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Diffstat (limited to 'contrib/syslinux-4.02/com32/lib/sys/vesa/drawtxt.c')
-rw-r--r--contrib/syslinux-4.02/com32/lib/sys/vesa/drawtxt.c317
1 files changed, 317 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/lib/sys/vesa/drawtxt.c b/contrib/syslinux-4.02/com32/lib/sys/vesa/drawtxt.c
new file mode 100644
index 0000000..85a9e97
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/lib/sys/vesa/drawtxt.c
@@ -0,0 +1,317 @@
+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2006-2008 H. Peter Anvin - All Rights Reserved
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall
+ * be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+#include <inttypes.h>
+#include <colortbl.h>
+#include <string.h>
+#include "vesa.h"
+#include "video.h"
+#include "fill.h"
+
+/*
+ * Visible cursor information
+ */
+static uint8_t cursor_pattern[FONT_MAX_HEIGHT];
+static struct vesa_char *cursor_pointer = NULL;
+static int cursor_x, cursor_y;
+
+static inline void *copy_dword(void *dst, void *src, size_t dword_count)
+{
+ asm volatile ("rep; movsl":"+D" (dst), "+S"(src), "+c"(dword_count));
+ return dst; /* Updated destination pointer */
+}
+
+static inline __attribute__ ((always_inline))
+uint8_t alpha_val(uint8_t fg, uint8_t bg, uint8_t alpha)
+{
+ unsigned int tmp;
+
+ tmp = __vesacon_srgb_to_linear[fg] * alpha;
+ tmp += __vesacon_srgb_to_linear[bg] * (255 - alpha);
+
+ return __vesacon_linear_to_srgb[tmp >> 12];
+}
+
+static uint32_t alpha_pixel(uint32_t fg, uint32_t bg)
+{
+ uint8_t alpha = fg >> 24;
+ uint8_t fg_r = fg >> 16;
+ uint8_t fg_g = fg >> 8;
+ uint8_t fg_b = fg;
+ uint8_t bg_r = bg >> 16;
+ uint8_t bg_g = bg >> 8;
+ uint8_t bg_b = bg;
+
+ return
+ (alpha_val(fg_r, bg_r, alpha) << 16) |
+ (alpha_val(fg_g, bg_g, alpha) << 8) | (alpha_val(fg_b, bg_b, alpha));
+}
+
+static void vesacon_update_characters(int row, int col, int nrows, int ncols)
+{
+ const int height = __vesacon_font_height;
+ const int width = FONT_WIDTH;
+ uint32_t *bgrowptr, *bgptr, bgval, fgval;
+ uint32_t fgcolor = 0, bgcolor = 0, color;
+ uint8_t chbits = 0, chxbits = 0, chsbits = 0;
+ int i, j, jx, pixrow, pixsrow;
+ struct vesa_char *rowptr, *rowsptr, *cptr, *csptr;
+ unsigned int bytes_per_pixel = __vesacon_bytes_per_pixel;
+ unsigned long pixel_offset;
+ uint32_t row_buffer[__vesa_info.mi.h_res], *rowbufptr;
+ size_t fbrowptr;
+ uint8_t sha;
+
+ pixel_offset = ((row * height + VIDEO_BORDER) * __vesa_info.mi.h_res) +
+ (col * width + VIDEO_BORDER);
+
+ bgrowptr = &__vesacon_background[pixel_offset];
+ fbrowptr = (row * height + VIDEO_BORDER) * __vesa_info.mi.logical_scan +
+ (col * width + VIDEO_BORDER) * bytes_per_pixel;
+
+ /* Note that we keep a 1-character guard area around the real text area... */
+ rowptr = &__vesacon_text_display[(row+1)*(__vesacon_text_cols+2)+(col+1)];
+ rowsptr = rowptr - ((__vesacon_text_cols+2)+1);
+ pixrow = 0;
+ pixsrow = height - 1;
+
+ for (i = height * nrows; i >= 0; i--) {
+ bgptr = bgrowptr;
+ rowbufptr = row_buffer;
+
+ cptr = rowptr;
+ csptr = rowsptr;
+
+ chsbits = __vesacon_graphics_font[csptr->ch][pixsrow];
+ if (__unlikely(csptr == cursor_pointer))
+ chsbits |= cursor_pattern[pixsrow];
+ sha = console_color_table[csptr->attr].shadow;
+ chsbits &= (sha & 0x02) ? 0xff : 0x00;
+ chsbits ^= (sha & 0x01) ? 0xff : 0x00;
+ chsbits <<= (width - 2);
+ csptr++;
+
+ /* Draw two pixels beyond the end of the line. One for the shadow,
+ and one to make sure we have a whole dword of data for the copy
+ operation at the end. Note that this code depends on the fact that
+ all characters begin on dword boundaries in the frame buffer. */
+
+ for (jx = 1, j = width * ncols + 1; j >= 0; j--) {
+ chbits <<= 1;
+ chsbits <<= 1;
+ chxbits <<= 1;
+
+ switch (jx) {
+ case 1:
+ chbits = __vesacon_graphics_font[cptr->ch][pixrow];
+ if (__unlikely(cptr == cursor_pointer))
+ chbits |= cursor_pattern[pixrow];
+ sha = console_color_table[cptr->attr].shadow;
+ chxbits = chbits;
+ chxbits &= (sha & 0x02) ? 0xff : 0x00;
+ chxbits ^= (sha & 0x01) ? 0xff : 0x00;
+ fgcolor = console_color_table[cptr->attr].argb_fg;
+ bgcolor = console_color_table[cptr->attr].argb_bg;
+ cptr++;
+ jx--;
+ break;
+ case 0:
+ chsbits = __vesacon_graphics_font[csptr->ch][pixsrow];
+ if (__unlikely(csptr == cursor_pointer))
+ chsbits |= cursor_pattern[pixsrow];
+ sha = console_color_table[csptr->attr].shadow;
+ chsbits &= (sha & 0x02) ? 0xff : 0x00;
+ chsbits ^= (sha & 0x01) ? 0xff : 0x00;
+ csptr++;
+ jx = width - 1;
+ break;
+ default:
+ jx--;
+ break;
+ }
+
+ /* If this pixel is raised, use the offsetted value */
+ bgval = (chxbits & 0x80)
+ ? bgptr[__vesa_info.mi.h_res + 1] : *bgptr;
+ bgptr++;
+
+ /* If this pixel is set, use the fg color, else the bg color */
+ fgval = (chbits & 0x80) ? fgcolor : bgcolor;
+
+ /* Produce the combined color pixel value */
+ color = alpha_pixel(fgval, bgval);
+
+ /* Apply the shadow (75% shadow) */
+ if ((chsbits & ~chxbits) & 0x80) {
+ color >>= 2;
+ color &= 0x3f3f3f;
+ }
+
+ *rowbufptr++ = color;
+ }
+
+ /* Copy to frame buffer */
+ __vesacon_copy_to_screen(fbrowptr, row_buffer, rowbufptr - row_buffer);
+
+ bgrowptr += __vesa_info.mi.h_res;
+ fbrowptr += __vesa_info.mi.logical_scan;
+
+ if (++pixrow == height) {
+ rowptr += __vesacon_text_cols + 2;
+ pixrow = 0;
+ }
+ if (++pixsrow == height) {
+ rowsptr += __vesacon_text_cols + 2;
+ pixsrow = 0;
+ }
+ }
+}
+
+/* Bounding box for changed text. The (x1, y1) coordinates are +1! */
+static unsigned int upd_x0 = -1U, upd_x1, upd_y0 = -1U, upd_y1;
+
+/* Update the range already touched by various variables */
+void __vesacon_doit(void)
+{
+ if (upd_x1 > upd_x0 && upd_y1 > upd_y0) {
+ vesacon_update_characters(upd_y0, upd_x0, upd_y1 - upd_y0,
+ upd_x1 - upd_x0);
+ upd_x0 = upd_y0 = -1U;
+ upd_x1 = upd_y1 = 0;
+ }
+}
+
+/* Mark a range for update; note argument sequence is the same as
+ vesacon_update_characters() */
+static inline void vesacon_touch(int row, int col, int rows, int cols)
+{
+ unsigned int y0 = row;
+ unsigned int x0 = col;
+ unsigned int y1 = y0 + rows;
+ unsigned int x1 = x0 + cols;
+
+ if (y0 < upd_y0)
+ upd_y0 = y0;
+ if (y1 > upd_y1)
+ upd_y1 = y1;
+ if (x0 < upd_x0)
+ upd_x0 = x0;
+ if (x1 > upd_x1)
+ upd_x1 = x1;
+}
+
+/* Erase a region of the screen */
+void __vesacon_erase(int x0, int y0, int x1, int y1, attr_t attr)
+{
+ int y;
+ struct vesa_char *ptr = &__vesacon_text_display
+ [(y0 + 1) * (__vesacon_text_cols + 2) + (x0 + 1)];
+ struct vesa_char fill = {
+ .ch = ' ',
+ .attr = attr,
+ };
+ int ncols = x1 - x0 + 1;
+
+ for (y = y0; y <= y1; y++) {
+ vesacon_fill(ptr, fill, ncols);
+ ptr += __vesacon_text_cols + 2;
+ }
+
+ vesacon_touch(y0, x0, y1 - y0 + 1, ncols);
+}
+
+/* Scroll the screen up */
+void __vesacon_scroll_up(int nrows, attr_t attr)
+{
+ struct vesa_char *fromptr = &__vesacon_text_display
+ [(nrows + 1) * (__vesacon_text_cols + 2)];
+ struct vesa_char *toptr = &__vesacon_text_display
+ [(__vesacon_text_cols + 2)];
+ int dword_count =
+ (__vesacon_text_rows - nrows) * (__vesacon_text_cols + 2);
+ struct vesa_char fill = {
+ .ch = ' ',
+ .attr = attr,
+ };
+
+ toptr = copy_dword(toptr, fromptr, dword_count);
+
+ dword_count = nrows * (__vesacon_text_cols + 2);
+
+ vesacon_fill(toptr, fill, dword_count);
+
+ vesacon_touch(0, 0, __vesacon_text_rows, __vesacon_text_cols);
+}
+
+/* Draw one character text at a specific area of the screen */
+void __vesacon_write_char(int x, int y, uint8_t ch, attr_t attr)
+{
+ struct vesa_char *ptr = &__vesacon_text_display
+ [(y + 1) * (__vesacon_text_cols + 2) + (x + 1)];
+
+ ptr->ch = ch;
+ ptr->attr = attr;
+
+ vesacon_touch(y, x, 1, 1);
+}
+
+void __vesacon_set_cursor(int x, int y, bool visible)
+{
+ struct vesa_char *ptr = &__vesacon_text_display
+ [(y + 1) * (__vesacon_text_cols + 2) + (x + 1)];
+
+ if (cursor_pointer)
+ vesacon_touch(cursor_y, cursor_x, 1, 1);
+
+ if (!visible) {
+ /* Invisible cursor */
+ cursor_pointer = NULL;
+ } else {
+ cursor_pointer = ptr;
+ vesacon_touch(y, x, 1, 1);
+ }
+
+ cursor_x = x;
+ cursor_y = y;
+}
+
+void __vesacon_init_cursor(int font_height)
+{
+ int r0 = font_height - (font_height < 10 ? 2 : 3);
+
+ if (r0 < 0)
+ r0 = 0;
+
+ memset(cursor_pattern, 0, font_height);
+ cursor_pattern[r0] = 0xff;
+ cursor_pattern[r0 + 1] = 0xff;
+}
+
+void __vesacon_redraw_text(void)
+{
+ vesacon_update_characters(0, 0, __vesacon_text_rows, __vesacon_text_cols);
+}
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