зеркало из https://github.com/mozilla/gecko-dev.git
116 строки
5.0 KiB
C
116 строки
5.0 KiB
C
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef CAIROXLIBUTILS_H_
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#define CAIROXLIBUTILS_H_
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#include "cairo.h"
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#include <X11/Xlib.h>
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CAIRO_BEGIN_DECLS
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/**
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* This callback encapsulates Xlib-based rendering. We assume that the
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* execution of the callback is equivalent to compositing some RGBA image of
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* size (bounds_width, bounds_height) onto the drawable at offset (offset_x,
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* offset_y), clipped to the union of the clip_rects if num_rects is greater
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* than zero. This includes the assumption that the same RGBA image
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* is composited if you call the callback multiple times with the same closure,
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* display and visual during a single cairo_draw_with_xlib call.
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*
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* @return True on success, False on non-recoverable error
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*/
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typedef cairo_bool_t (*cairo_xlib_drawing_callback)(
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void* closure, Screen* screen, Drawable drawable, Visual* visual,
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short offset_x, short offset_y, XRectangle* clip_rects,
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unsigned int num_rects);
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/**
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* This structure captures the result of the native drawing, in case the
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* caller may wish to reapply the drawing efficiently later.
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*/
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typedef struct {
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cairo_surface_t* surface;
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cairo_bool_t uniform_alpha;
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cairo_bool_t uniform_color;
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double alpha; /* valid only if uniform_alpha is TRUE */
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double r, g, b; /* valid only if uniform_color is TRUE */
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} cairo_xlib_drawing_result_t;
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/**
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* This type specifies whether the native drawing callback draws all pixels
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* in its bounds opaquely, independent of the contents of the target drawable,
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* or whether it leaves pixels transparent/translucent or depends on the
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* existing contents of the target drawable in some way.
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*/
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typedef enum _cairo_xlib_drawing_opacity {
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CAIRO_XLIB_DRAWING_OPAQUE,
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CAIRO_XLIB_DRAWING_TRANSPARENT
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} cairo_xlib_drawing_opacity_t;
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/**
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* This type encodes the capabilities of the native drawing callback.
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*
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* If CAIRO_XLIB_DRAWING_SUPPORTS_OFFSET is set, 'offset_x' and 'offset_y'
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* can be nonzero in the call to the callback; otherwise they will be zero.
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*
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* If CAIRO_XLIB_DRAWING_SUPPORTS_CLIP_RECT is set, then 'num_rects' can be
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* zero or one in the call to the callback. If
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* CAIRO_XLIB_DRAWING_SUPPORTS_CLIP_LIST is set, then 'num_rects' can be
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* anything in the call to the callback. Otherwise 'num_rects' will be zero.
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* Do not set both of these values.
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*
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* If CAIRO_XLIB_DRAWING_SUPPORTS_ALTERNATE_SCREEN is set, then 'screen' can
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* be any screen on any display, otherwise it will be the default screen of
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* the display passed into cairo_draw_with_xlib.
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*
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* If CAIRO_XLIB_DRAWING_SUPPORTS_NONDEFAULT_VISUAL is set, then 'visual' can be
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* any visual, otherwise it will be equal to
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* DefaultVisualOfScreen (screen).
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*/
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typedef enum {
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CAIRO_XLIB_DRAWING_SUPPORTS_OFFSET = 0x01,
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CAIRO_XLIB_DRAWING_SUPPORTS_CLIP_RECT = 0x02,
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CAIRO_XLIB_DRAWING_SUPPORTS_CLIP_LIST = 0x04,
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CAIRO_XLIB_DRAWING_SUPPORTS_ALTERNATE_SCREEN = 0x08,
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CAIRO_XLIB_DRAWING_SUPPORTS_NONDEFAULT_VISUAL = 0x10
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} cairo_xlib_drawing_support_t;
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/**
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* Draw Xlib output into any cairo context. All cairo transforms and effects
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* are honored, including the current operator. This is equivalent to a
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* cairo_set_source_surface and then cairo_paint.
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* @param cr the context to draw into
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* @param callback the code to perform Xlib rendering
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* @param closure associated data
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* @param dpy an X display to use in case the cairo context has no associated X
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* display
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* @param width the width of the putative image drawn by the callback
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* @param height the height of the putative image drawn by the callback
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* @param is_opaque set to CAIRO_XLIB_DRAWING_IS_OPAQUE to indicate
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* that all alpha values of the putative image will be 1.0; the pixels drawn
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* into the Drawable must not depend on the prior contents of the Drawable in
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* any way
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* @param capabilities the capabilities of the callback as described above.
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* @param result if non-NULL, we *may* fill in the struct with information about
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* the rendered image. 'surface' may be filled in with a surface representing
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* the image, similar to the target of 'cr'. If 'uniform_alpha' is True then
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* every pixel of the image has the same alpha value 'alpha'. If
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* 'uniform_color' is True then every pixel of the image has the same RGB
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* color (r, g, b). If the image has uniform color and alpha (or alpha is zero,
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* in which case the color is always uniform) then we won't bother returning
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* a surface for it.
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*/
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void cairo_draw_with_xlib(cairo_t* cr, cairo_xlib_drawing_callback callback,
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void* closure, Display* dpy, unsigned int width,
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unsigned int height,
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cairo_xlib_drawing_opacity_t is_opaque,
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cairo_xlib_drawing_support_t capabilities,
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cairo_xlib_drawing_result_t* result);
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CAIRO_END_DECLS
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#endif /*CAIROXLIBUTILS_H_*/
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