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/*
* Simple frame buffer
*
* Copyright (c) 2017 Fabrice Bellard
*
* 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 <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <inttypes.h>
#include <assert.h>
#include "cutils.h"
#include "iomem.h"
#include "virtio.h"
#include "machine.h"
//#define DEBUG_VBE
#define FB_ALLOC_ALIGN 65536
struct SimpleFBState {
FBDevice *fb_dev;
int fb_page_count;
PhysMemoryRange *mem_range;
};
#define MAX_MERGE_DISTANCE 3
void simplefb_refresh(FBDevice *fb_dev,
SimpleFBDrawFunc *redraw_func, void *opaque,
PhysMemoryRange *mem_range,
int fb_page_count)
{
const uint32_t *dirty_bits;
uint32_t dirty_val;
int y0, y1, page_y0, page_y1, byte_pos, page_index, bit_pos;
dirty_bits = phys_mem_get_dirty_bits(mem_range);
page_index = 0;
y0 = y1 = 0;
while (page_index < fb_page_count) {
dirty_val = dirty_bits[page_index >> 5];
if (dirty_val != 0) {
bit_pos = 0;
while (dirty_val != 0) {
while (((dirty_val >> bit_pos) & 1) == 0)
bit_pos++;
dirty_val &= ~(1 << bit_pos);
byte_pos = (page_index + bit_pos) * DEVRAM_PAGE_SIZE;
page_y0 = byte_pos / fb_dev->stride;
page_y1 = ((byte_pos + DEVRAM_PAGE_SIZE - 1) / fb_dev->stride) + 1;
page_y1 = min_int(page_y1, fb_dev->height);
if (y0 == y1) {
y0 = page_y0;
y1 = page_y1;
} else if (page_y0 <= (y1 + MAX_MERGE_DISTANCE)) {
/* union with current region */
y1 = page_y1;
} else {
/* flush */
redraw_func(fb_dev, opaque,
0, y0, fb_dev->width, y1 - y0);
y0 = page_y0;
y1 = page_y1;
}
}
}
page_index += 32;
}
if (y0 != y1) {
redraw_func(fb_dev, opaque,
0, y0, fb_dev->width, y1 - y0);
}
}
static void simplefb_refresh1(FBDevice *fb_dev,
SimpleFBDrawFunc *redraw_func, void *opaque)
{
SimpleFBState *s = fb_dev->device_opaque;
simplefb_refresh(fb_dev, redraw_func, opaque, s->mem_range,
s->fb_page_count);
}
SimpleFBState *simplefb_init(PhysMemoryMap *map, uint64_t phys_addr,
FBDevice *fb_dev, int width, int height)
{
SimpleFBState *s;
s = mallocz(sizeof(*s));
s->fb_dev = fb_dev;
fb_dev->width = width;
fb_dev->height = height;
fb_dev->stride = width * 4;
fb_dev->fb_size = (height * fb_dev->stride + FB_ALLOC_ALIGN - 1) & ~(FB_ALLOC_ALIGN - 1);
s->fb_page_count = fb_dev->fb_size >> DEVRAM_PAGE_SIZE_LOG2;
s->mem_range = cpu_register_ram(map, phys_addr, fb_dev->fb_size,
DEVRAM_FLAG_DIRTY_BITS);
fb_dev->fb_data = s->mem_range->phys_mem;
fb_dev->device_opaque = s;
fb_dev->refresh = simplefb_refresh1;
return s;
}
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