diff options
Diffstat (limited to 'libvo/gtf.c')
| -rw-r--r-- | libvo/gtf.c | 120 |
1 files changed, 60 insertions, 60 deletions
diff --git a/libvo/gtf.c b/libvo/gtf.c index 4e8429fe9e..ce82d39a70 100644 --- a/libvo/gtf.c +++ b/libvo/gtf.c @@ -23,9 +23,9 @@ //Version 0.4 #include "config.h" -#include <stdio.h> -#include <stdlib.h> -#include <math.h> +#include <stdio.h> +#include <stdlib.h> +#include <math.h> #include "gtf.h" #undef GTF_DEBUG @@ -52,7 +52,7 @@ static void GetRoundedConstants(GTF_constants *c) c->m = (GTF_given_constants.k / 256) * GTF_given_constants.m; } -void GTF_calcTimings(double X,double Y,double freq, int type, +void GTF_calcTimings(double X,double Y,double freq, int type, int want_margins, int want_interlace,struct VesaCRTCInfoBlock *result ) { GTF_constants c; @@ -62,37 +62,37 @@ void GTF_calcTimings(double X,double Y,double freq, int type, double total_active_pixels, ideal_duty_cycle, blanking_time, H_total_pixels; double H_freq, pixel_freq,actual_V_frame_freq; double H_sync_start, H_sync_end, H_back_porch, H_front_porch, H_sync_width; - double V_back_porch, V_front_porch, V_sync_start, V_sync_end,V_sync_width; + double V_back_porch, V_front_porch, V_sync_start, V_sync_end,V_sync_width; double ideal_H_period; GetRoundedConstants(&c); - + pixel_freq = RR = freq; /* DETERMINE IF 1/2 LINE INTERLACE IS PRESENT */ - - interlace = 0; - + + interlace = 0; + if (want_interlace) { - RR = RR * 2; + RR = RR * 2; Y=Y/2; interlace = 0.5; } - + result->Flags = 0; - + if ((Y==300)||(Y==200)||(Y==240)) { Y*=2; result->Flags = VESA_CRTC_DOUBLESCAN; /* TODO: check if mode support */ - } - + } + /* DETERMINE NUMBER OF LINES IN V MARGIN */ /* DETERMINE NUMBER OF PIXELS IN H MARGIN [pixels] */ - + margin_left = margin_right = 0; margin_top = margin_bottom = 0; - + if (want_margins) { margin_top = margin_bottom = (c.margin_width / 100) * Y; margin_left = round(( X* c.margin_width/100)/c.char_cell_granularity) \ @@ -100,31 +100,31 @@ void GTF_calcTimings(double X,double Y,double freq, int type, margin_right = margin_left; DEBUG_PRINTF("margin_left_right : %f\n",margin_right) DEBUG_PRINTF("margin_top_bottom : %f\n",margin_top) - } - - /* FIND TOTAL NUMBER OF ACTIVE PIXELS (IMAGE + MARGIN) [pixels] */ - + } + + /* FIND TOTAL NUMBER OF ACTIVE PIXELS (IMAGE + MARGIN) [pixels] */ + total_active_pixels = margin_left + margin_right + X; DEBUG_PRINTF("total_active_pixels: %f\n",total_active_pixels) if (type == GTF_PF) { - ideal_H_period = ((c.c-100)+(sqrt(((100-c.c)*(100-c.c) )+(0.4*c.m*(total_active_pixels + margin_left + margin_right) / freq))))/2/c.m*1000; - + ideal_H_period = ((c.c-100)+(sqrt(((100-c.c)*(100-c.c) )+(0.4*c.m*(total_active_pixels + margin_left + margin_right) / freq))))/2/c.m*1000; + DEBUG_PRINTF("ideal_H_period: %f\n",ideal_H_period) - + /* FIND IDEAL BLANKING DUTY CYCLE FROM FORMULA [%] */ ideal_duty_cycle = c.c - (c.m * ideal_H_period /1000); DEBUG_PRINTF("ideal_duty_cycle: %f\n",ideal_duty_cycle) /* FIND BLANKING TIME (TO NEAREST CHAR CELL) [pixels] */ - + blanking_time = round(total_active_pixels * ideal_duty_cycle \ / (100-ideal_duty_cycle) / (2*c.char_cell_granularity)) \ * (2*c.char_cell_granularity); DEBUG_PRINTF("blanking_time : %f\n",blanking_time ) - /* FIND TOTAL NUMBER OF PIXELS IN A LINE [pixels] */ + /* FIND TOTAL NUMBER OF PIXELS IN A LINE [pixels] */ H_total_pixels = total_active_pixels + blanking_time ; DEBUG_PRINTF("H_total_pixels: %f\n",H_total_pixels) H_freq = freq / H_total_pixels * 1000; @@ -133,20 +133,20 @@ void GTF_calcTimings(double X,double Y,double freq, int type, DEBUG_PRINTF("actual_H_period: %f\n",actual_H_period) sync_plus_BP = round(H_freq * c.min_Vsync_BP/1000); // sync_plus_BP = round( freq / H_total_pixels * c.min_Vsync_BP); - + DEBUG_PRINTF("sync_plus_BP: %f\n",sync_plus_BP) - } else if (type == GTF_VF) + } else if (type == GTF_VF) { - + /* ESTIMATE HORIZ. PERIOD [us] */ estimated_H_period = (( 1/RR ) - c.min_Vsync_BP/1000000 ) / (Y + (2 * margin_top) + c.min_front_porch + interlace) * 1000000; - + DEBUG_PRINTF("estimated_H_period: %f\n",estimated_H_period) /* FIND NUMBER OF LINES IN (SYNC + BACK PORCH) [lines] */ - + sync_plus_BP = round( c.min_Vsync_BP / estimated_H_period ); DEBUG_PRINTF("sync_plus_BP: %f\n",sync_plus_BP) @@ -155,9 +155,9 @@ void GTF_calcTimings(double X,double Y,double freq, int type, sync_plus_BP = round(freq * c.min_Vsync_BP/1000); DEBUG_PRINTF("sync_plus_BP: %f\n",sync_plus_BP) } - - - + + + /* FIND TOTAL NUMBER OF LINES IN VERTICAL FIELD */ V_total_lines_field = sync_plus_BP+interlace+margin_bottom+margin_top+Y+c.min_front_porch; @@ -166,11 +166,11 @@ void GTF_calcTimings(double X,double Y,double freq, int type, if (type == GTF_VF) { /* ESTIMATE VERTICAL FIELD RATE [hz] */ - + estimated_V_field_rate = 1 / estimated_H_period / V_total_lines_field * 1000000; DEBUG_PRINTF(" estimated_V_field_rate: %f\n", estimated_V_field_rate) /* FIND ACTUAL HORIZONTAL PERIOD [us] */ - + actual_H_period = estimated_H_period / (RR / estimated_V_field_rate); DEBUG_PRINTF("actual_H_period: %f\n",actual_H_period) /* FIND ACTUAL VERTICAL FIELD FREQUENCY [Hz] */ @@ -211,24 +211,24 @@ void GTF_calcTimings(double X,double Y,double freq, int type, { /* Hz */ actual_V_field_freq = freq / V_total_lines_field * 1000; - DEBUG_PRINTF("actual_V_field_freq: %f\n",actual_V_field_freq) + DEBUG_PRINTF("actual_V_field_freq: %f\n",actual_V_field_freq) } - - + + actual_V_frame_freq = actual_V_field_freq; /* FIND ACTUAL VERTICAL FRAME FREQUENCY [Hz]*/ - + if (want_interlace) actual_V_frame_freq = actual_V_field_freq / 2; DEBUG_PRINTF("actual_V_frame_freq: %f\n",actual_V_frame_freq) - + // V_freq = actual_V_frame_freq; -// DEBUG_PRINTF("V_freq %f\n",V_freq) +// DEBUG_PRINTF("V_freq %f\n",V_freq) + - if (!(type == GTF_PF)) - { - /* FIND TOTAL NUMBER OF PIXELS IN A LINE [pixels] */ + { + /* FIND TOTAL NUMBER OF PIXELS IN A LINE [pixels] */ H_total_pixels = total_active_pixels + blanking_time ; DEBUG_PRINTF("H_total_pixels: %f\n",H_total_pixels) if (type == GTF_VF) @@ -245,15 +245,15 @@ void GTF_calcTimings(double X,double Y,double freq, int type, } /* FIND ACTUAL HORIZONTAL FREQUENCY [KHz] */ - + H_freq = 1000 / actual_H_period; DEBUG_PRINTF("H_freq %f\n",H_freq) - + } /* FIND NUMBER OF LINES IN BACK PORCH [lines] */ - + BP = sync_plus_BP - c.Vsync_need; DEBUG_PRINTF("BP: %f\n",BP) @@ -264,27 +264,27 @@ void GTF_calcTimings(double X,double Y,double freq, int type, /* FIND FRONT H PORCH(TO NEAREST CHAR CELL) */ H_front_porch = (blanking_time/2) - H_sync_width; - DEBUG_PRINTF("H_front_porch %f\n",H_front_porch) + DEBUG_PRINTF("H_front_porch %f\n",H_front_porch) /* FIND BACK H PORCH(TO NEAREST CHAR CELL) */ H_back_porch = H_sync_width + H_front_porch; - DEBUG_PRINTF("H_back_porch%f\n",H_back_porch) + DEBUG_PRINTF("H_back_porch%f\n",H_back_porch) H_sync_start = H_total_pixels - (H_sync_width + H_back_porch); DEBUG_PRINTF("H_sync_start %f\n",H_sync_start) H_sync_end = H_total_pixels - H_back_porch; - DEBUG_PRINTF("H_sync_end %f\n",H_sync_end) - + DEBUG_PRINTF("H_sync_end %f\n",H_sync_end) + V_back_porch = interlace + BP; DEBUG_PRINTF("V_back_porch%f\n",V_back_porch) V_front_porch = interlace + c.min_front_porch; - DEBUG_PRINTF("V_front_porch%f\n",V_front_porch) - + DEBUG_PRINTF("V_front_porch%f\n",V_front_porch) + V_sync_width = c.Vsync_need; V_sync_start = V_total_lines_field - (V_sync_width + V_back_porch); - DEBUG_PRINTF("V_sync_start %f\n",V_sync_start) + DEBUG_PRINTF("V_sync_start %f\n",V_sync_start) V_sync_end = V_total_lines_field - V_back_porch; - DEBUG_PRINTF("V_sync_end %f\n",V_sync_end) - + DEBUG_PRINTF("V_sync_end %f\n",V_sync_end) + result->hTotal = H_total_pixels; result-> hSyncStart = H_sync_start; /* Horizontal sync start in pixels */ result-> hSyncEnd = H_sync_end; /* Horizontal sync end in pixels */ @@ -292,15 +292,15 @@ void GTF_calcTimings(double X,double Y,double freq, int type, result-> vSyncStart = V_sync_start; /* Vertical sync start in lines */ result-> vSyncEnd = V_sync_end; /* Vertical sync end in lines */ result-> Flags = (result->Flags)|VESA_CRTC_HSYNC_NEG; /* Flags (Interlaced, Double Scan etc) */ - - if (want_interlace) + + if (want_interlace) { result->Flags = (result->Flags) | VESA_CRTC_INTERLACED; } - + result-> PixelClock = pixel_freq*1000000; /* Pixel clock in units of Hz */ result-> RefreshRate = actual_V_frame_freq*100;/* Refresh rate in units of 0.01 Hz*/ - + } |