guacamole-spice-protocol/libguac/include/protocol.h
2011-10-23 15:53:22 -07:00

545 lines
17 KiB
C

/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* 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/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef _GUAC_PROTOCOL_H
#define _GUAC_PROTOCOL_H
#include <cairo/cairo.h>
#include "guacio.h"
/**
* Provides functions and structures required for communicating using the
* Guacamole protocol over a GUACIO connection, such as that provided by
* guac_client objects.
*
* @file protocol.h
*/
/**
* The number of milliseconds to wait for messages in any phase before
* timing out and closing the connection with an error.
*/
#define GUAC_TIMEOUT 15000
/**
* The number of microseconds to wait for messages in any phase before
* timing out and closing the conncetion with an error. This is always
* equal to GUAC_TIMEOUT * 1000.
*/
#define GUAC_USEC_TIMEOUT (GUAC_TIMEOUT*1000)
typedef int64_t guac_timestamp_t;
/**
* Composite modes used by Guacamole draw instructions. Each
* composite mode maps to a unique channel mask integer.
*/
typedef enum guac_composite_mode_t {
/*
* A: Source where destination transparent = S n D'
* B: Source where destination opaque = S n D
* C: Destination where source transparent = D n S'
* D: Destination where source opaque = D n S
*
* 0 = Active, 1 = Inactive
*/
/* ABCD */
GUAC_COMP_ROUT = 0x2, /* 0010 - Clears destination where source opaque */
GUAC_COMP_ATOP = 0x6, /* 0110 - Fill where destination opaque only */
GUAC_COMP_XOR = 0xA, /* 1010 - XOR */
GUAC_COMP_ROVER = 0xB, /* 1011 - Fill where destination transparent only */
GUAC_COMP_OVER = 0xE, /* 1110 - Draw normally */
GUAC_COMP_PLUS = 0xF, /* 1111 - Add */
/* Unimplemented in client: */
/* NOT IMPLEMENTED: 0000 - Clear */
/* NOT IMPLEMENTED: 0011 - No operation */
/* NOT IMPLEMENTED: 0101 - Additive IN */
/* NOT IMPLEMENTED: 0111 - Additive ATOP */
/* NOT IMPLEMENTED: 1101 - Additive RATOP */
/* Buggy in webkit browsers, as they keep channel C on in all cases: */
GUAC_COMP_RIN = 0x1, /* 0001 */
GUAC_COMP_IN = 0x4, /* 0100 */
GUAC_COMP_OUT = 0x8, /* 1000 */
GUAC_COMP_RATOP = 0x9, /* 1001 */
GUAC_COMP_SRC = 0xC /* 1100 */
} guac_composite_mode_t;
typedef struct guac_layer_update guac_layer_update;
typedef struct guac_layer guac_layer;
/**
* The type of a layer update (png, copy, or rect, for
* example).
*/
typedef enum guac_layer_update_type_t {
GUAC_LAYER_UPDATE_PNG,
GUAC_LAYER_UPDATE_COPY,
GUAC_LAYER_UPDATE_CLIP,
GUAC_LAYER_UPDATE_RECT
} guac_layer_update_type_t;
/**
* Represents an abstract graphical update or state change
* of a layer, including dirty rectangle information.
*/
struct guac_layer_update {
/**
* The type of this update. Update type corresponds
* directly to the instruction that would be sent
* if the queue is flushed.
*/
guac_layer_update_type_t type;
/**
* The composite mode to use in this update.
*/
guac_composite_mode_t mode;
/**
* The layer to retrieve image data from.
*/
const guac_layer* src_layer;
/**
* The surface to retrieve image data from.
*/
cairo_surface_t* src_image;
/**
* The red component of the source color.
*/
int src_red;
/**
* The green component of the source color.
*/
int src_green;
/**
* The blue component of the source color.
*/
int src_blue;
/**
* The alpha component of the source color.
*/
int src_alpha;
/**
* The X coordinage of the upper-left corner of the
* source rectangle.
*/
int src_x;
/**
* The Y coordinage of the upper-left corner of the
* source rectangle.
*/
int src_y;
/**
* The layer this update should affect.
*/
guac_layer* dst_layer;
/**
* The X coordinate of the upper-left corner of the
* destination rectangle.
*/
int dst_x;
/**
* The Y coordinate of the upper-left corner of the
* destination rectangle.
*/
int dst_y;
/**
* The width of the destination or source rectangle.
* The dimensions of the destination and source
* rectangles are always identical.
*/
int width;
/**
* The height of the destination or source rectangle.
* The dimensions of the destination and source
* rectangles are always identical.
*/
int height;
/**
* The next update in the update queue, if any.
*/
guac_layer_update* next;
};
/**
* Represents a single layer within the Guacamole protocol.
*/
struct guac_layer {
/**
* The index of this layer.
*/
int index;
/**
* The next allocated layer in the list of all layers.
*/
guac_layer* next;
/**
* The next available (unused) layer in the list of
* allocated but free'd layers.
*/
guac_layer* next_available;
/**
* The first element in this layer's update queue.
*/
guac_layer_update* update_queue_head;
};
/**
* Represents a single instruction within the Guacamole protocol.
*/
typedef struct guac_instruction {
/**
* The opcode of the instruction.
*/
char* opcode;
/**
* The number of arguments passed to this instruction.
*/
int argc;
/**
* Array of all arguments passed to this instruction.
*/
char** argv;
} guac_instruction;
/**
* Frees all memory allocated to the given instruction opcode
* and arguments. The instruction structure itself will not
* be freed.
*
* @param instruction The instruction to free.
*/
void guac_free_instruction_data(guac_instruction* instruction);
/**
* Frees all memory allocated to the given instruction. This
* includes freeing memory allocated for the structure
* itself.
*
* @param instruction The instruction to free.
*/
void guac_free_instruction(guac_instruction* instruction);
/**
* Sends an args instruction over the given GUACIO connection.
*
* @param io The GUACIO connection to use.
* @param args The NULL-terminated array of argument names (strings).
* @return Zero on success, non-zero on error.
*/
int guac_send_args(GUACIO* io, const char** name);
/**
* Sends a name instruction over the given GUACIO connection.
*
* @param io The GUACIO connection to use.
* @param name The name to send within the name instruction.
* @return Zero on success, non-zero on error.
*/
int guac_send_name(GUACIO* io, const char* name);
/**
* Sends a sync instruction over the given GUACIO connection. The
* current time in milliseconds should be passed in as the timestamp.
*
* @param io The GUACIO connection to use.
* @param timestamp The current timestamp (in milliseconds).
* @return Zero on success, non-zero on error.
*/
int guac_send_sync(GUACIO* io, guac_timestamp_t timestamp);
/**
* Sends an error instruction over the given GUACIO connection.
*
* @param io The GUACIO connection to use.
* @param error The description associated with the error.
* @return Zero on success, non-zero on error.
*/
int guac_send_error(GUACIO* io, const char* error);
/**
* Sends a clipboard instruction over the given GUACIO connection.
*
* @param io The GUACIO connection to use.
* @param data The clipboard data to send.
* @return Zero on success, non-zero on error.
*/
int guac_send_clipboard(GUACIO* io, const char* data);
/**
* Sends a size instruction over the given GUACIO connection.
*
* @param io The GUACIO connection to use.
* @param w The width of the display.
* @param h The height of the display.
* @return Zero on success, non-zero on error.
*/
int guac_send_size(GUACIO* io, int w, int h);
/**
* Sends a copy instruction over the given GUACIO connection.
*
* @param io The GUACIO connection to use.
* @param srcl The source layer.
* @param srcx The X coordinate of the source rectangle.
* @param srcy The Y coordinate of the source rectangle.
* @param w The width of the source rectangle.
* @param h The height of the source rectangle.
* @param mode The composite mode to use.
* @param dstl The destination layer.
* @param dstx The X coordinate of the destination, where the source rectangle
* should be copied.
* @param dsty The Y coordinate of the destination, where the source rectangle
* should be copied.
* @return Zero on success, non-zero on error.
*/
int guac_send_copy(GUACIO* io,
const guac_layer* srcl, int srcx, int srcy, int w, int h,
guac_composite_mode_t mode, const guac_layer* dstl, int dstx, int dsty);
/**
* Sends a rect instruction over the given GUACIO connection.
*
* @param io The GUACIO connection to use.
* @param mode The composite mode to use.
* @param layer The destination layer.
* @param x The X coordinate of the rectangle.
* @param y The Y coordinate of the rectangle.
* @param width The width of the rectangle.
* @param height The height of the rectangle.
* @param r The red component of the color of the rectangle.
* @param g The green component of the color of the rectangle.
* @param b The blue component of the color of the rectangle.
* @param a The alpha (transparency) component of the color of the rectangle.
* @return Zero on success, non-zero on error.
*/
int guac_send_rect(GUACIO* io,
guac_composite_mode_t mode, const guac_layer* layer,
int x, int y, int width, int height,
int r, int g, int b, int a);
/**
* Sends a clip instruction over the given GUACIO connection.
*
* @param io The GUACIO connection to use.
* @param layer The layer to set the clipping region of.
* @param x The X coordinate of the clipping rectangle.
* @param y The Y coordinate of the clipping rectangle.
* @param width The width of the clipping rectangle.
* @param height The height of the clipping rectangle.
* @return Zero on success, non-zero on error.
*/
int guac_send_clip(GUACIO* io, const guac_layer* layer,
int x, int y, int width, int height);
/**
* Sends a png instruction over the given GUACIO connection. The PNG image data
* given will be automatically base64-encoded for transmission.
*
* @param io The GUACIO connection to use.
* @param mode The composite mode to use.
* @param layer The destination layer.
* @param x The destination X coordinate.
* @param y The destination Y coordinate.
* @param surface A cairo surface containing the image data to send.
* @return Zero on success, non-zero on error.
*/
int guac_send_png(GUACIO* io, guac_composite_mode_t mode,
const guac_layer* layer, int x, int y, cairo_surface_t* surface);
/**
* Sends a cursor instruction over the given GUACIO connection. The PNG image
* data given will be automatically base64-encoded for transmission.
*
* @param io The GUACIO connection to use.
* @param x The X coordinate of the cursor hotspot.
* @param y The Y coordinate of the cursor hotspot.
* @param surface A cairo surface containing the image data to send.
* @return Zero on success, non-zero on error.
*/
int guac_send_cursor(GUACIO* io, int x, int y, cairo_surface_t* surface);
/**
* Queues a png instruction in the given layer. The layer may combine
* and re-order multiple instructions into more efficient instructions
* providing the end result is the same image.
*
* @param layer The destination layer.
* @param mode The composite mode to use.
* @param x The destination X coordinate.
* @param y The destination Y coordinate.
* @param surface A cairo surface containing the image data to send.
*/
void guac_layer_png(guac_layer* layer, guac_composite_mode_t mode,
int x, int y, cairo_surface_t* surface);
/**
* Queues a copy instruction in a given layer. The layer may combine
* and re-order multiple instructions into more efficient instructions
* providing the end result is the same image.
*
* @param layer The destination layer.
* @param mode The composite mode to use.
* @param srcl The source layer.
* @param srcx The X coordinate of the source rectangle.
* @param srcy The Y coordinate of the source rectangle.
* @param w The width of the source rectangle.
* @param h The height of the source rectangle.
* @param dstx The X coordinate of the destination, where the source rectangle
* should be copied.
* @param dsty The Y coordinate of the destination, where the source rectangle
* should be copied.
*/
void guac_layer_copy(guac_layer* layer, guac_composite_mode_t mode,
const guac_layer* srcl, int srcx, int srcy, int w, int h,
int dstx, int dsty);
/**
* Queues a clip instruction in a given layer. The layer may combine
* and re-order multiple instructions into more efficient instructions
* providing the end result is the same image.
*
* @param layer The layer to set the clipping region of.
* @param x The X coordinate of the clipping rectangle.
* @param y The Y coordinate of the clipping rectangle.
* @param width The width of the clipping rectangle.
* @param height The height of the clipping rectangle.
*/
void guac_layer_clip(guac_layer* layer,
int x, int y, int width, int height);
/**
* Queues a rect instruction in a given layer. The layer may combine
* and re-order multiple instructions into more efficient instructions
* providing the end result is the same image.
*
* @param layer The destination layer.
* @param mode The composite mode to use.
* @param x The X coordinate of the rectangle.
* @param y The Y coordinate of the rectangle.
* @param width The width of the rectangle.
* @param height The height of the rectangle.
* @param r The red component of the color of the rectangle.
* @param g The green component of the color of the rectangle.
* @param b The blue component of the color of the rectangle.
* @param a The alpha (transparency) component of the color of the rectangle.
*/
void guac_layer_rect(guac_layer* layer, guac_composite_mode_t mode,
int x, int y, int width, int height,
int r, int g, int b, int a);
/**
* Flushes any queued instructions in the given layer, sending those
* instructions over the given GUACIO connection. These instructions
* may not be identical to the instructions originally queued; they
* may be re-ordered or combined providing the end result of executing
* all instructions sent by guac_flush() is identical to executing all
* previously queued instructions as specified and in order.
*
* @param layer The layer to flush.
* @param io The GUACIO connection to use.
* @return Zero on success, non-zero on error.
*/
int guac_layer_flush(guac_layer* layer, GUACIO* io);
/**
* Returns whether new instruction data is available on the given GUACIO
* connection for parsing.
*
* @param io The GUACIO connection to use.
* @return A positive value if data is available, negative on error, or
* zero if no data is currently available.
*/
int guac_instructions_waiting(GUACIO* io);
/**
* Reads a single instruction from the given GUACIO connection.
*
* @param io The GUACIO connection to use.
* @param parsed_instruction A pointer to a guac_instruction structure which
* will be populated with data read from the given
* GUACIO connection.
* @return A positive value if data was successfully read, negative on
* error, or zero if the instruction could not be read completely
* because GUAC_TIMEOUT elapsed, in which case subsequent calls to
* guac_read_instruction() will return the parsed instruction once
* enough data is available.
*/
int guac_read_instruction(GUACIO* io, guac_instruction* parsed_instruction);
guac_timestamp_t guac_current_timestamp();
void guac_sleep(int millis);
#endif