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