LXR qemu/hw/display/framebuffer.c

   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
  24void 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.  */
  55void 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}
 123