fbcompose - A compositing addon for fluxbox window manager.

 fbcompose(1) is an optional compositing addon for fluxbox window manager. It
 augments fluxbox with a number of graphical features. Most notably, fbcompose
 allows fluxbox to properly display applications that require compositing
 (docky, for example), adds support for true window transparency (as opposed to
 fluxbox's pseudo transparency) and provides a plugin framework to extend the
 compositor's functionality.

 As this is still a beta version of the compositor, the bugs are likely.

1 files changed, 163 insertions, 0 deletions

diff --git a/util/fbcompose/OpenGLTexPartitioner.cc b/util/fbcompose/OpenGLTexPartitioner.cc
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+++ b/util/fbcompose/OpenGLTexPartitioner.cc
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+/** OpenGLTexPartitioner.cc file for the fluxbox compositor. */
+
+// Copyright (c) 2011 Gediminas Liktaras (gliktaras at gmail dot com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#include "OpenGLTexPartitioner.hh"
+
+#include "OpenGLScreen.hh"
+
+using namespace FbCompositor;
+
+
+//--- CONSTRUCTORS AND DESTRUCTORS ---------------------------------------------
+
+// Constructor.
+OpenGL2DTexturePartition::OpenGL2DTexturePartition(const OpenGLScreen &screen, bool swizzle_alpha_to_one) :
+    m_screen(screen) {
+
+    m_display = (Display*)(screen.display());
+    m_max_texture_size = screen.maxTextureSize();
+    m_pixmap = None;
+    m_swizzle_alpha_to_one = swizzle_alpha_to_one;
+
+    m_full_height = 0;
+    m_full_width = 0;
+}
+
+// Destructor.
+OpenGL2DTexturePartition::~OpenGL2DTexturePartition() { }
+
+
+//--- MUTATORS -----------------------------------------------------------------
+
+// Sets the texture's contents to the given pixmap.
+void OpenGL2DTexturePartition::setPixmap(Pixmap pixmap, bool manage_pixmap, int width, int height, int depth) {
+    // Handle the pixmap and its GC.
+    if (m_pixmap) {
+        XFreePixmap(m_display, m_pixmap);
+        m_pixmap = None;
+    }
+    if (manage_pixmap) {
+        m_pixmap = pixmap;
+    }
+    GC gc = XCreateGC(m_display, pixmap, 0, NULL);
+
+    // Set partition's dimensions and partition that space.
+    m_full_height = height;
+    m_full_width = width;
+
+    int unit_height, unit_width;
+    std::vector<XRectangle> space_parts = partitionSpace(0, 0, width, height, m_max_texture_size, &unit_width, &unit_height);
+    int total_units = unit_height * unit_width;
+
+    // Adjust number of stored partitions.
+    while ((size_t)(total_units) > m_partitions.size()) {
+        TexturePart partition;
+        partition.borders = 0;
+        partition.texture = new OpenGL2DTexture(m_screen, m_swizzle_alpha_to_one);
+        m_partitions.push_back(partition);
+    }
+    while ((size_t)(total_units) < m_partitions.size()) {
+        m_partitions.pop_back();
+    }
+
+    // Create texture partitions.
+    if (total_units == 1) {
+        m_partitions[0].borders = BORDER_ALL;
+        m_partitions[0].texture->setPixmap(pixmap, false, m_full_width, m_full_height, false);
+    } else {
+        for (int i = 0; i < unit_height; i++) {
+            for (int j = 0; j < unit_width; j++) {
+                int idx = i * unit_width + j;
+
+                // Create partition's pixmap.
+                Pixmap part_pixmap = XCreatePixmap(m_display, m_screen.rootWindow().window(),
+                                                   space_parts[idx].width, space_parts[idx].height, depth);
+                XCopyArea(m_display, pixmap, part_pixmap, gc, space_parts[idx].x, space_parts[idx].y,
+                          space_parts[idx].width, space_parts[idx].height, 0, 0);
+
+                // Set up the partition.
+                m_partitions[idx].borders = getBorderBitfield(unit_width, unit_height, j, i);
+                m_partitions[idx].texture->setPixmap(part_pixmap, true, space_parts[idx].width, space_parts[idx].height, false);
+            }
+        }
+    }
+
+    // Cleanup.
+    XFreeGC(m_display, gc);
+}
+
+
+//--- SUPPORTING FUNCTIONS -------------------------------------------------
+
+// Returns the border bitfield of the given partition.
+unsigned int FbCompositor::getBorderBitfield(int unit_width, int unit_height, int x, int y) {
+    unsigned int borders = 0;
+    borders |= ((y == 0) ? BORDER_NORTH : 0);
+    borders |= ((x == 0) ? BORDER_WEST : 0);
+    borders |= ((y == (unit_height - 1)) ? BORDER_SOUTH : 0);
+    borders |= ((x == (unit_width - 1)) ? BORDER_EAST : 0);
+    return borders;
+}
+
+// Space partitioning function.
+std::vector<XRectangle> FbCompositor::partitionSpace(int x, int y, int width, int height, int max_partition_size,
+                                                     int *unit_width_return, int *unit_height_return) {
+    int unit_height = ((height - 1) / max_partition_size) + 1;
+    int unit_width = ((width - 1) / max_partition_size) + 1;
+
+    std::vector<XRectangle> partitions;
+    for (int i = 0; i < unit_height; i++) {
+        for (int j = 0; j < unit_width; j++) {
+            int part_x = x + j * max_partition_size;
+            int part_y = y + i * max_partition_size;
+            int part_height = ((i == (unit_height - 1)) ? (height % max_partition_size) : max_partition_size);
+            int part_width = ((j == (unit_width - 1)) ? (width % max_partition_size) : max_partition_size);
+
+            XRectangle part = { part_x, part_y, part_width, part_height };
+            partitions.push_back(part);
+        }
+    }
+
+    if (unit_width_return && unit_height_return) {
+        *unit_width_return = unit_width;
+        *unit_height_return = unit_height;
+    }
+
+    return partitions;
+}
+
+// Partitions space directly to buffers.
+std::vector<OpenGLBufferPtr> FbCompositor::partitionSpaceToBuffers(const OpenGLScreen &screen,
+        int x, int y, int width, int height) {
+
+    std::vector<XRectangle> space_part = partitionSpace(x, y, width, height, screen.maxTextureSize());
+    std::vector<OpenGLBufferPtr> buffers;
+
+    for (size_t i = 0; i < space_part.size(); i++) {
+        OpenGLBufferPtr buffer(new OpenGLBuffer(screen, GL_ARRAY_BUFFER));
+        buffer->bufferPosRectangle(screen.rootWindow().width(), screen.rootWindow().height(), space_part[i]);
+        buffers.push_back(buffer);
+    }
+
+    return buffers;
+}