summaryrefslogtreecommitdiff
path: root/hw/xfree86/modes/xf86gtf.c
diff options
context:
space:
mode:
Diffstat (limited to 'hw/xfree86/modes/xf86gtf.c')
-rw-r--r--hw/xfree86/modes/xf86gtf.c84
1 files changed, 41 insertions, 43 deletions
diff --git a/hw/xfree86/modes/xf86gtf.c b/hw/xfree86/modes/xf86gtf.c
index 9d5d50a2d..23707b481 100644
--- a/hw/xfree86/modes/xf86gtf.c
+++ b/hw/xfree86/modes/xf86gtf.c
@@ -61,7 +61,7 @@
/* Ruthlessly converted to server code by Adam Jackson <ajax@redhat.com> */
#ifdef HAVE_XORG_CONFIG_H
-# include <xorg-config.h>
+#include <xorg-config.h>
#else
#ifdef HAVE_CONFIG_H
#include <config.h>
@@ -88,7 +88,6 @@
#define C_PRIME (((C - J) * K/256.0) + J)
#define M_PRIME (K/256.0 * M)
-
/*
* xf86GTFMode() - as defined by the GTF Timing Standard, compute the
* Stage 1 Parameters using the vertical refresh frequency. In other
@@ -141,9 +140,9 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
*
* [H PIXELS RND] = ((ROUND([H PIXELS]/[CELL GRAN RND],0))*[CELLGRAN RND])
*/
-
+
h_pixels_rnd = rint((float) h_pixels / CELL_GRAN) * CELL_GRAN;
-
+
/* 2. If interlace is requested, the number of vertical lines assumed
* by the calculation must be halved, as the computation calculates
* the number of vertical lines per field. In either case, the
@@ -154,9 +153,8 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
*/
v_lines_rnd = interlaced ?
- rint((float) v_lines) / 2.0 :
- rint((float) v_lines);
-
+ rint((float) v_lines) / 2.0 : rint((float) v_lines);
+
/* 3. Find the frame rate required:
*
* [V FIELD RATE RQD] = IF([INT RQD?]="y", [I/P FREQ RQD]*2,
@@ -181,7 +179,8 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
* 0)
*/
- bottom_margin = margins ? rint(MARGIN_PERCENT/100.0 * v_lines_rnd) : (0.0);
+ bottom_margin =
+ margins ? rint(MARGIN_PERCENT / 100.0 * v_lines_rnd) : (0.0);
/* 6. If interlace is required, then set variable [INTERLACE]=0.5:
*
@@ -197,8 +196,8 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
* [MIN PORCH RND]+[INTERLACE]) * 1000000
*/
- h_period_est = (((1.0/v_field_rate_rqd) - (MIN_VSYNC_PLUS_BP/1000000.0))
- / (v_lines_rnd + (2*top_margin) + MIN_PORCH + interlace)
+ h_period_est = (((1.0 / v_field_rate_rqd) - (MIN_VSYNC_PLUS_BP / 1000000.0))
+ / (v_lines_rnd + (2 * top_margin) + MIN_PORCH + interlace)
* 1000000.0);
/* 8. Find the number of lines in V sync + back porch:
@@ -206,7 +205,7 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
* [V SYNC+BP] = ROUND(([MIN VSYNC+BP]/[H PERIOD EST]),0)
*/
- vsync_plus_bp = rint(MIN_VSYNC_PLUS_BP/h_period_est);
+ vsync_plus_bp = rint(MIN_VSYNC_PLUS_BP / h_period_est);
/* 9. Find the number of lines in V back porch alone:
*
@@ -214,9 +213,9 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
*
* XXX is "[V SYNC RND]" a typo? should be [V SYNC RQD]?
*/
-
+
v_back_porch = vsync_plus_bp - V_SYNC_RQD;
-
+
/* 10. Find the total number of lines in Vertical field period:
*
* [TOTAL V LINES] = [V LINES RND] + [TOP MARGIN (LINES)] +
@@ -226,21 +225,21 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
total_v_lines = v_lines_rnd + top_margin + bottom_margin + vsync_plus_bp +
interlace + MIN_PORCH;
-
+
/* 11. Estimate the Vertical field frequency:
*
* [V FIELD RATE EST] = 1 / [H PERIOD EST] / [TOTAL V LINES] * 1000000
*/
v_field_rate_est = 1.0 / h_period_est / total_v_lines * 1000000.0;
-
+
/* 12. Find the actual horizontal period:
*
* [H PERIOD] = [H PERIOD EST] / ([V FIELD RATE RQD] / [V FIELD RATE EST])
*/
h_period = h_period_est / (v_field_rate_rqd / v_field_rate_est);
-
+
/* 13. Find the actual Vertical field frequency:
*
* [V FIELD RATE] = 1 / [H PERIOD] / [TOTAL V LINES] * 1000000
@@ -266,7 +265,7 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
left_margin = margins ?
rint(h_pixels_rnd * MARGIN_PERCENT / 100.0 / CELL_GRAN) * CELL_GRAN :
0.0;
-
+
/* 16. Find number of pixels in right margin:
*
* [RIGHT MARGIN (PIXELS)] = (IF( [MARGINS RQD?]="Y",
@@ -274,11 +273,11 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
* [CELL GRAN RND]),0)) * [CELL GRAN RND],
* 0))
*/
-
+
right_margin = margins ?
rint(h_pixels_rnd * MARGIN_PERCENT / 100.0 / CELL_GRAN) * CELL_GRAN :
0.0;
-
+
/* 17. Find total number of active pixels in image and left and right
* margins:
*
@@ -287,7 +286,7 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
*/
total_active_pixels = h_pixels_rnd + left_margin + right_margin;
-
+
/* 18. Find the ideal blanking duty cycle from the blanking duty cycle
* equation:
*
@@ -295,7 +294,7 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
*/
ideal_duty_cycle = C_PRIME - (M_PRIME * h_period / 1000.0);
-
+
/* 19. Find the number of pixels in the blanking time to the nearest
* double character cell:
*
@@ -310,34 +309,32 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
ideal_duty_cycle /
(100.0 - ideal_duty_cycle) /
(2.0 * CELL_GRAN)) * (2.0 * CELL_GRAN);
-
+
/* 20. Find total number of pixels:
*
* [TOTAL PIXELS] = [TOTAL ACTIVE PIXELS] + [H BLANK (PIXELS)]
*/
total_pixels = total_active_pixels + h_blank;
-
+
/* 21. Find pixel clock frequency:
*
* [PIXEL FREQ] = [TOTAL PIXELS] / [H PERIOD]
*/
-
+
pixel_freq = total_pixels / h_period;
-
+
/* 22. Find horizontal frequency:
*
* [H FREQ] = 1000 / [H PERIOD]
*/
h_freq = 1000.0 / h_period;
-
/* Stage 1 computations are now complete; I should really pass
the results to another function and do the Stage 2
computations, but I only need a few more values so I'll just
append the computations here for now */
-
/* 17. Find the number of pixels in the horizontal sync period:
*
@@ -345,7 +342,8 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
* [CELL GRAN RND]),0))*[CELL GRAN RND]
*/
- h_sync = rint(H_SYNC_PERCENT/100.0 * total_pixels / CELL_GRAN) * CELL_GRAN;
+ h_sync =
+ rint(H_SYNC_PERCENT / 100.0 * total_pixels / CELL_GRAN) * CELL_GRAN;
/* 18. Find the number of pixels in the horizontal front porch period:
*
@@ -358,30 +356,30 @@ xf86GTFMode(int h_pixels, int v_lines, float freq, int interlaced, int margins)
*
* [V ODD FRONT PORCH(LINES)]=([MIN PORCH RND]+[INTERLACE])
*/
-
+
v_odd_front_porch_lines = MIN_PORCH + interlace;
-
+
/* finally, pack the results in the mode struct */
- mode->HDisplay = (int) (h_pixels_rnd);
- mode->HSyncStart = (int) (h_pixels_rnd + h_front_porch);
- mode->HSyncEnd = (int) (h_pixels_rnd + h_front_porch + h_sync);
- mode->HTotal = (int) (total_pixels);
- mode->VDisplay = (int) (v_lines_rnd);
- mode->VSyncStart = (int) (v_lines_rnd + v_odd_front_porch_lines);
- mode->VSyncEnd = (int) (v_lines_rnd + v_odd_front_porch_lines + V_SYNC_RQD);
- mode->VTotal = (int) (total_v_lines);
+ mode->HDisplay = (int) (h_pixels_rnd);
+ mode->HSyncStart = (int) (h_pixels_rnd + h_front_porch);
+ mode->HSyncEnd = (int) (h_pixels_rnd + h_front_porch + h_sync);
+ mode->HTotal = (int) (total_pixels);
+ mode->VDisplay = (int) (v_lines_rnd);
+ mode->VSyncStart = (int) (v_lines_rnd + v_odd_front_porch_lines);
+ mode->VSyncEnd = (int) (v_lines_rnd + v_odd_front_porch_lines + V_SYNC_RQD);
+ mode->VTotal = (int) (total_v_lines);
- mode->Clock = (int) (pixel_freq * 1000.0);
- mode->HSync = h_freq;
- mode->VRefresh = freq;
+ mode->Clock = (int) (pixel_freq * 1000.0);
+ mode->HSync = h_freq;
+ mode->VRefresh = freq;
xf86SetModeDefaultName(mode);
mode->Flags = V_NHSYNC | V_PVSYNC;
if (interlaced) {
- mode->VTotal *= 2;
- mode->Flags |= V_INTERLACE;
+ mode->VTotal *= 2;
+ mode->Flags |= V_INTERLACE;
}
return mode;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 13:33:51 +0000