p>
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<p>Most generators will take the file offset, bitmap width, and bitmap
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height as parameters. Offsets are handled as they are elsewhere, i.e.
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always in hexadecimal, with a leading '+'.
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Some less-common parameters include:</p>
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<ul>
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<li><b>Row stride</b> - number of bytes used to hold a row. This
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is used when a row has padding on the end, e.g. a bitmap that's
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7 bytes wide might be padded to 8 for easy indexing. If you set
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this to zero the visualizer will default to no padding
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(stride == width).</li>
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<li><b>Column stride</b> - number of bytes used to hold a column.
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This is uncommon, but could be used if (say) a pair of bitmaps
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was stored with interleaved bytes. If you set this to zero the
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visualizer will default to no interleave (stride == 1).</li>
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</ul>
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<h3>Apple II - VisHiRes</h3>
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<p>There is no standard format for small hi-res bitmaps, but certain
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arrangements are common. The script defines three generators:</p>
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<ul>
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<li><b>Hi-Res Bitmap</b> - converts an MxN row-major bitmap.</li>
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<li><b>Hi-Res Bitmap Font</b> - converts a series of MxN row-major
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bitmaps. This is intended for hi-res fonts, which are typically
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8 bytes per entry, stored one after another. These are always
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converted as monochrome, and have a 1-pixel transparent gap
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between elements.</li>
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<li><b>Hi-Res Screen Image</b> - used for 8KiB screen images. The
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data is linearized and converted to a 280x192 bitmap.</li>
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</ul>
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<p>Widths are specified in bytes, not pixels. Each byte represents 7
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pixels (with some hand-waving).</p>
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<p>In addition to offset, dimensions, and stride values, the bitmap
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converter has a checkbox for monochrome or color, and a checkbox that
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will cause the first byte to be treated as an odd column rather than
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an event one. The odd/even setting affects green/purple and orange/blue,
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but has no effect on black or white.</p>
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<p>The converter generates one output pixel for every source pixel, so
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half-pixel shifts are not rendered.</p>
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</div>
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<div id="footer">
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<p><a href="index.html">Back to index</a></p>
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</div>
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</body>
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<!-- Copyright 2019 faddenSoft -->
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</html>
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