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202 lines
5.0 KiB
202 lines
5.0 KiB
15 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<title>KSquirrel: development</title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name='Author' content='Baryshev Dmitry/Krasu'>
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<link rel="stylesheet" href="styles.css" type="text/css">
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</head>
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<body>
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In ksquirrel-libs I use the following wrappers for built-in types (valid for x86, 32-bit platform): int - <b>s32</b>,
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unsigned int - <b>u32</b>, short - <b>s16</b>, unsigned short - <b>u16</b>, char - <b>s8</b>, unsinged char - <b>u8</b>.
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All of them are defined in <b>fmt_types.h</b>.
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<pre>
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<b>Defines one metainfo record. For example:
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{"JPEG 'COM' marker", "File written by Photoshop"}</b>
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struct fmt_metaentry
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{
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<b>Group name, for example "SGI Image name"</b>
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std::string group;
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<b>Information. For example "This image was created with MegaTool 0.5.1"</b>
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std::string data;
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};
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<b>Defines 32-bit pixel. Red, Green, Blue and Alpha channel.</b>
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struct RGBA
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{
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RGBA() : r(0), g(0), b(0), a(0)
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{}
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RGBA(s32 r1, s32 g1, s32 b1, s32 a1) : r(r1), g(g1), b(b1), a(a1)
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{}
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u8 r;
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u8 g;
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u8 b;
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u8 a;
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}PACKED;
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<b>Defines 24-bit color pixel. Red, Green, Blue.</b>
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struct RGB
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{
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RGB() : r(0), g(0), b(0)
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{}
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RGB(s32 r1, s32 g1, s32 b1) : r(r1), g(g1), b(b1)
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{}
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u8 r;
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u8 g;
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u8 b;
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}PACKED;
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<b>Defines one image. It stores the main information about one image: width,
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height, metainfo, ...</b>
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struct fmt_image
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{
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fmt_image() : w(0), h(0), bpp(0), hasalpha(false), needflip(false),
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delay(0), interlaced(false), passes(1)
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{}
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<b>width of the image</b>
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s32 w;
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<b>height</b>
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s32 h;
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<b>bits per pixel</b>
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s32 bpp;
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<b>has alpha channel ?</b>
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bool hasalpha;
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<b>flip ? (for example BMP needs)</b>
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bool needflip;
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<b>only for animated images (like GIF)</b>
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s32 delay;
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<b>Is it interlaced or normal ?</b>
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bool interlaced;
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<b>Item 'passes' stores a number of passes if the image is iterlaced, or 1 otherwise.</b>
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s32 passes;
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<b>color space (RGB, RGBA, CMYK, LAB ...)</b>
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std::string colorspace;
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<b>compression type (RLE, JPEG, Deflate ...)</b>
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std::string compression;
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};
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<b>The main structure in ksquirrel-libs. It contains all information needed
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to decode a file with one or more images.</b>
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struct fmt_info
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{
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fmt_info() : animated(false)
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{}
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<b>Array of fmt_image structures. One structure defines one image.</b>
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std::vector<fmt_image> image;
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<b>Metainfo entries</b>
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std::vector<fmt_metaentry> meta;
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<b>Is it animated or static ?</b>
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bool animated;
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};
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enum fmt_compression {
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<b>No compression</b>
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CompressionNo = 1,
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<b>RLE compression</b>
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CompressionRLE = 2,
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<b>Internal cmpression. E.g. compression_level will be passed to internal routines,
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for example in libjpeg, libpng.
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Note: if the image can be compressed with RLE encoding and with only RLE
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encoding, compression_scheme should be CompressionInternal</b>
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CompressionInternal = 4 };
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<b>Write options for image format</b>
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struct fmt_writeoptionsabs
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{
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<b>Can be interlaced ?</b>
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bool interlaced;
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<b>if interlaced, this value should store preferred number of passes.</b>
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s32 passes;
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<b>if the image should be flipped before writing</b>
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bool needflip;
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<b> with which compression it can be encoded ?
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for example: CompressionNo | CompressionRLE.
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it means, that image can be encoded with RLE
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method or can be saved without any compression.</b>
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s32 compression_scheme;
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<b> minimum compression level, maximum and default.
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For example, JPEG library has minimum = 0,
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maximum = 100 and default = 25.</b>
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s32 compression_min, compression_max, compression_def;
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}PACKED;
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<b>this information will be passed to writing function</b>
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struct fmt_writeoptions
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{
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<b>write interlaced image or normal ?</b>
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bool interlaced;
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<b>with which compression encode the image ?</b>
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fmt_compression compression_scheme;
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<b>compression level</b>
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s32 compression_level;
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<b>has alpha channel ? If no, A channel in RGBA image will be ignored</b>
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bool alpha;
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}PACKED;
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<b>We can use comparison operators for RGBA and RGB pixels. For example:</b>
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<strong>
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#define SQ_NEED_OPERATOR_RGBA_RGB
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RGBA rgba;
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RGB rgb;
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...
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if(rgba == rgb)
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printf("Pixels are equal!\n");
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</strong>
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#if defined SQ_NEED_OPERATOR_RGBA_RGBA
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static s32 operator== (const RGBA &rgba1, const RGBA &rgba2)
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{
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return (rgba1.r == rgba2.r && rgba1.g == rgba2.g && rgba1.b == rgba2.b && rgba1.a == rgba2.a);
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}
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#endif
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#if defined SQ_NEED_OPERATOR_RGB_RGBA
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static s32 operator== (const RGB &rgb, const RGBA &rgba)
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{
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return (rgb.r == rgba.r && rgb.g == rgba.g && rgb.b == rgba.b);
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}
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#endif
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#if defined SQ_NEED_OPERATOR_RGBA_RGB
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static s32 operator== (const RGBA &rgba, const RGB &rgb)
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{
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return (rgba.r == rgb.r && rgba.g == rgb.g && rgba.b == rgb.b);
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}
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#endif
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#endif
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</pre>
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</body>
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</html>
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