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186 lines
6.6 KiB
C
186 lines
6.6 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/*
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* ni_pixmp.h --- Cross platform pixmap data structure.
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* $Id: ni_pixmp.h,v 3.2 1998/07/27 16:09:11 hardts%netscape.com Exp $
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*/
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#ifndef _NI_PIXMAP_H
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#define _NI_PIXMAP_H
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#include "xp_mem.h"
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/************** Colorimetry/Gamma Correction Information. ********************
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* This doesn't need to be implemented initially, but it's here for future *
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* usage. */
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/* The chrominance part of a CIE xyY color specification */
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typedef struct CIEchroma {
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float x;
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float y;
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} CIEchroma;
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/* Define a device-independent color space using the white point and
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primary colors of a gamut formed by RGB tristimulus values. */
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typedef struct NI_RGBColorSpace {
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CIEchroma white_point;
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CIEchroma primary_red;
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CIEchroma primary_green;
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CIEchroma primary_blue;
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} NI_RGBColorSpace;
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typedef struct NI_ColorSpec {
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double gamma;
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NI_RGBColorSpace rgb_colorspace;
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} NI_ColorSpec;
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/***************** Colorspace and Colormap Information ***********************/
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/* Possible colorspace types. */
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typedef enum _NI_ColorSpaceType
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{
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NI_TrueColor = 0x01, /* RGB data. */
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NI_PseudoColor = 0x02, /* Indexed data. */
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NI_GreyScale = 0x04 /* Greyscale data. */
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} NI_ColorSpaceType;
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/* RGB bit allocation and offsets. */
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typedef struct _NI_RGBBits {
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uint8 red_bits; /* Number of bits assigned to red channel. */
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uint8 red_shift; /* Offset for red channel bits. */
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uint8 green_bits; /* Number of bits assigned to green channel. */
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uint8 green_shift; /* Offset for green channel bits. */
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uint8 blue_bits; /* Number of bits assigned to blue channel. */
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uint8 blue_shift; /* Offset for blue channel bits. */
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} NI_RGBBits;
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/* An indexed RGB triplet. */
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typedef struct _NI_IRGB {
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uint8 index;
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uint8 red, green, blue;
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} NI_IRGB;
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/* A RGB triplet representing a single pixel in the image's colormap
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(if present.) */
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typedef struct _NI_RGB
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{
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uint8 red, green, blue, pad; /* Windows requires the fourth byte &
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many compilers pad it anyway. */
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uint16 hist_count; /* Histogram frequency count. */
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} NI_RGB;
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/* Colormap information. */
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typedef struct _NI_ColorMap {
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int32 num_colors; /* Number of colors in the colormap.
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A negative value can be used to denote a
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possibly non-unique set. */
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NI_RGB *map; /* Colormap colors. */
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uint8 *index; /* NULL, if map is in index order. Otherwise
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specifies the indices of the map entries. */
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void *table; /* Lookup table for this colormap. Private to
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the Image Library. */
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} NI_ColorMap;
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/* Special purpose flags for OS-specific problems. */
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typedef enum {
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WIN95_ROUNDING = 0x01 /* Windows 95 color quantization bug. */
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} NI_OSFlags;
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/* Colorspace information. */
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typedef struct _NI_ColorSpace {
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NI_ColorSpaceType type; /* NI_Truecolor, NI_Pseudocolor or
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NI_Greyscale. */
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/* The dimensions of the colorspace. */
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union {
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NI_RGBBits rgb; /* For TrueColor. */
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uint8 index_depth; /* For PseudoColor and GreyScale. */
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} bit_alloc; /* Allocation of bits. */
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uint8 pixmap_depth; /* Total bit depth (including alpha or pad.) */
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/* Colormap information. This may be used for one of three purposes:
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- If the colorspace belongs to a PseudoColor source image, then the
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colormap represents the mapping from the source image indices to
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the corresponding RGB components.
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- If the colorspace belongs to a TrueColor source image, then a
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colormap may be provided as a suggested palette for displaying the
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image on PseudoColor displays.
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- If the colorspace belongs to a PseudoColor Display Front End or a
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destination image for a PseudoColor Display Front End, then the
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colormap represents the mapping from the display's palette indices
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to the corresponding RGB components. */
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NI_ColorMap cmap;
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/* Image Library private data for this colorspace. */
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void *private_data;
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/* Special purpose flags for OS-specific problems. */
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uint8 os_flags; /* Flags are of type NI_OSFlags. */
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/* Reference counter. */
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uint32 ref_count;
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} NI_ColorSpace;
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/* A pixmap's header information. */
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typedef struct _NI_PixmapHeader
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{
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/* Size. */
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uint32 width; /* Width. */
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uint32 height; /* Height. */
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uint32 widthBytes; /* width * depth / 8. May be aligned for
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optimizations. */
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/* Colorspace. */
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NI_ColorSpace *color_space; /* Colorspace and colormap information. */
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/* Transparency. */
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NI_IRGB *transparent_pixel; /* The image's transparent pixel
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(if present.) */
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uint8 alpha_bits; /* Number of bits assigned to alpha channel. */
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uint8 alpha_shift; /* Offset for alpha channel bits. */
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int32 is_interleaved_alpha; /* Is alpha channel interleaved with
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image data? */
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/* Gamma/color correction. */
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NI_ColorSpec color_spec;
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} NI_PixmapHeader;
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/* A pixmap. */
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typedef struct _NI_Pixmap
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{
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NI_PixmapHeader header; /* Header information. */
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void XP_HUGE *bits; /* Pointer to the bits. */
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void *client_data; /* Pixmap-specific data opaque to the Image
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Library e.g. display front-ends which
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support scaling may use this to store the
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actual size at which the image is to be
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displayed. */
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} NI_Pixmap;
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#endif /* _NI_PIXMAP_H */
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