Initial Contribution

1 files changed, 243 insertions, 0 deletions

diff --git a/framebuffer.c b/framebuffer.c
new file mode 100644
index 0000000..e7c955f
--- /dev/null
+++ b/framebuffer.c
@@ -0,0 +1,243 @@
+/* Copyright (C) 2007-2008 The Android Open Source Project
+**
+** This software is licensed under the terms of the GNU General Public
+** License version 2, as published by the Free Software Foundation, and
+** may be copied, distributed, and modified under those terms.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU General Public License for more details.
+*/
+#include "framebuffer.h"
+#include <memory.h>
+#include <stdlib.h>
+
+typedef struct {
+    /* client fields, these correspond to code that waits for updates before displaying them */
+    /* at the moment, only one client is supported */
+    void*                        fb_opaque;
+    QFrameBufferUpdateFunc       fb_update;
+    QFrameBufferRotateFunc       fb_rotate;
+    QFrameBufferDoneFunc         fb_done;
+
+    void*                        pr_opaque;
+    QFrameBufferCheckUpdateFunc  pr_check;
+    QFrameBufferInvalidateFunc   pr_invalidate;
+    QFrameBufferDetachFunc       pr_detach;
+
+} QFrameBufferExtra;
+
+
+static int
+_get_pitch( int  width, QFrameBufferFormat  format )
+{
+
+    switch (format) {
+        case QFRAME_BUFFER_RGB565:
+            return width*2;
+        default:
+            return -1;
+    }
+}
+
+
+int
+qframebuffer_init( QFrameBuffer*       qfbuff,
+                   int                 width,
+                   int                 height,
+                   int                 rotation,
+                   QFrameBufferFormat  format )
+{
+    int   pitch;
+
+    rotation &= 3;
+
+    if (!qfbuff || width < 0 || height < 0)
+        return -1;
+
+    pitch = _get_pitch( width, format );
+    if (pitch < 0)
+        return -1;
+
+    memset( qfbuff, 0, sizeof(*qfbuff) );
+
+    qfbuff->extra = calloc( 1, sizeof(QFrameBufferExtra) );
+    if (qfbuff->extra == NULL)
+        return -1;
+
+    qfbuff->pixels = calloc( pitch, height );
+    if (qfbuff->pixels == NULL && (height > 0 && pitch > 0)) {
+        free( qfbuff->extra );
+        return -1;
+    }
+
+    qfbuff->width  = width;
+    qfbuff->height = height;
+    qfbuff->pitch  = pitch;
+    qfbuff->format = format;
+
+    qframebuffer_set_dpi( qfbuff, DEFAULT_FRAMEBUFFER_DPI, DEFAULT_FRAMEBUFFER_DPI );
+    return 0;
+}
+
+
+void
+qframebuffer_set_dpi( QFrameBuffer*   qfbuff,
+                      int             x_dpi,
+                      int             y_dpi )
+{
+    /* dpi = dots / inch
+    ** inch = dots / dpi
+    ** mm / 25.4 = dots / dpi
+    ** mm = (dots * 25.4)/dpi
+    */
+    qfbuff->phys_width_mm  = 25.4 * qfbuff->width  / x_dpi;
+    qfbuff->phys_height_mm = 25.4 * qfbuff->height / y_dpi;
+}
+
+/* alternative to qframebuffer_set_dpi where one can set the physical dimensions directly */
+/* in millimeters. for the record 1 inch = 25.4 mm */
+void
+qframebuffer_set_mm( QFrameBuffer*   qfbuff,
+                     int             width_mm,
+                     int             height_mm )
+{
+    qfbuff->phys_width_mm  = width_mm;
+    qfbuff->phys_height_mm = height_mm;
+}
+
+void
+qframebuffer_update( QFrameBuffer*  qfbuff, int  x, int  y, int  w, int  h )
+{
+    QFrameBufferExtra*  extra = qfbuff->extra;
+
+    if (extra->fb_update)
+        extra->fb_update( extra->fb_opaque, x, y, w, h );
+}
+
+
+void
+qframebuffer_add_client( QFrameBuffer*           qfbuff,
+                         void*                   fb_opaque,
+                         QFrameBufferUpdateFunc  fb_update,
+                         QFrameBufferRotateFunc  fb_rotate,
+                         QFrameBufferDoneFunc    fb_done )
+{
+    QFrameBufferExtra*  extra = qfbuff->extra;
+
+    extra->fb_opaque = fb_opaque;
+    extra->fb_update = fb_update;
+    extra->fb_rotate = fb_rotate;
+    extra->fb_done   = fb_done;
+}
+
+void
+qframebuffer_add_producer( QFrameBuffer*                qfbuff,
+                           void*                        opaque,
+                           QFrameBufferCheckUpdateFunc  pr_check,
+                           QFrameBufferInvalidateFunc   pr_invalidate,
+                           QFrameBufferDetachFunc       pr_detach )
+{
+    QFrameBufferExtra*  extra = qfbuff->extra;
+
+    extra->pr_opaque     = opaque;
+    extra->pr_check      = pr_check;
+    extra->pr_invalidate = pr_invalidate;
+    extra->pr_detach     = pr_detach;
+}
+
+
+void
+qframebuffer_rotate( QFrameBuffer*  qfbuff, int  rotation )
+{
+    QFrameBufferExtra*  extra = qfbuff->extra;
+
+    if ((rotation ^ qfbuff->rotation) & 1) {
+        /* swap width and height if new rotation requires it */
+        int  temp = qfbuff->width;
+        qfbuff->width  = qfbuff->height;
+        qfbuff->height = temp;
+        qfbuff->pitch  = _get_pitch( qfbuff->width, qfbuff->format );
+
+        temp = qfbuff->phys_width_mm;
+        qfbuff->phys_width_mm  = qfbuff->phys_height_mm;
+        qfbuff->phys_height_mm = temp;
+    }
+    qfbuff->rotation = rotation;
+
+    if (extra->fb_rotate)
+        extra->fb_rotate( extra->fb_opaque, rotation );
+}
+
+
+extern void
+qframebuffer_done( QFrameBuffer*   qfbuff )
+{
+    QFrameBufferExtra*  extra = qfbuff->extra;
+
+    if (extra) {
+        if (extra->pr_detach)
+            extra->pr_detach( extra->pr_opaque );
+
+        if (extra->fb_done)
+            extra->fb_done( extra->fb_opaque );
+    }
+
+    free( qfbuff->pixels );
+    free( qfbuff->extra );
+    memset( qfbuff, 0, sizeof(*qfbuff) );
+}
+
+
+#define  MAX_FRAME_BUFFERS  8
+
+static QFrameBuffer* framebuffer_fifo[ MAX_FRAME_BUFFERS ];
+static int           framebuffer_fifo_rpos;
+static int           framebuffer_fifo_count;
+
+void
+qframebuffer_fifo_add( QFrameBuffer*  qfbuff )
+{
+    if (framebuffer_fifo_count >= MAX_FRAME_BUFFERS)
+        return;
+
+    framebuffer_fifo[ framebuffer_fifo_count++ ] = qfbuff;
+}
+
+
+QFrameBuffer*
+qframebuffer_fifo_get( void )
+{
+    if (framebuffer_fifo_rpos >= framebuffer_fifo_count)
+        return NULL;
+
+    return framebuffer_fifo[ framebuffer_fifo_rpos++ ];
+}
+
+
+void
+qframebuffer_check_updates( void )
+{
+    int  nn;
+    for (nn = 0; nn < framebuffer_fifo_count; nn++) {
+        QFrameBuffer*       q     = framebuffer_fifo[nn];
+        QFrameBufferExtra*  extra = q->extra;
+
+        if (extra->pr_check)
+            extra->pr_check( extra->pr_opaque );
+    }
+}
+
+void
+qframebuffer_invalidate_all( void )
+{
+    int  nn;
+    for (nn = 0; nn < framebuffer_fifo_count; nn++) {
+        QFrameBuffer*       q     = framebuffer_fifo[nn];
+        QFrameBufferExtra*  extra = q->extra;
+
+        if (extra->pr_invalidate)
+            extra->pr_invalidate( extra->pr_opaque );
+    }
+}