qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
Log | Files | Refs | Submodules | LICENSE

framebuffer.c (3350B)

      1 /*
      2  * Framebuffer device helper routines
      3  *
      4  * Copyright (c) 2009 CodeSourcery
      5  * Written by Paul Brook <paul@codesourcery.com>
      6  *
      7  * This code is licensed under the GNU GPLv2.
      8  *
      9  * Contributions after 2012-01-13 are licensed under the terms of the
     10  * GNU GPL, version 2 or (at your option) any later version.
     11  */
     12 
     13 /* TODO:
     14    - Do something similar for framebuffers with local ram
     15    - Handle rotation here instead of hacking dest_pitch
     16    - Use common pixel conversion routines instead of per-device drawfn
     17    - Remove all DisplayState knowledge from devices.
     18  */
     19 
     20 #include "qemu/osdep.h"
     21 #include "ui/console.h"
     22 #include "framebuffer.h"
     23 
     24 void framebuffer_update_memory_section(
     25     MemoryRegionSection *mem_section,
     26     MemoryRegion *root,
     27     hwaddr base,
     28     unsigned rows,
     29     unsigned src_width)
     30 {
     31     hwaddr src_len = (hwaddr)rows * src_width;
     32 
     33     if (mem_section->mr) {
     34         memory_region_set_log(mem_section->mr, false, DIRTY_MEMORY_VGA);
     35         memory_region_unref(mem_section->mr);
     36         mem_section->mr = NULL;
     37     }
     38 
     39     *mem_section = memory_region_find(root, base, src_len);
     40     if (!mem_section->mr) {
     41         return;
     42     }
     43 
     44     if (int128_get64(mem_section->size) < src_len ||
     45             !memory_region_is_ram(mem_section->mr)) {
     46         memory_region_unref(mem_section->mr);
     47         mem_section->mr = NULL;
     48         return;
     49     }
     50 
     51     memory_region_set_log(mem_section->mr, true, DIRTY_MEMORY_VGA);
     52 }
     53 
     54 /* Render an image from a shared memory framebuffer.  */
     55 void framebuffer_update_display(
     56     DisplaySurface *ds,
     57     MemoryRegionSection *mem_section,
     58     int cols, /* Width in pixels.  */
     59     int rows, /* Height in pixels.  */
     60     int src_width, /* Length of source line, in bytes.  */
     61     int dest_row_pitch, /* Bytes between adjacent horizontal output pixels.  */
     62     int dest_col_pitch, /* Bytes between adjacent vertical output pixels.  */
     63     int invalidate, /* nonzero to redraw the whole image.  */
     64     drawfn fn,
     65     void *opaque,
     66     int *first_row, /* Input and output.  */
     67     int *last_row /* Output only */)
     68 {
     69     DirtyBitmapSnapshot *snap;
     70     uint8_t *dest;
     71     uint8_t *src;
     72     int first, last = 0;
     73     int dirty;
     74     int i;
     75     ram_addr_t addr;
     76     MemoryRegion *mem;
     77 
     78     i = *first_row;
     79     *first_row = -1;
     80 
     81     mem = mem_section->mr;
     82     if (!mem) {
     83         return;
     84     }
     85 
     86     addr = mem_section->offset_within_region;
     87     src = memory_region_get_ram_ptr(mem) + addr;
     88 
     89     dest = surface_data(ds);
     90     if (dest_col_pitch < 0) {
     91         dest -= dest_col_pitch * (cols - 1);
     92     }
     93     if (dest_row_pitch < 0) {
     94         dest -= dest_row_pitch * (rows - 1);
     95     }
     96     first = -1;
     97 
     98     addr += i * src_width;
     99     src += i * src_width;
    100     dest += i * dest_row_pitch;
    101 
    102     snap = memory_region_snapshot_and_clear_dirty(mem, addr, src_width * rows,
    103                                                   DIRTY_MEMORY_VGA);
    104     for (; i < rows; i++) {
    105         dirty = memory_region_snapshot_get_dirty(mem, snap, addr, src_width);
    106         if (dirty || invalidate) {
    107             fn(opaque, dest, src, cols, dest_col_pitch);
    108             if (first == -1)
    109                 first = i;
    110             last = i;
    111         }
    112         addr += src_width;
    113         src += src_width;
    114         dest += dest_row_pitch;
    115     }
    116     g_free(snap);
    117     if (first < 0) {
    118         return;
    119     }
    120     *first_row = first;
    121     *last_row = last;
    122 }