src/uterm_drm2d_render.c

   1 /*
   2  * uterm - Linux User-Space Terminal drm2d module
   3  *
   4  * Copyright (c) 2011-2013 David Herrmann <dh.herrmann@googlemail.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining
   7  * a copy of this software and associated documentation files
   8  * (the "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sublicense, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  21  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /*
  27  * DRM2D Video backend rendering functions
  28  */
  29
  30 #include <errno.h>
  31 #include <fcntl.h>
  32 #include <inttypes.h>
  33 #include <stdbool.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <sys/mman.h>
  37 #include <unistd.h>
  38 #include <xf86drm.h>
  39 #include <xf86drmMode.h>
  40 #include "eloop.h"
  41 #include "shl_log.h"
  42 #include "uterm_drm_shared_internal.h"
  43 #include "uterm_drm2d_internal.h"
  44 #include "uterm_video.h"
  45 #include "uterm_video_internal.h"
  46
  47 #define LOG_SUBSYSTEM "uterm_drm2d_render"
  48
  49 int uterm_drm2d_display_blit(struct uterm_display *disp,
  50                              const struct uterm_video_buffer *buf,
  51                              unsigned int x, unsigned int y)
  52 {
  53         unsigned int tmp;
  54         uint8_t *dst, *src;
  55         unsigned int width, height;
  56         unsigned int sw, sh;
  57         struct uterm_drm2d_rb *rb;
  58         struct uterm_drm2d_display *d2d = uterm_drm_display_get_data(disp);
  59
  60         if (!buf || buf->format != UTERM_FORMAT_XRGB32)
  61                 return -EINVAL;
  62
  63         rb = &d2d->rb[d2d->current_rb ^ 1];
  64         sw = uterm_drm_mode_get_width(disp->current_mode);
  65         sh = uterm_drm_mode_get_height(disp->current_mode);
  66
  67         tmp = x + buf->width;
  68         if (tmp < x || x >= sw)
  69                 return -EINVAL;
  70         if (tmp > sw)
  71                 width = sw - x;
  72         else
  73                 width = buf->width;
  74
  75         tmp = y + buf->height;
  76         if (tmp < y || y >= sh)
  77                 return -EINVAL;
  78         if (tmp > sh)
  79                 height = sh - y;
  80         else
  81                 height = buf->height;
  82
  83         dst = rb->map;
  84         dst = &dst[y * rb->stride + x * 4];
  85         src = buf->data;
  86
  87         while (height--) {
  88                 memcpy(dst, src, 4 * width);
  89                 dst += rb->stride;
  90                 src += buf->stride;
  91         }
  92
  93         return 0;
  94 }
  95
  96 int uterm_drm2d_display_fake_blendv(struct uterm_display *disp,
  97                                     const struct uterm_video_blend_req *req,
  98                                     size_t num)
  99 {
 100         unsigned int tmp;
 101         uint8_t *dst, *src;
 102         unsigned int width, height, i, j;
 103         unsigned int sw, sh;
 104         uint_fast32_t r, g, b, out;
 105         struct uterm_drm2d_rb *rb;
 106         struct uterm_drm2d_display *d2d = uterm_drm_display_get_data(disp);
 107
 108         if (!req)
 109                 return -EINVAL;
 110
 111         rb = &d2d->rb[d2d->current_rb ^ 1];
 112         sw = uterm_drm_mode_get_width(disp->current_mode);
 113         sh = uterm_drm_mode_get_height(disp->current_mode);
 114
 115         for (j = 0; j < num; ++j, ++req) {
 116                 if (!req->buf)
 117                         continue;
 118
 119                 if (req->buf->format != UTERM_FORMAT_GREY)
 120                         return -EOPNOTSUPP;
 121
 122                 tmp = req->x + req->buf->width;
 123                 if (tmp < req->x || req->x >= sw)
 124                         return -EINVAL;
 125                 if (tmp > sw)
 126                         width = sw - req->x;
 127                 else
 128                         width = req->buf->width;
 129
 130                 tmp = req->y + req->buf->height;
 131                 if (tmp < req->y || req->y >= sh)
 132                         return -EINVAL;
 133                 if (tmp > sh)
 134                         height = sh - req->y;
 135                 else
 136                         height = req->buf->height;
 137
 138                 dst = rb->map;
 139                 dst = &dst[req->y * rb->stride + req->x * 4];
 140                 src = req->buf->data;
 141
 142                 while (height--) {
 143                         for (i = 0; i < width; ++i) {
 144                                 /* Division by 255 (t /= 255) is done with:
 145                                  *   t += 0x80
 146                                  *   t = (t + (t >> 8)) >> 8
 147                                  * This speeds up the computation by ~20% as the
 148                                  * division is not needed. */
 149                                 if (src[i] == 0) {
 150                                         r = req->br;
 151                                         g = req->bg;
 152                                         b = req->bb;
 153                                         out = (r << 16) | (g << 8) | b;
 154                                 } else if (src[i] == 255) {
 155                                         r = req->fr;
 156                                         g = req->fg;
 157                                         b = req->fb;
 158                                         out = (r << 16) | (g << 8) | b;
 159                                 } else {
 160                                         r = req->fr * src[i] +
 161                                             req->br * (255 - src[i]);
 162                                         r += 0x80;
 163                                         r = (r + (r >> 8)) >> 8;
 164
 165                                         g = req->fg * src[i] +
 166                                             req->bg * (255 - src[i]);
 167                                         g += 0x80;
 168                                         g = (g + (g >> 8)) >> 8;
 169
 170                                         b = req->fb * src[i] +
 171                                             req->bb * (255 - src[i]);
 172                                         b += 0x80;
 173                                         b = (b + (b >> 8)) >> 8;
 174                                         out = (r << 16) | (g << 8) | b;
 175                                 }
 176
 177                                 ((uint32_t*)dst)[i] = out;
 178                         }
 179                         dst += rb->stride;
 180                         src += req->buf->stride;
 181                 }
 182         }
 183
 184         return 0;
 185 }
 186
 187 int uterm_drm2d_display_fill(struct uterm_display *disp,
 188                              uint8_t r, uint8_t g, uint8_t b,
 189                              unsigned int x, unsigned int y,
 190                              unsigned int width, unsigned int height)
 191 {
 192         unsigned int tmp, i;
 193         uint8_t *dst;
 194         unsigned int sw, sh;
 195         struct uterm_drm2d_rb *rb;
 196         struct uterm_drm2d_display *d2d = uterm_drm_display_get_data(disp);
 197
 198         rb = &d2d->rb[d2d->current_rb ^ 1];
 199         sw = uterm_drm_mode_get_width(disp->current_mode);
 200         sh = uterm_drm_mode_get_height(disp->current_mode);
 201
 202         tmp = x + width;
 203         if (tmp < x || x >= sw)
 204                 return -EINVAL;
 205         if (tmp > sw)
 206                 width = sw - x;
 207         tmp = y + height;
 208         if (tmp < y || y >= sh)
 209                 return -EINVAL;
 210         if (tmp > sh)
 211                 height = sh - y;
 212
 213         dst = rb->map;
 214         dst = &dst[y * rb->stride + x * 4];
 215
 216         while (height--) {
 217                 for (i = 0; i < width; ++i)
 218                         ((uint32_t*)dst)[i] = (r << 16) | (g << 8) | b;
 219                 dst += rb->stride;
 220         }
 221
 222         return 0;
 223 }