forked from KolibriOS/kolibrios
207 lines
7.0 KiB
C
207 lines
7.0 KiB
C
/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
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/* cairo - a vector graphics library with display and print output
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*
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* Copyright (c) 2008 M Joonas Pihlaja
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef CAIRO_SPANS_PRIVATE_H
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#define CAIRO_SPANS_PRIVATE_H
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#include "cairo-types-private.h"
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#include "cairo-compiler-private.h"
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/* Number of bits of precision used for alpha. */
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#define CAIRO_SPANS_UNIT_COVERAGE_BITS 8
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#define CAIRO_SPANS_UNIT_COVERAGE ((1 << CAIRO_SPANS_UNIT_COVERAGE_BITS)-1)
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/* A structure representing an open-ended horizontal span of constant
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* pixel coverage. */
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typedef struct _cairo_half_open_span {
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int32_t x; /* The inclusive x-coordinate of the start of the span. */
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uint8_t coverage; /* The pixel coverage for the pixels to the right. */
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uint8_t inverse; /* between regular mask and clip */
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} cairo_half_open_span_t;
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/* Span renderer interface. Instances of renderers are provided by
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* surfaces if they want to composite spans instead of trapezoids. */
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typedef struct _cairo_span_renderer cairo_span_renderer_t;
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struct _cairo_span_renderer {
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/* Private status variable. */
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cairo_status_t status;
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/* Called to destroy the renderer. */
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cairo_destroy_func_t destroy;
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/* Render the spans on row y of the destination by whatever compositing
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* method is required. */
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cairo_warn cairo_status_t
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(*render_rows) (void *abstract_renderer,
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int y, int height,
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const cairo_half_open_span_t *coverages,
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unsigned num_coverages);
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/* Called after all rows have been rendered to perform whatever
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* final rendering step is required. This function is called just
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* once before the renderer is destroyed. */
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cairo_status_t (*finish) (void *abstract_renderer);
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};
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/* Scan converter interface. */
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typedef struct _cairo_scan_converter cairo_scan_converter_t;
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struct _cairo_scan_converter {
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/* Destroy this scan converter. */
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cairo_destroy_func_t destroy;
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/* Generates coverage spans for rows for the added edges and calls
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* the renderer function for each row. After generating spans the
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* only valid thing to do with the converter is to destroy it. */
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cairo_status_t (*generate) (void *abstract_converter,
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cairo_span_renderer_t *renderer);
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/* Private status. Read with _cairo_scan_converter_status(). */
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cairo_status_t status;
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};
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/* Scan converter constructors. */
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cairo_private cairo_scan_converter_t *
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_cairo_tor_scan_converter_create (int xmin,
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int ymin,
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int xmax,
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int ymax,
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cairo_fill_rule_t fill_rule,
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cairo_antialias_t antialias);
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cairo_private cairo_status_t
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_cairo_tor_scan_converter_add_polygon (void *converter,
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const cairo_polygon_t *polygon);
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cairo_private cairo_scan_converter_t *
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_cairo_tor22_scan_converter_create (int xmin,
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int ymin,
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int xmax,
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int ymax,
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cairo_fill_rule_t fill_rule,
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cairo_antialias_t antialias);
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cairo_private cairo_status_t
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_cairo_tor22_scan_converter_add_polygon (void *converter,
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const cairo_polygon_t *polygon);
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cairo_private cairo_scan_converter_t *
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_cairo_mono_scan_converter_create (int xmin,
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int ymin,
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int xmax,
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int ymax,
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cairo_fill_rule_t fill_rule);
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cairo_private cairo_status_t
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_cairo_mono_scan_converter_add_polygon (void *converter,
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const cairo_polygon_t *polygon);
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cairo_private cairo_scan_converter_t *
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_cairo_clip_tor_scan_converter_create (cairo_clip_t *clip,
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cairo_polygon_t *polygon,
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cairo_fill_rule_t fill_rule,
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cairo_antialias_t antialias);
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typedef struct _cairo_rectangular_scan_converter {
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cairo_scan_converter_t base;
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cairo_box_t extents;
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struct _cairo_rectangular_scan_converter_chunk {
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struct _cairo_rectangular_scan_converter_chunk *next;
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void *base;
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int count;
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int size;
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} chunks, *tail;
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char buf[CAIRO_STACK_BUFFER_SIZE];
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int num_rectangles;
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} cairo_rectangular_scan_converter_t;
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cairo_private void
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_cairo_rectangular_scan_converter_init (cairo_rectangular_scan_converter_t *self,
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const cairo_rectangle_int_t *extents);
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cairo_private cairo_status_t
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_cairo_rectangular_scan_converter_add_box (cairo_rectangular_scan_converter_t *self,
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const cairo_box_t *box,
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int dir);
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typedef struct _cairo_botor_scan_converter {
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cairo_scan_converter_t base;
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cairo_box_t extents;
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cairo_fill_rule_t fill_rule;
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int xmin, xmax;
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struct _cairo_botor_scan_converter_chunk {
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struct _cairo_botor_scan_converter_chunk *next;
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void *base;
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int count;
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int size;
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} chunks, *tail;
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char buf[CAIRO_STACK_BUFFER_SIZE];
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int num_edges;
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} cairo_botor_scan_converter_t;
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cairo_private void
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_cairo_botor_scan_converter_init (cairo_botor_scan_converter_t *self,
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const cairo_box_t *extents,
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cairo_fill_rule_t fill_rule);
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/* cairo-spans.c: */
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cairo_private cairo_scan_converter_t *
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_cairo_scan_converter_create_in_error (cairo_status_t error);
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cairo_private cairo_status_t
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_cairo_scan_converter_status (void *abstract_converter);
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cairo_private cairo_status_t
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_cairo_scan_converter_set_error (void *abstract_converter,
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cairo_status_t error);
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cairo_private cairo_span_renderer_t *
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_cairo_span_renderer_create_in_error (cairo_status_t error);
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cairo_private cairo_status_t
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_cairo_span_renderer_status (void *abstract_renderer);
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/* Set the renderer into an error state. This sets all the method
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* pointers except ->destroy() of the renderer to no-op
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* implementations that just return the error status. */
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cairo_private cairo_status_t
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_cairo_span_renderer_set_error (void *abstract_renderer,
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cairo_status_t error);
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cairo_private cairo_status_t
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_cairo_surface_composite_polygon (cairo_surface_t *surface,
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cairo_operator_t op,
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const cairo_pattern_t *pattern,
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cairo_fill_rule_t fill_rule,
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cairo_antialias_t antialias,
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const cairo_composite_rectangles_t *rects,
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cairo_polygon_t *polygon,
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cairo_region_t *clip_region);
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#endif /* CAIRO_SPANS_PRIVATE_H */
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