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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
/* FreeSCI 0.3.1+ graphics subsystem helper functions */
#ifndef _GFX_TOOLS_H_
#define _GFX_TOOLS_H_
#include "sci/gfx/gfx_system.h"
#include "sci/gfx/gfx_driver.h"
namespace Sci {
typedef enum {
GFX_XLATE_FILTER_NONE,
GFX_XLATE_FILTER_LINEAR,
GFX_XLATE_FILTER_TRILINEAR
} gfx_xlate_filter_t;
typedef enum {
GFXR_ANTIALIASING_NONE,
GFXR_ANTIALIASING_SIMPLE
} gfxr_antialiasing_t;
extern int gfx_crossblit_alpha_threshold; /* Crossblitting functions use this value as threshold
** for distinguishing between transparent and opaque
** wrt alpha values */
gfx_mode_t *gfx_new_mode(int xfact, int yfact, int bytespp, unsigned int red_mask, unsigned int green_mask,
unsigned int blue_mask, unsigned int alpha_mask, int red_shift, int green_shift,
int blue_shift, int alpha_shift, int palette, int flags);
/* Allocates a new gfx_mode_t structure with the specified parameters
** Parameters: (int x int) xfact x yfact: Horizontal and vertical scaling factors
** (int) bytespp: Bytes per pixel
** (unsigned int) red_mask: Red bit mask
** (unsigned int) green_mask: Green bit mask
** (unsigned int) blue_mask: Blue bit mask
** (unsigned int) Alpha_mask: Alpha bit mask, or 0 if the alpha channel is not supported
** (int) red_shift: Red shift value
** (int) green_shift: Green shift value
** (int) blue_shift: Blue shift value
** (int) alpha_shift: Alpha shift value
** (int) palette: Number of palette colors, 0 if we're not in palette mode
** (int) flags: GFX_MODE_FLAG_* values ORred together, or just 0
** Returns : (gfx_mode_t *) A newly allocated gfx_mode_t structure
*/
void gfx_clip_box_basic(rect_t *box, int maxx, int maxy);
/* Clips a rect_t
** Parameters: (rect_t *) box: Pointer to the box to clip
** (int x int) maxx, maxy: Maximum allowed width and height
** Returns : (void)
*/
void gfx_free_mode(gfx_mode_t *mode);
/* Frees all memory allocated by a mode structure
** Parameters: (gfx_mode_t *) mode: The mode to free
** Returns : (void)
*/
gfx_pixmap_t *gfx_new_pixmap(int xl, int yl, int resid, int loop, int cel);
/* Creates a new pixmap structure
** Parameters: (int x int) xl x yl: The dimensions (in SCI coordinates) of the pixmap
** (int) resid: The pixmap's resource ID, or GFX_RESID_NONE
** (int) loop: For views: The pixmap's loop number
** (int) cel: For cels: The pixmap's cel number
** Returns : (gfx_pixmap_t *) The newly allocated pixmap
** The following fiels are initialized:
** ID, loop, cel, index_xl, index_yl, xl, yl, data <- NULL,
** alpha_map <- NULL, internal.handle <- 0, internal.info <- NULL, colors <- NULL,
** index_scaled <- 0
*/
gfx_pixmap_t *gfx_clone_pixmap(gfx_pixmap_t *pixmap, gfx_mode_t *mode);
/* Clones a pixmap, minus its index data, palette and driver-specific handles
** Parameters: (gfx_pixmap_t *) pixmap: The pixmap to clone
** (gfx_mode_t *) mode: The mode to be applied to the pixmap
** Returns : (gfx_pixmap_t *) The clone
*/
gfx_pixmap_t *gfx_pixmap_alloc_index_data(gfx_pixmap_t *pixmap);
/* Allocates the index_data field of a pixmap
** Parameters: (gfx_pixmap_t *) pixmap: The pixmap to allocate for
** Returns : (gfx_pixmap_t *) pixmap
*/
gfx_pixmap_t *gfx_pixmap_free_index_data(gfx_pixmap_t *pixmap);
/* Frees the index_data field of a pixmap
** Parameters: (gfx_pixmap_t *) pixmap: The pixmap to modify
** Returns : (gfx_pixmap_t *) pixmap
*/
gfx_pixmap_t *gfx_pixmap_alloc_data(gfx_pixmap_t *pixmap, gfx_mode_t *mode);
/* Allocates the data field of a pixmap
** Parameters: (gfx_pixmap_t *) pixmap: The pixmap to allocate for
** (gfx_mode_t *) mode: The mode the memory is to be allocated for
** Returns : (gfx_pixmap_t *) pixmap
*/
gfx_pixmap_t *gfx_pixmap_free_data(gfx_pixmap_t *pixmap);
/* Frees the memory allocated for a pixmap's data field
** Parameters: (gfx_pixmap_t *) pixmap: The pixmap to modify
** Returns : (gfx_pixmap_t *) pixmap
*/
void gfx_free_pixmap(gfx_driver_t *driver, gfx_pixmap_t *pxm);
/* Frees all memory associated with a pixmap
** Parameters: (gfx_driver_t *) driver: The driver the pixmap is to be removed from
** (gfx_pixmap_t *) pxm: The pixmap to free
** Returns : (void)
*/
void gfx_draw_line_pixmap_i(gfx_pixmap_t *pxm, Common::Point start, Common::Point end, int color);
/* Draws a line to a pixmap's index data buffer
** Parameters: (gfx_pixmap_t *) pxm: The pixmap to draw to
** (Common::Point) start: Starting point of the line to draw
** (Common::Point) end: End point of the line to draw
** (int) color: The byte value to write
** Returns : (void)
** Remember, this only draws to the /index/ buffer, not to the drawable buffer.
** The line is not clipped. Invalid x, y, x1, y1 values will result in memory corruption.
*/
void gfx_draw_line_buffer(byte *buffer, int linewidth, int pixelwidth,
Common::Point start, Common::Point end, unsigned int color);
/* Draws a line to a linear pixel buffer
** Parameters: (byte *) buffer: Pointer to the start of the buffer to draw to
** (int) linewidth: Number of bytes per pixel line in the buffer
** (int) pixelwidth: Number of bytes per pixel
** (Common::Point) start: Starting point of the line to draw
** (Common::Point) end: End point of the line to draw
** (rect_t) Coordinates: the line should be drawn to (must be clipped already)
** xl and yl describe relative offsets, as usual.
** (unsigned int) color: The color to draw (only the lowest 8 * pixelwidth bits are relevant)
** Returns : (void)
** This function assumes 1 <= pixelwidth <= 4
*/
void gfx_draw_box_pixmap_i(gfx_pixmap_t *pxm, rect_t box, int color);
/* Draws a filled rectangular area to a pixmap's index buffer
** Parameters: (gfx_pixmap_t *) pxm: The pixmap to draw to
** (rect_t) box: The box to fill
** (int) color: The color to use for drawing
** Returns : (void)
** This function only draws to the index buffer.
*/
void gfx_copy_pixmap_box_i(gfx_pixmap_t *dest, gfx_pixmap_t *src, rect_t box);
/* Copies part of a pixmap to another pixmap, with clipping
** Parameters: (gfx_pixmap_t *) dest: The destination pixmap
** (gfx_pixmap_t *) src: The source pixmap
** (rect_t) box: The area to copy
** Returns : (void)
*/
void gfx_xlate_pixmap(gfx_pixmap_t *pxm, gfx_mode_t *mode, gfx_xlate_filter_t filter);
/* Translates a pixmap's index data to drawable graphics data
** Parameters: (gfx_pixmap_t *) pxm: The pixmap to translate
** (gfx_mode_t *) mode: The mode according which to scale
** (gfx_xlate_filter_t) filter: How to filter the data
** Returns : (void)
*/
void gfxr_antialiase(gfx_pixmap_t *pixmap, gfx_mode_t *mode, gfxr_antialiasing_t type);
/* Performs antialiasing on a pixmap
** Parameters: (gfx_pixmap_t *) pixmap: The pixmap to antialiase
** (gfx_mode_t *) mode: The current mode
** (gfxr_antialiasing_t) type: Antialiasing algorithm to use
** Returns : (void)
*/
#define GFX_CROSSBLIT_FLAG_DATA_IS_HOMED (1<<0)
/* Means that the first byte in the visual data refers to the
** point corresponding to (dest.x, dest.y) */
int gfx_crossblit_pixmap(gfx_mode_t *mode, gfx_pixmap_t *pxm, int priority,
rect_t src_coords, rect_t dest_coords, byte *dest, int dest_line_width,
byte *priority_dest, int priority_line_width, int priority_skip, int flags);
/* Transfers the non-transparent part of a pixmap to a linear pixel buffer
** Parameters: (gfx_mode_t *) mode: The graphics mode of the target buffer
** (gfx_pixmap_t *) pxm: The pixmap to transfer
** (int priority): The pixmap's priority
** (rect_t) src_coords: The source coordinates within the pixmap
** (rect_t) dest_coords: The destination coordinates (no scaling)
** (byte *) dest: Memory position of the upper left pixel of the
** linear pixel buffer
** (int) dest_line_width: Byte offset of the very first pixel in the
** second line of the linear pixel buffer,
** relative to dest.
** (byte *) priority_dest: Destination buffer for the pixmap's priority
** values
** (int) priority_line_width: Byte offset of the first pixel in the
** second line of the priority buffer
** (int) priority_skip: Amount of bytes allocated by each priority value
** (int) flags: Any crossblit flags
** Returns : (int) GFX_OK, or GFX_ERROR if the specified mode was invalid or unsupported
** A 'linear buffer' in this context means a data buffer containing an entire
** screen (visual or priority), with fixed offsets between each data row, and
** linear access.
*/
int gfx_alloc_color(gfx_palette_t *pal, gfx_pixmap_color_t *color);
/* Allocates a color entry for the specified pixmap color
** Parameters: (gfx_palette_t *) pal: The palette structure the color should be allocated in
** (gfx_pixmap_color_t *) color: The color to allocate
** Returns : (int) GFX_ERROR if any error occured, GFX_OK if the color could be mapped to an
** existing color or a positive value if a new color was allocated in the
** palette.
*/
int gfx_free_color(gfx_palette_t *pal, gfx_pixmap_color_t *color);
/* Frees the color entry allocated for the specified pixmap color
** Parameters: (gfx_palette_t *) pal: The palette structure the color was previously allocated in
** (gfx_pixmap_color_t *) color: The color to free
** Returns : (int) GFX_ERROR if any error occured, GFX_OK otherwise
*/
gfx_pixmap_t *gfx_pixmap_scale_index_data(gfx_pixmap_t *pixmap, gfx_mode_t *mode);
/* Scales the index data associated with a pixmap
** Parameters: (gfx_pixmap_t *) pixmap: The pixmap whose index data should be scaled
** (gfx_mode_t *) mode: The mode to scale it to
** Returns : (gfx_pixmap_t *) pixmap
*/
} // End of namespace Sci
#endif /* !_GFX_TOOLS_H_ */
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