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* art_render.h: Modular rendering architecture.
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* Libart_LGPL - library of basic graphic primitives
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* Copyright (C) 2000 Raph Levien
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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#ifndef __ART_RENDER_H__
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#define __ART_RENDER_H__
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#ifdef LIBART_COMPILATION
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#include "art_alphagamma.h"
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#include <libart_lgpl/art_alphagamma.h>
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#endif /* __cplusplus */
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#define ART_MAX_DEPTH 16
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#if ART_MAX_DEPTH == 16
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typedef art_u16 ArtPixMaxDepth;
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#define ART_PIX_MAX_FROM_8(x) ((x) | ((x) << 8))
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#define ART_PIX_8_FROM_MAX(x) (((x) + 0x80 - (((x) + 0x80) >> 8)) >> 8)
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#if ART_MAX_DEPTH == 8
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typedef art_u8 ArtPixMaxDepth;
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#define ART_PIX_MAX_FROM_8(x) (x)
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#define ART_PIX_8_FROM_MAX(x) (x)
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#error ART_MAX_DEPTH must be either 8 or 16
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#define ART_MAX_CHAN 16
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typedef struct _ArtRender ArtRender;
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typedef struct _ArtRenderCallback ArtRenderCallback;
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typedef struct _ArtRenderMaskRun ArtRenderMaskRun;
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typedef struct _ArtImageSource ArtImageSource;
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typedef struct _ArtMaskSource ArtMaskSource;
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ART_ALPHA_SEPARATE = 1,
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ART_COMPOSITE_MULTIPLY,
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ART_IMAGE_SOURCE_CAN_CLEAR = 1,
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ART_IMAGE_SOURCE_CAN_COMPOSITE = 2
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} ArtImageSourceFlags;
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struct _ArtRenderMaskRun {
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struct _ArtRenderCallback {
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void (*render) (ArtRenderCallback *self, ArtRender *render,
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void (*done) (ArtRenderCallback *self, ArtRender *render);
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struct _ArtImageSource {
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ArtRenderCallback super;
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void (*negotiate) (ArtImageSource *self, ArtRender *render,
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ArtImageSourceFlags *p_flags,
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int *p_buf_depth, ArtAlphaType *p_alpha_type);
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struct _ArtMaskSource {
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ArtRenderCallback super;
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int (*can_drive) (ArtMaskSource *self, ArtRender *render);
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/* For each mask source, ::prepare() is invoked if it is not
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a driver, or ::invoke_driver() if it is. */
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void (*invoke_driver) (ArtMaskSource *self, ArtRender *render);
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void (*prepare) (ArtMaskSource *self, ArtRender *render, art_boolean first);
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/* parameters of destination image */
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ArtAlphaType alpha_type;
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ArtPixMaxDepth clear_color[ART_MAX_CHAN + 1];
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art_u32 opacity; /* [0..0x10000] */
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ArtCompositingMode compositing_mode;
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ArtAlphaGamma *alphagamma;
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/* parameters of intermediate buffer */
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ArtAlphaType buf_alpha;
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/* driving alpha scanline data */
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/* A "run" is a contiguous sequence of x values with the same alpha value. */
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ArtRenderMaskRun *run;
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/* A "span" is a contiguous sequence of x values with non-zero alpha. */
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art_boolean need_span;
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art_render_new (int x0, int y0, int x1, int y1,
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art_u8 *pixels, int rowstride,
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int n_chan, int depth, ArtAlphaType alpha_type,
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ArtAlphaGamma *alphagamma);
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art_render_invoke (ArtRender *render);
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art_render_clear (ArtRender *render, const ArtPixMaxDepth *clear_color);
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art_render_clear_rgb (ArtRender *render, art_u32 clear_rgb);
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art_render_mask_solid (ArtRender *render, int opacity);
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art_render_image_solid (ArtRender *render, ArtPixMaxDepth *color);
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/* The next two functions are for custom mask sources only. */
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art_render_add_mask_source (ArtRender *render, ArtMaskSource *mask_source);
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art_render_invoke_callbacks (ArtRender *render, art_u8 *dest, int y);
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/* The following function is for custom image sources only. */
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art_render_add_image_source (ArtRender *render, ArtImageSource *image_source);
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#endif /* __cplusplus */
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#endif /* __ART_RENDER_H__ */