add cairo

1 files changed, 317 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/src/cairo-egl-context.c b/libs/cairo-1.16.0/src/cairo-egl-context.c
new file mode 100644
index 0000000..bf704c6
--- /dev/null
+++ b/libs/cairo-1.16.0/src/cairo-egl-context.c
@@ -0,0 +1,317 @@
+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2009 Eric Anholt
+ * Copyright © 2009 Chris Wilson
+ * Copyright © 2005 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it either under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation
+ * (the "LGPL") or, at your option, under the terms of the Mozilla
+ * Public License Version 1.1 (the "MPL"). If you do not alter this
+ * notice, a recipient may use your version of this file under either
+ * the MPL or the LGPL.
+ *
+ * You should have received a copy of the LGPL along with this library
+ * in the file COPYING-LGPL-2.1; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+ * You should have received a copy of the MPL along with this library
+ * in the file COPYING-MPL-1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
+ * OF ANY KIND, either express or implied. See the LGPL or the MPL for
+ * the specific language governing rights and limitations.
+ *
+ * The Original Code is the cairo graphics library.
+ *
+ * The Initial Developer of the Original Code is Red Hat, Inc.
+ *
+ * Contributor(s):
+ *	Carl Worth <cworth@cworth.org>
+ *	Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairoint.h"
+
+#include "cairo-gl-private.h"
+
+#include "cairo-error-private.h"
+
+typedef struct _cairo_egl_context {
+    cairo_gl_context_t base;
+
+    EGLDisplay display;
+    EGLContext context;
+
+    EGLSurface dummy_surface;
+
+    EGLContext previous_context;
+    EGLSurface previous_surface;
+} cairo_egl_context_t;
+
+typedef struct _cairo_egl_surface {
+    cairo_gl_surface_t base;
+
+    EGLSurface egl;
+} cairo_egl_surface_t;
+
+
+static cairo_bool_t
+_context_acquisition_changed_egl_state (cairo_egl_context_t *ctx,
+					EGLSurface current_surface)
+{
+    return ctx->previous_context != ctx->context ||
+	   ctx->previous_surface != current_surface;
+}
+
+static EGLSurface
+_egl_get_current_surface (cairo_egl_context_t *ctx)
+{
+    if (ctx->base.current_target == NULL ||
+        _cairo_gl_surface_is_texture (ctx->base.current_target)) {
+	return  ctx->dummy_surface;
+    }
+
+    return ((cairo_egl_surface_t *) ctx->base.current_target)->egl;
+}
+
+static void
+_egl_query_current_state (cairo_egl_context_t *ctx)
+{
+    ctx->previous_surface = eglGetCurrentSurface (EGL_DRAW);
+    ctx->previous_context = eglGetCurrentContext ();
+
+    /* If any of the values were none, assume they are all none. Not all
+       drivers seem well behaved when it comes to using these values across
+       multiple threads. */
+    if (ctx->previous_surface == EGL_NO_SURFACE ||
+	ctx->previous_context == EGL_NO_CONTEXT) {
+	ctx->previous_surface = EGL_NO_SURFACE;
+	ctx->previous_context = EGL_NO_CONTEXT;
+    }
+}
+
+static void
+_egl_acquire (void *abstract_ctx)
+{
+    cairo_egl_context_t *ctx = abstract_ctx;
+    EGLSurface current_surface = _egl_get_current_surface (ctx);
+
+    _egl_query_current_state (ctx);
+    if (!_context_acquisition_changed_egl_state (ctx, current_surface))
+	return;
+
+    eglMakeCurrent (ctx->display,
+		    current_surface, current_surface, ctx->context);
+}
+
+static void
+_egl_release (void *abstract_ctx)
+{
+    cairo_egl_context_t *ctx = abstract_ctx;
+    if (!ctx->base.thread_aware ||
+	!_context_acquisition_changed_egl_state (ctx,
+						 _egl_get_current_surface (ctx))) {
+	return;
+    }
+
+    eglMakeCurrent (ctx->display,
+		    EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+}
+
+static void
+_egl_make_current (void *abstract_ctx,
+	           cairo_gl_surface_t *abstract_surface)
+{
+    cairo_egl_context_t *ctx = abstract_ctx;
+    cairo_egl_surface_t *surface = (cairo_egl_surface_t *) abstract_surface;
+
+    eglMakeCurrent(ctx->display, surface->egl, surface->egl, ctx->context);
+}
+
+static void
+_egl_swap_buffers (void *abstract_ctx,
+		   cairo_gl_surface_t *abstract_surface)
+{
+    cairo_egl_context_t *ctx = abstract_ctx;
+    cairo_egl_surface_t *surface = (cairo_egl_surface_t *) abstract_surface;
+
+    eglSwapBuffers (ctx->display, surface->egl);
+}
+
+static void
+_egl_destroy (void *abstract_ctx)
+{
+    cairo_egl_context_t *ctx = abstract_ctx;
+
+    eglMakeCurrent (ctx->display,
+		    EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+    if (ctx->dummy_surface != EGL_NO_SURFACE)
+        eglDestroySurface (ctx->display, ctx->dummy_surface);
+}
+
+static cairo_bool_t
+_egl_make_current_surfaceless(cairo_egl_context_t *ctx)
+{
+    const char *extensions;
+
+    extensions = eglQueryString(ctx->display, EGL_EXTENSIONS);
+    if (strstr(extensions, "EGL_KHR_surfaceless_context") == NULL &&
+	strstr(extensions, "EGL_KHR_surfaceless_opengl") == NULL)
+	return FALSE;
+
+    if (!eglMakeCurrent(ctx->display,
+			EGL_NO_SURFACE, EGL_NO_SURFACE, ctx->context))
+	return FALSE;
+
+    return TRUE;
+}
+
+cairo_device_t *
+cairo_egl_device_create (EGLDisplay dpy, EGLContext egl)
+{
+    cairo_egl_context_t *ctx;
+    cairo_status_t status;
+    int attribs[] = {
+	EGL_WIDTH, 1,
+	EGL_HEIGHT, 1,
+	EGL_NONE,
+    };
+    EGLConfig config;
+    EGLint numConfigs;
+
+    ctx = calloc (1, sizeof (cairo_egl_context_t));
+    if (unlikely (ctx == NULL))
+	return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
+
+    ctx->display = dpy;
+    ctx->context = egl;
+
+    ctx->base.acquire = _egl_acquire;
+    ctx->base.release = _egl_release;
+    ctx->base.make_current = _egl_make_current;
+    ctx->base.swap_buffers = _egl_swap_buffers;
+    ctx->base.destroy = _egl_destroy;
+
+    /* We are about the change the current state of EGL, so we should
+     * query the pre-existing surface now instead of later. */
+    _egl_query_current_state (ctx);
+
+    if (!_egl_make_current_surfaceless (ctx)) {
+	/* Fall back to dummy surface, meh. */
+	EGLint config_attribs[] = {
+	    EGL_CONFIG_ID, 0,
+	    EGL_NONE
+	};
+
+	/*
+	 * In order to be able to make an egl context current when using a
+	 * pbuffer surface, that surface must have been created with a config
+	 * that is compatible with the context config. For Mesa, this means
+	 * that the configs must be the same.
+	 */
+	eglQueryContext (dpy, egl, EGL_CONFIG_ID, &config_attribs[1]);
+	eglChooseConfig (dpy, config_attribs, &config, 1, &numConfigs);
+
+	ctx->dummy_surface = eglCreatePbufferSurface (dpy, config, attribs);
+	if (ctx->dummy_surface == NULL) {
+	    free (ctx);
+	    return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
+	}
+
+	if (!eglMakeCurrent (dpy, ctx->dummy_surface, ctx->dummy_surface, egl)) {
+	    free (ctx);
+	    return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
+	}
+    }
+
+    status = _cairo_gl_dispatch_init (&ctx->base.dispatch, eglGetProcAddress);
+    if (unlikely (status)) {
+	free (ctx);
+	return _cairo_gl_context_create_in_error (status);
+    }
+
+    status = _cairo_gl_context_init (&ctx->base);
+    if (unlikely (status)) {
+	if (ctx->dummy_surface != EGL_NO_SURFACE)
+	    eglDestroySurface (dpy, ctx->dummy_surface);
+	free (ctx);
+	return _cairo_gl_context_create_in_error (status);
+    }
+
+    /* Tune the default VBO size to reduce overhead on embedded devices.
+     * This smaller size means that flushing needs to be done more often,
+     * but it is less demanding of scarce memory on embedded devices.
+     */
+    ctx->base.vbo_size = 16*1024;
+
+    eglMakeCurrent (dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+
+    return &ctx->base.base;
+}
+
+cairo_surface_t *
+cairo_gl_surface_create_for_egl (cairo_device_t	*device,
+				 EGLSurface	 egl,
+				 int		 width,
+				 int		 height)
+{
+    cairo_egl_surface_t *surface;
+
+    if (unlikely (device->status))
+	return _cairo_surface_create_in_error (device->status);
+
+    if (device->backend->type != CAIRO_DEVICE_TYPE_GL)
+	return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
+
+    if (width <= 0 || height <= 0)
+        return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
+
+    surface = calloc (1, sizeof (cairo_egl_surface_t));
+    if (unlikely (surface == NULL))
+	return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
+
+    _cairo_gl_surface_init (device, &surface->base,
+			    CAIRO_CONTENT_COLOR_ALPHA, width, height);
+    surface->egl = egl;
+
+    return &surface->base.base;
+}
+
+static cairo_bool_t is_egl_device (cairo_device_t *device)
+{
+    return (device->backend != NULL &&
+	    device->backend->type == CAIRO_DEVICE_TYPE_GL);
+}
+
+static cairo_egl_context_t *to_egl_context (cairo_device_t *device)
+{
+    return (cairo_egl_context_t *) device;
+}
+
+EGLDisplay
+cairo_egl_device_get_display (cairo_device_t *device)
+{
+    if (! is_egl_device (device)) {
+	_cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
+	return EGL_NO_DISPLAY;
+    }
+
+    return to_egl_context (device)->display;
+}
+
+cairo_public EGLContext
+cairo_egl_device_get_context (cairo_device_t *device)
+{
+    if (! is_egl_device (device)) {
+	_cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
+	return EGL_NO_CONTEXT;
+    }
+
+    return to_egl_context (device)->context;
+}