diff options
Diffstat (limited to 'framebuffer.c')
| -rw-r--r-- | framebuffer.c | 243 |
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 ); + } +} |