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/*
* Framebuffer device helper routines
*
* Copyright (c) 2009 CodeSourcery
* Written by Paul Brook <paul@codesourcery.com>
*
* This code is licensed under the GNU GPLv2.
*/
/* TODO:
- Do something similar for framebuffers with local ram
- Handle rotation here instead of hacking dest_pitch
- Use common pixel conversion routines instead of per-device drawfn
- Remove all DisplayState knowledge from devices.
*/
#include "hw.h"
#include "console.h"
#include "framebuffer.h"
/* Render an image from a shared memory framebuffer. */
void framebuffer_update_display(
DisplayState *ds,
target_phys_addr_t base,
int cols, /* Width in pixels. */
int rows, /* Leight in pixels. */
int src_width, /* Length of source line, in bytes. */
int dest_row_pitch, /* Bytes between adjacent horizontal output pixels. */
int dest_col_pitch, /* Bytes between adjacent vertical output pixels. */
int invalidate, /* nonzero to redraw the whole image. */
drawfn fn,
void *opaque,
int *first_row, /* Input and output. */
int *last_row /* Output only */)
{
target_phys_addr_t src_len;
uint8_t *dest;
uint8_t *src;
uint8_t *src_base;
int first, last = 0;
int dirty;
int i;
ram_addr_t addr;
ram_addr_t pd;
ram_addr_t pd2;
i = *first_row;
*first_row = -1;
src_len = src_width * rows;
cpu_physical_sync_dirty_bitmap(base, base + src_len);
pd = cpu_get_physical_page_desc(base);
pd2 = cpu_get_physical_page_desc(base + src_len - 1);
/* We should reall check that this is a continuous ram region.
Instead we just check that the first and last pages are
both ram, and the right distance apart. */
if ((pd & ~TARGET_PAGE_MASK) > IO_MEM_ROM
|| (pd2 & ~TARGET_PAGE_MASK) > IO_MEM_ROM) {
return;
}
pd = (pd & TARGET_PAGE_MASK) + (base & ~TARGET_PAGE_MASK);
if (((pd + src_len - 1) & TARGET_PAGE_MASK) != (pd2 & TARGET_PAGE_MASK)) {
return;
}
src_base = cpu_physical_memory_map(base, &src_len, 0);
/* If we can't map the framebuffer then bail. We could try harder,
but it's not really worth it as dirty flag tracking will probably
already have failed above. */
if (!src_base)
return;
if (src_len != src_width * rows) {
cpu_physical_memory_unmap(src_base, src_len, 0, 0);
return;
}
src = src_base;
dest = ds_get_data(ds);
if (dest_col_pitch < 0)
dest -= dest_col_pitch * (cols - 1);
first = -1;
addr = pd;
addr += i * src_width;
src += i * src_width;
dest += i * dest_row_pitch;
for (; i < rows; i++) {
target_phys_addr_t dirty_offset;
dirty = 0;
dirty_offset = 0;
while (addr + dirty_offset < TARGET_PAGE_ALIGN(addr + src_width)) {
dirty |= cpu_physical_memory_get_dirty(addr + dirty_offset,
VGA_DIRTY_FLAG);
dirty_offset += TARGET_PAGE_SIZE;
}
if (dirty || invalidate) {
fn(opaque, dest, src, cols, dest_col_pitch);
if (first == -1)
first = i;
last = i;
}
addr += src_width;
src += src_width;
dest += dest_row_pitch;
}
cpu_physical_memory_unmap(src_base, src_len, 0, 0);
if (first < 0) {
return;
}
cpu_physical_memory_reset_dirty(pd, pd + src_len, VGA_DIRTY_FLAG);
*first_row = first;
*last_row = last;
return;
}
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