diff options
authorRichard Wilson <>2004-08-08 20:17:23 +0000
committerRichard Wilson <>2004-08-08 20:17:23 +0000
commit38c79fa1cdadf1fb545c51b1a0b69506ce76b0fa (patch)
parentafa046e1be4d01acdc035fbec2dab530c9e48abe (diff)
[project @ 2004-08-08 20:17:23 by rjw]
Removal of Tinct and documentation. Now available at svn path=/import/netsurf/; revision=1197
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-This module provides the necessary functionality to display alpha-blended
-sprites both scaled and otherwise. It also provides functions for dithering
-and performing bi-linear filtering to improve their appearance.
-Technical information
-To ensure future compatibility, this module does not patch the OS in any way
-and works in a totally legal way. It also does not write to itself in any
-way, so is suitable for running from ROM.
- Redirection to sprites is supported, although due to the overheads involved
-with caching the colour translation tables it is not recommended that this is
-done frequently. There are some exceptions to this, however, as redirecting to
-a 16bpp or 32bpp mode sprite does not require any translation tables, and
-redirecting to a sprite that has the same mode and palette as the previous
-destination that Tinct was used for causes a minimum overhead as the
-translation tables are checked and cached values are used if possible.
-Format of a sprite with 8-bit alpha channel
-The sprite format used by Tinct differs from those used by RISC OS Select,
-and whilst facilities are supplied to convert sprites into the required format,
-no facilities are provided to manipulate them.
- All sprites used by Tinct must be 32bpp, and cannot have a standard RISC OS
-mask specified. The basic format of the sprite is shown below, with the
-restrictions to the standard sprite format marked with an asterisk (*):
- [+0] Offset to next sprite
- [+4] Sprite name, up to 12 characters with trailing zeroes
- [+16] Width in words - 1
- [+20] Height in scan lines - 1
- [+24] First bit used
- [+28] Last bit used
- [+32] Offset to sprite image
- [+36] * Offset to sprite image (no mask allowed)
- [+40] * Sprite type (must be 0x301680B5)
-Whereas for normal sprites the sprite image would be a series of colour words
-of the format RrGgBb00, alpha-blended sprites use the empty byte to specify
-the alpha value, ie RrGgBbAa.
- The alpha values represent the blending level on a linear scale where 0x00
-represents that the source pixel is totally transparent and 0xff that it is
-totally opaque. It should be noted that as a standard 32bpp sprite (eg as
-created with !Paint) will have the alpha channel set to 0x00 by default no
-output will be visible when plotting as an alpha-blended sprite.
-Error handling
-If an incorrect sprite is attempted to be used, Tinct currently always returns
-error number 0x700 (SBadSpriteFile) rather than the specific cause of the
-problem (eg. BadDPI, BadMSFlags or BadPixelDepth) as OS_SpriteOp would do.
-There are several technical reasons for this behaviour, and future versions of
-Tinct may return more descriptive errors depending on the cause.
-SWIs provided
-Tinct provides four SWIs to plot sprites and one to convert sprites to their
-32bpp equivalent. All values supplied to Tinct must be in OS units, and the
-current OS clipping rectangle is used.
- The sprite pointers provided are equivalent to calling OS_SpriteOp with
-bit 9 of the reason code set. To plot a sprite by name, the sprite should
-first be found by using OS_SpriteOp with reason code 0x18 and using the
-returned sprite address.
-Tinct_PlotAlpha (0x57240)
-Plots an alpha-blended sprite at the specified coordinates.
--> R2 Sprite pointer
- R3 X coordinate
- R4 Y coordinate
- R7 Flag word
-Tinct_PlotScaledAlpha (0x57241)
-Plots a scaled alpha-blended sprite at the specified coordinates.
--> R2 Sprite pointer
- R3 X coordinate
- R4 Y coordinate
- R5 Scaled sprite width
- R6 Scaled sprite height
- R7 Flag word
-Tinct_Plot (0x57242)
-Plots a sprite at the specified coordinates with a constant 0xff value for
-the alpha channel, ie without a mask.
--> R2 Sprite pointer
- R3 X coordinate
- R4 Y coordinate
- R7 Flag word
-Tinct_PlotScaled (0x57243)
-Plots a scaled sprite at the specified coordinates with a constant 0xff value
-for the alpha channel, ie without a mask.
--> R2 Sprite pointer
- R3 X coordinate
- R4 Y coordinate
- R5 Scaled sprite width
- R6 Scaled sprite height
- R7 Flag word
-Tinct_ConvertSprite (0x57244)
-Converts a paletted sprite into its 32bpp equivalent. Sufficient memory must
-have previously been allocated for the sprite (44 + width * height * 4).
- As sprites with 16bpp or 32bpp do not have palettes, conversion cannot be
-performed on these variants. All sprites must be supplied with a full palette,
-eg 8bpp must have 256 palette entries.
--> R2 Source sprite pointer
- R3 Destination sprite pointer
-Tinct_AvailableFeatures (0x57245)
-Returns the features available to the caller by specifying bits in the flag
-word. The features available are unique for each mode, although the current
-version of Tinct supports the same subset of features for all modes.
--> R0 Feature to test for, or 0 for all features
-<- R0 Features available
-Flag word
-All the SWIs provided by Tinct for plotting use a common flag word to
-describe the manner in which the plot is performed. Each bit controls a
-particular characteristic of the plotting:
- 0 Forcibly read the screen base (only use if hardware scrolling)
- 1 Use bi-linear filtering when scaling sprites
- 2 Dither colours in 16bpp and below
- 3 Invert dither pattern
- 4 Horizontally fill the current graphics window with the sprite
- 5 Vertically fill the current graphics window with the sprite
- 6 Forcibly read the palette (only use if changing palette outside of
- the WIMP)
- 7+ Reserved (must be 0)
-If a bit is set in the flag word that cannot be honoured by the current
-version of Tinct then it is ignored. Tinct_AvailableFeatures can be used
-to test in advance what flags will be honoured.
-Bilinear filtering
-Although bi-linear filtering is only relevant during scaled plotting, this
-situation occurs when the EigFactors of the mode are not equal. As such, an
-application should always set their preferred flags to ensure consistency.
-Sprite filling
-If filling is specified, then the supplied co-ordinate is the offset of the
-pattern relative to (0, 0) used for the fill. For example, a 64x64 sprite that
-is plotted with bits 4 and 5 set and a position of (32, 16) would fill the
-current graphics window with multiple copies of the image stating with the
-first image plotted at (-32, -48).
-Contact details
-If you would like to report a problem relating to Tinct, provide feedback, or
-request a licence for a commercial product, please use the details below:
-Address: 5 Queens Close, East Markham, Newark, Nottinghamshire, NG22 0QY. UK
-Copyright and licence details
-Tinct is İ copyright Richard Wilson, 2004.
-Distribution and usage
-Unrestricted use of Tinct is hereby granted for any non-commercial product. Any
-use as part of a commercial product requires written consent from the author.
-No charge may be made relating to the distribution of this software, and this
-file should be included in all copies of the software.
- Modified versions of this program may not be distributed without the authors
-consent, nor may modified versions of the source code or relating files. \ No newline at end of file