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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
commited5640d8b587fbcfed7dd7967f3de04b37a76f26 (patch)
tree7a5f7c6c9d02226d7471cb3cc8fbbf631b415303 /libreofficekit/source/gtk/tilebuffer.hxx
parentInitial commit. (diff)
downloadlibreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.tar.xz
libreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.zip
Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'libreofficekit/source/gtk/tilebuffer.hxx')
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1 files changed, 281 insertions, 0 deletions
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_TILEBUFFER_HXX
+#define INCLUDED_TILEBUFFER_HXX
+
+#include <cairo.h>
+#include <gio/gio.h>
+#include <glib.h>
+
+#include <map>
+
+#define LOK_TILEBUFFER_ERROR (LOKTileBufferErrorQuark())
+
+// Lets use a square of side 256 pixels for each tile.
+const int nTileSizePixels = 256;
+
+/**
+ Converts the pixel value to zoom independent twip value.
+
+ @param fInput value to convert
+ @param zoom the current zoom level
+
+ @return the pixels value corresponding to given twip value
+*/
+float pixelToTwip(float fInput, float zoom);
+
+/**
+ Converts the zoom independent twip value pixel value.
+
+ @param fInput value to convert
+ @param zoom the current zoom level
+
+ @return the twip value corresponding to given pixel value
+*/
+float twipToPixel(float fInput, float zoom);
+
+/**
+ Gets GQuark identifying this tile buffer errors
+*/
+GQuark LOKTileBufferErrorQuark(void);
+
+/**
+ This class represents a single tile in the tile buffer.
+ It encloses a reference to GdkPixBuf containing the pixel data of the tile.
+*/
+class Tile
+{
+public:
+ Tile()
+ : valid(false)
+ , m_pBuffer(nullptr)
+ {
+ }
+ ~Tile()
+ {
+ if (m_pBuffer)
+ cairo_surface_destroy(m_pBuffer);
+ }
+
+ /**
+ Tells if this tile is valid or not. Initialised to 0 (invalid) during
+ object creation.
+ */
+ bool valid;
+
+ /// Function to get the pointer to enclosing cairo_surface_t
+ cairo_surface_t* getBuffer();
+ /// Used to set the pixel buffer of this object
+ void setSurface(cairo_surface_t*);
+
+private:
+ /// Pixel buffer data for this tile
+ cairo_surface_t* m_pBuffer;
+};
+
+/**
+ This class represents the tile buffer which is responsible for managing,
+ reusing and caching all the already rendered tiles. If the given tile is not
+ present in the buffer, call to LOK Document's (m_pLOKDocument) paintTile
+ method is made which fetches the rendered tile from LO core and store it in
+ buffer for future reuse.
+*/
+class TileBuffer
+{
+public:
+ TileBuffer(int columns = 0, int scale = 1)
+ : m_nWidth(columns)
+ {
+ cairo_surface_t* pSurface = cairo_image_surface_create(
+ CAIRO_FORMAT_ARGB32, nTileSizePixels * scale, nTileSizePixels * scale);
+ m_DummyTile.setSurface(pSurface);
+ cairo_surface_destroy(pSurface);
+ }
+
+ /**
+ Gets the underlying Tile object for given position. The position (0, 0)
+ points to the left top most tile of the buffer.
+
+ If the tile is not cached by the tile buffer, it makes a paintTile call
+ to LO core asking to render the given tile. It then stores the tile for
+ future reuse.
+
+ @param x the tile along the x-axis of the buffer
+ @param y the tile along the y-axis of the buffer
+ @param task GTask object containing the necessary data
+ @param pool GThreadPool managed by the widget instance used for all the
+ LOK calls made by widget. It is needed here because getTile invokes one
+ of the LOK call : paintTile.
+
+ @return the tile at the mentioned position (x, y)
+ */
+ Tile& getTile(int x, int y, GTask* task, GThreadPool* pool);
+
+ /*
+ Takes ownership of the surface and sets it on a tile at a given location
+ */
+ void setTile(int x, int y, cairo_surface_t* surface);
+
+ /// Returns true if a valid tile exists at this location
+ bool hasValidTile(int x, int y);
+
+ /// Destroys all the tiles in the tile buffer; also frees the memory allocated
+ /// for all the Tile objects.
+ void resetAllTiles();
+ /**
+ Marks the tile as invalid. The tile (0, 0) is the left topmost tile in
+ the tile buffer.
+
+ @param x the position of tile along x-axis
+ @param y the position of tile along y-axis
+ @param zoom zoom factor of the document
+ @param task GTask object containing the necessary data
+ @param pool GThreadPool managed by the widget instance used for all the
+ LOK calls made by widget. It is needed here because setInvalid() invokes one
+ of the LOK call : paintTile.
+ */
+ void setInvalid(int x, int y, float zoom, GTask* task, GThreadPool*);
+
+private:
+ /// Stores all the tiles cached by this tile buffer.
+ std::map<int, Tile> m_mTiles;
+ /// Width of the current tile buffer (number of columns)
+ int m_nWidth;
+ /// Dummy tile
+ Tile m_DummyTile;
+};
+
+enum
+{
+ LOK_LOAD_DOC,
+ LOK_POST_COMMAND,
+ LOK_SET_EDIT,
+ LOK_SET_PARTMODE,
+ LOK_SET_PART,
+ LOK_POST_KEY,
+ LOK_PAINT_TILE,
+ LOK_POST_MOUSE_EVENT,
+ LOK_SET_GRAPHIC_SELECTION,
+ LOK_SET_CLIENT_ZOOM
+};
+
+enum
+{
+ LOK_TILEBUFFER_CHANGED,
+ LOK_TILEBUFFER_MEMORY
+};
+
+/**
+ A struct that we use to store the data about the LOK call.
+
+ Object of this type is passed with all the LOK calls,
+ so that they can be identified. Additionally, it also contains
+ the data that LOK call needs.
+*/
+struct LOEvent
+{
+ /// To identify the type of LOK call
+ int m_nType;
+
+ /// @name post_command parameters
+ ///@{
+ const gchar* m_pCommand;
+ gchar* m_pArguments;
+ gboolean m_bNotifyWhenFinished;
+ ///@}
+
+ /// set_edit parameter
+ gboolean m_bEdit;
+
+ /// set_partmode parameter
+ int m_nPartMode;
+
+ /// set_part parameter
+ int m_nPart;
+
+ /// @name postKeyEvent parameters
+ ///@{
+ int m_nKeyEvent;
+ int m_nCharCode;
+ int m_nKeyCode;
+ ///@}
+
+ /// @name paintTile parameters
+ ///@{
+ int m_nPaintTileX;
+ int m_nPaintTileY;
+ float m_fPaintTileZoom;
+ TileBuffer* m_pTileBuffer;
+ ///@}
+
+ /// @name postMouseEvent parameters
+ ///@{
+ int m_nPostMouseEventType;
+ int m_nPostMouseEventX;
+ int m_nPostMouseEventY;
+ int m_nPostMouseEventCount;
+ int m_nPostMouseEventButton;
+ int m_nPostMouseEventModifier;
+ ///@}
+
+ /// @name setGraphicSelection parameters
+ ///@{
+ int m_nSetGraphicSelectionType;
+ int m_nSetGraphicSelectionX;
+ int m_nSetGraphicSelectionY;
+ ///@}
+
+ /// @name setClientView parameters
+ ///@{
+ int m_nTilePixelWidth;
+ int m_nTilePixelHeight;
+ int m_nTileTwipWidth;
+ int m_nTileTwipHeight;
+ ///@}
+
+ /// Constructor to instantiate an object of type `type`.
+ explicit LOEvent(int type)
+ : m_nType(type)
+ , m_pCommand(nullptr)
+ , m_pArguments(nullptr)
+ , m_bNotifyWhenFinished(false)
+ , m_bEdit(false)
+ , m_nPartMode(0)
+ , m_nPart(0)
+ , m_nKeyEvent(0)
+ , m_nCharCode(0)
+ , m_nKeyCode(0)
+ , m_nPaintTileX(0)
+ , m_nPaintTileY(0)
+ , m_fPaintTileZoom(0)
+ , m_pTileBuffer(nullptr)
+ , m_nPostMouseEventType(0)
+ , m_nPostMouseEventX(0)
+ , m_nPostMouseEventY(0)
+ , m_nPostMouseEventCount(0)
+ , m_nPostMouseEventButton(0)
+ , m_nPostMouseEventModifier(0)
+ , m_nSetGraphicSelectionType(0)
+ , m_nSetGraphicSelectionX(0)
+ , m_nSetGraphicSelectionY(0)
+ , m_nTilePixelWidth(0)
+ , m_nTilePixelHeight(0)
+ , m_nTileTwipWidth(0)
+ , m_nTileTwipHeight(0)
+ {
+ }
+
+ /// Wrapper around delete to help GLib.
+ static void destroy(void* pMemory);
+};
+
+#endif // INCLUDED_TILEBUFFER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */