mirror of https://github.com/OpenTTD/OpenTTD
(svn r19670) -Codechange: Add CeilDiv() and RoundDiv() to simplify integer divisions with rounding.
parent
2330851d1d
commit
2e90f7f8b9
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@ -1061,7 +1061,7 @@ static bool AircraftController(Aircraft *v)
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/* Only start lowering when we're sufficiently close for a 1:1 glide */
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if (delta >= t) {
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z -= ((z - curz) + t - 1) / t;
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z -= CeilDiv(z - curz, t);
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}
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if (z < curz) z = curz;
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}
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@ -412,7 +412,7 @@ static CommandCost ReplaceChain(Vehicle **chain, DoCommandFlag flags, bool wagon
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if (old_head->type == VEH_TRAIN) {
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/* Store the length of the old vehicle chain, rounded up to whole tiles */
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uint16 old_total_length = (Train::From(old_head)->tcache.cached_total_length + TILE_SIZE - 1) / TILE_SIZE * TILE_SIZE;
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uint16 old_total_length = CeilDiv(Train::From(old_head)->tcache.cached_total_length, TILE_SIZE) * TILE_SIZE;
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int num_units = 0; ///< Number of units in the chain
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for (Train *w = Train::From(old_head); w != NULL; w = w->GetNextUnit()) num_units++;
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@ -318,4 +318,26 @@ static FORCEINLINE uint ToPercent16(uint i)
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int LeastCommonMultiple(int a, int b);
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int GreatestCommonDivisor(int a, int b);
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/**
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* Computes ceil(a / b) for non-negative a and b.
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* @param a Numerator
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* @param b Denominator
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* @return Quotient, rounded up
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*/
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static FORCEINLINE uint CeilDiv(uint a, uint b)
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{
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return (a + b - 1) / b;
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}
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/**
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* Computes round(a / b) for non-negative a and b.
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* @param a Numerator
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* @param b Denominator
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* @return Quotient, rounded to nearest
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*/
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static FORCEINLINE uint RoundDiv(uint a, uint b)
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{
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return (a + b / 2) / b;
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}
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#endif /* MATH_FUNC_HPP */
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@ -259,7 +259,7 @@ struct DepotWindow : Window {
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DrawTrainImage(u, image_left + (rtl ? 0 : x_space), image_right - (rtl ? x_space : 0), sprite_y - 1, this->sel, free_wagon ? 0 : this->hscroll.GetPosition());
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/* Number of wagons relative to a standard length wagon (rounded up) */
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SetDParam(0, (u->tcache.cached_total_length + 7) / 8);
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SetDParam(0, CeilDiv(u->tcache.cached_total_length, 8));
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DrawString(rtl ? left + WD_FRAMERECT_LEFT : right - this->count_width, rtl ? left + this->count_width : right - WD_FRAMERECT_RIGHT, y + (this->resize.step_height - FONT_HEIGHT_SMALL) / 2, STR_TINY_BLACK_COMA, TC_FROMSTRING, SA_RIGHT); // Draw the counter
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break;
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}
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@ -692,7 +692,7 @@ struct DepotWindow : Window {
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this->vscroll.SetCount(this->vehicle_list.Length() + this->wagon_list.Length() + 1);
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this->hscroll.SetCount(max_width);
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} else {
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this->vscroll.SetCount((this->vehicle_list.Length() + this->hscroll.GetCapacity() - 1) / this->hscroll.GetCapacity());
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this->vscroll.SetCount(CeilDiv(this->vehicle_list.Length(), this->hscroll.GetCapacity()));
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}
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/* Setup disabled buttons. */
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@ -1165,7 +1165,7 @@ static void LoadUnloadVehicle(Vehicle *v, int *cargo_left)
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byte load_amount = e->info.load_amount;
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/* The default loadamount for mail is 1/4 of the load amount for passengers */
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if (v->type == VEH_AIRCRAFT && !Aircraft::From(v)->IsNormalAircraft()) load_amount = (load_amount + 3) / 4;
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if (v->type == VEH_AIRCRAFT && !Aircraft::From(v)->IsNormalAircraft()) load_amount = CeilDiv(load_amount, 4);
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if (_settings_game.order.gradual_loading && HasBit(e->info.callback_mask, CBM_VEHICLE_LOAD_AMOUNT)) {
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uint16 cb_load_amount = GetVehicleCallback(CBID_VEHICLE_LOAD_AMOUNT, 0, 0, v->engine_type, v);
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@ -550,8 +550,7 @@ static int DrawString(int left, int right, int top, char *str, const char *last,
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break;
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case SA_CENTER:
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/* The second + 1 is to round to the closest number */
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left = (initial_right + 1 + initial_left - w + 1) / 2;
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left = RoundDiv(initial_right + 1 + initial_left - w, 2);
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/* right + 1 = left + w */
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right = left + w - 1;
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break;
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@ -824,7 +823,7 @@ int DrawStringMultiLine(int left, int right, int top, int bottom, StringID str,
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total_height = (num + 1) * mt;
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}
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int y = (align == SA_CENTER) ? (bottom + top - total_height + 1) / 2 : top;
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int y = (align == SA_CENTER) ? RoundDiv(bottom + top - total_height, 2) : top;
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const char *src = buffer;
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for (;;) {
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@ -1324,8 +1323,8 @@ byte GetDigitWidth(FontSize size)
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void ScreenSizeChanged()
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{
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_dirty_bytes_per_line = (_screen.width + DIRTY_BLOCK_WIDTH - 1) / DIRTY_BLOCK_WIDTH;
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_dirty_blocks = ReallocT<byte>(_dirty_blocks, _dirty_bytes_per_line * ((_screen.height + DIRTY_BLOCK_HEIGHT - 1) / DIRTY_BLOCK_HEIGHT));
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_dirty_bytes_per_line = CeilDiv(_screen.width, DIRTY_BLOCK_WIDTH);
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_dirty_blocks = ReallocT<byte>(_dirty_blocks, _dirty_bytes_per_line * CeilDiv(_screen.height, DIRTY_BLOCK_HEIGHT));
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/* check the dirty rect */
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if (_invalid_rect.right >= _screen.width) _invalid_rect.right = _screen.width;
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@ -2332,8 +2332,8 @@ static void ChangeIndustryProduction(Industry *i, bool monthly)
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* For non-smooth economy these should always be synchronized with prod_level */
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if (recalculate_multipliers) {
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/* Rates are rounded up, so e.g. oilrig always produces some passengers */
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i->production_rate[0] = min((indspec->production_rate[0] * i->prod_level + PRODLEVEL_DEFAULT - 1) / PRODLEVEL_DEFAULT, 0xFF);
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i->production_rate[1] = min((indspec->production_rate[1] * i->prod_level + PRODLEVEL_DEFAULT - 1) / PRODLEVEL_DEFAULT, 0xFF);
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i->production_rate[0] = min(CeilDiv(indspec->production_rate[0] * i->prod_level, PRODLEVEL_DEFAULT), 0xFF);
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i->production_rate[1] = min(CeilDiv(indspec->production_rate[1] * i->prod_level, PRODLEVEL_DEFAULT), 0xFF);
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}
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/* Close if needed and allowed */
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@ -12,6 +12,7 @@
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#ifndef MAP_FUNC_H
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#define MAP_FUNC_H
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#include "core/math_func.hpp"
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#include "tile_type.h"
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#include "map_type.h"
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#include "direction_func.h"
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@ -126,9 +127,8 @@ static inline uint MapMaxY()
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static inline uint ScaleByMapSize(uint n)
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{
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/* Subtract 12 from shift in order to prevent integer overflow
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* for large values of n. It's safe since the min mapsize is 64x64.
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* Add (1<<4)-1 to round upwards. */
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return ((n << (MapLogX() + MapLogY() - 12)) + (1 << 4) - 1) >> 4;
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* for large values of n. It's safe since the min mapsize is 64x64. */
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return CeilDiv(n << (MapLogX() + MapLogY() - 12), 1 << 4);
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}
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@ -142,9 +142,8 @@ static inline uint ScaleByMapSize1D(uint n)
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{
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/* Normal circumference for the X+Y is 256+256 = 1<<9
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* Note, not actually taking the full circumference into account,
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* just half of it.
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* (1<<9) - 1 is there to scale upwards. */
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return ((n << MapLogX()) + (n << MapLogY()) + (1 << 9) - 1) >> 9;
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* just half of it. */
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return CeilDiv((n << MapLogX()) + (n << MapLogY()), 1 << 9);
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}
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/**
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@ -259,7 +259,7 @@ public:
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assert(v != NULL);
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assert(v->type == VEH_TRAIN);
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assert(v->tcache.cached_total_length != 0);
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int missing_platform_length = (v->tcache.cached_total_length + TILE_SIZE - 1) / TILE_SIZE - platform_length;
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int missing_platform_length = CeilDiv(v->tcache.cached_total_length, TILE_SIZE) - platform_length;
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if (missing_platform_length < 0) {
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/* apply penalty for longer platform than needed */
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cost += Yapf().PfGetSettings().rail_longer_platform_penalty + Yapf().PfGetSettings().rail_longer_platform_per_tile_penalty * -missing_platform_length;
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@ -984,7 +984,7 @@ public:
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*/
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inline uint GetMaxLegendHeight() const
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{
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uint num_rows = max(this->min_number_of_fixed_rows, (_smallmap_industry_count + this->min_number_of_columns - 1) / this->min_number_of_columns);
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uint num_rows = max(this->min_number_of_fixed_rows, CeilDiv(_smallmap_industry_count, this->min_number_of_columns));
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return WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM + num_rows * FONT_HEIGHT_SMALL;
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}
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@ -1010,7 +1010,7 @@ public:
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uint GetLegendHeight(uint width) const
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{
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uint num_columns = this->GetNumberColumnsLegend(width);
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uint num_rows = max(this->min_number_of_fixed_rows, (_smallmap_industry_count + num_columns - 1) / num_columns);
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uint num_rows = max(this->min_number_of_fixed_rows, CeilDiv(_smallmap_industry_count, num_columns));
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return WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM + num_rows * FONT_HEIGHT_SMALL;
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}
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@ -1067,7 +1067,7 @@ public:
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case SM_WIDGET_LEGEND: {
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uint columns = this->GetNumberColumnsLegend(r.right - r.left + 1);
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uint number_of_rows = max(this->map_type == SMT_INDUSTRY ? (_smallmap_industry_count + columns - 1) / columns : 0, this->min_number_of_fixed_rows);
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uint number_of_rows = max(this->map_type == SMT_INDUSTRY ? CeilDiv(_smallmap_industry_count, columns) : 0, this->min_number_of_fixed_rows);
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bool rtl = _dynlang.text_dir == TD_RTL;
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uint y_org = r.top + WD_FRAMERECT_TOP;
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uint x = rtl ? r.right - this->column_width - WD_FRAMERECT_RIGHT : r.left + WD_FRAMERECT_LEFT;
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@ -1195,7 +1195,7 @@ public:
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const NWidgetBase *wi = this->GetWidget<NWidgetBase>(SM_WIDGET_LEGEND); // Label panel
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uint line = (pt.y - wi->pos_y - WD_FRAMERECT_TOP) / FONT_HEIGHT_SMALL;
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uint columns = this->GetNumberColumnsLegend(wi->current_x);
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uint number_of_rows = max((_smallmap_industry_count + columns - 1) / columns, this->min_number_of_fixed_rows);
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uint number_of_rows = max(CeilDiv(_smallmap_industry_count, columns), this->min_number_of_fixed_rows);
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if (line >= number_of_rows) break;
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bool rtl = _dynlang.text_dir == TD_RTL;
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@ -1105,7 +1105,7 @@ struct StationViewWindow : public Window {
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}
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Rect s = {r.left + WD_FRAMERECT_LEFT, r.top + WD_FRAMERECT_TOP, r.right - WD_FRAMERECT_RIGHT, INT32_MAX};
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int bottom = DrawCargoListText(cargo_mask, s, STR_STATION_VIEW_ACCEPTS_CARGO);
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return (bottom - r.top - WD_FRAMERECT_TOP + FONT_HEIGHT_NORMAL - 1) / FONT_HEIGHT_NORMAL;
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return CeilDiv(bottom - r.top - WD_FRAMERECT_TOP, FONT_HEIGHT_NORMAL);
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}
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/** Draw cargo ratings in the #SVW_ACCEPTLIST widget.
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DrawString(r.left + WD_FRAMERECT_LEFT + 6, r.right - WD_FRAMERECT_RIGHT - 6, y, STR_STATION_VIEW_CARGO_RATING);
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y += FONT_HEIGHT_NORMAL;
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}
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return (y - r.top - WD_FRAMERECT_TOP + FONT_HEIGHT_NORMAL - 1) / FONT_HEIGHT_NORMAL;
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return CeilDiv(y - r.top - WD_FRAMERECT_TOP, FONT_HEIGHT_NORMAL);
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}
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void HandleCargoWaitingClick(int row)
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@ -649,8 +649,8 @@ struct ScenarioEditorLandscapeGenerationWindow : Window {
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{
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if (widget != ETTW_DOTS) return;
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int center_x = (r.left + r.right + 1) / 2;
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int center_y = (r.top + r.bottom + 1) / 2;
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int center_x = RoundDiv(r.left + r.right, 2);
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int center_y = RoundDiv(r.top + r.bottom, 2);
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int n = _terraform_size * _terraform_size;
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const int8 *coords = &_multi_terraform_coords[0][0];
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@ -279,7 +279,7 @@ void UpdateVehicleTimetable(Vehicle *v, bool travelling)
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/* Round the time taken up to the nearest day, as this will avoid
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* confusion for people who are timetabling in days, and can be
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* adjusted later by people who aren't. */
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time_taken = (((time_taken - 1) / DAY_TICKS) + 1) * DAY_TICKS;
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time_taken = CeilDiv(time_taken, DAY_TICKS) * DAY_TICKS;
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ChangeTimetable(v, v->cur_order_index, time_taken, travelling);
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}
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@ -1113,7 +1113,7 @@ class NWidgetMainToolbarContainer : public NWidgetToolbarContainer {
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};
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/* If at least BIGGEST_ARRANGEMENT fit, just spread all the buttons nicely */
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uint full_buttons = max((width + this->smallest_x - 1) / this->smallest_x, SMALLEST_ARRANGEMENT);
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uint full_buttons = max(CeilDiv(width, this->smallest_x), SMALLEST_ARRANGEMENT);
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if (full_buttons > BIGGEST_ARRANGEMENT) {
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button_count = arrangable_count = lengthof(arrange_all);
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spacer_count = this->spacers;
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@ -2478,7 +2478,7 @@ static void CalcRaildirsDrawstyle(TileHighlightData *thd, int x, int y, int meth
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* 2 tiles have a length of 1. To bias towards the ceiling we add
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* one before division. It feels more natural to count 3 lengths as 2 */
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if ((b & HT_DIR_MASK) != HT_DIR_X && (b & HT_DIR_MASK) != HT_DIR_Y) {
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distance = (distance + 1) / 2;
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distance = CeilDiv(distance, 2);
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}
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params[index++] = distance;
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