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Fix non-smooth text ticker + reduce line ticker code duplication

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This commit is contained in:
jdgleaver 2021-02-01 16:35:56 +00:00
parent d6c027be31
commit 95226b77a1
1 changed files with 45 additions and 53 deletions
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90
gfx/gfx_animation.c
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@ -40,6 +40,21 @@
* */
#define TICKER_PIXEL_PERIOD (16.666666666666668f)
/* Mean human reading speed for all western languages,
* characters per minute */
#define TICKER_CPM 1000.0f
/* Base time for which a line should be shown, in us */
#define TICKER_LINE_DURATION_US(line_len) ((line_len * 60.0f * 1000.0f * 1000.0f) / TICKER_CPM)
/* Base time for which a line should be shown, in ms */
#define TICKER_LINE_DURATION_MS(line_len) ((line_len * 60.0f * 1000.0f) / TICKER_CPM)
/* Ticker updates (nominally) once every TICKER_SPEED us
* > Base number of ticks for which line should be shown */
#define TICKER_LINE_DISPLAY_TICKS(line_len) ((size_t)(TICKER_LINE_DURATION_US(line_len) / (float)TICKER_SPEED))
/* Smooth ticker updates (nominally) once every TICKER_PIXEL_PERIOD ms
* > Base number of ticks for which text should scroll
* from one line to the next */
#define TICKER_LINE_SMOOTH_SCROLL_TICKS(line_len) ((size_t)(TICKER_LINE_DURATION_MS(line_len) / TICKER_PIXEL_PERIOD))
/* from https://github.com/kikito/tween.lua/blob/master/tween.lua */
static float easing_linear(float t, float b, float c, float d)
@ -268,26 +283,29 @@ static float easing_out_in_bounce(float t, float b, float c, float d)
return easing_in_bounce((t * 2) - d, b + c / 2, c / 2, d);
}
static size_t gfx_animation_ticker_generic(uint64_t idx,
size_t max_width, size_t *width)
static void gfx_animation_ticker_generic(uint64_t idx,
size_t max_width, size_t *offset, size_t *width)
{
int ticker_period = (int)(2 * (*width - max_width) + 4);
int phase = idx % ticker_period;
const int phase_left_stop = 2;
int phase_left_stop = 2;
int phase_left_moving = (int)(phase_left_stop + (*width - max_width));
int phase_right_stop = phase_left_moving + 2;
*width = max_width;
int left_offset = phase - phase_left_stop;
int right_offset = (int)((*width - max_width) - (phase - phase_right_stop));
if (phase < phase_left_stop)
return 0;
else if (phase < phase_left_moving) /* left offset */
return (phase - phase_left_stop);
*offset = 0;
else if (phase < phase_left_moving)
*offset = left_offset;
else if (phase < phase_right_stop)
return (*width - max_width);
*offset = *width - max_width;
else
*offset = right_offset;
/* right offset */
return (size_t)(int)((*width - max_width) - (phase - phase_right_stop));
*width = max_width;
}
static void gfx_animation_ticker_loop(uint64_t idx,
@ -735,14 +753,7 @@ static void gfx_animation_line_ticker_generic(uint64_t idx,
size_t line_len, size_t max_lines, size_t num_lines,
size_t *line_offset)
{
/* Mean human reading speed for all western languages,
* characters per minute */
float cpm = 1000.0f;
/* Base time for which a line should be shown, in us */
float line_duration = (line_len * 60.0f * 1000.0f * 1000.0f) / cpm;
/* Ticker updates (nominally) once every TICKER_SPEED us
* > Return base number of ticks for which line should be shown */
size_t line_ticks = (size_t)(line_duration / (float)TICKER_SPEED);
size_t line_ticks = TICKER_LINE_DISPLAY_TICKS(line_len);
/* Note: This function is only called if num_lines > max_lines */
size_t excess_lines = num_lines - max_lines;
/* Ticker will pause for one line duration when the first
@ -768,21 +779,16 @@ static void gfx_animation_line_ticker_generic(uint64_t idx,
*line_offset = (excess_lines * 2) - phase;
}
static size_t gfx_animation_line_ticker_loop(uint64_t idx,
static void gfx_animation_line_ticker_loop(uint64_t idx,
size_t line_len, size_t num_lines,
size_t *line_offset)
{
/* Mean human reading speed for all western languages,
* characters per minute */
float cpm = 1000.0f;
/* Base time for which a line should be shown, in us */
float line_duration = (line_len * 60.0f * 1000.0f * 1000.0f) / cpm;
/* Ticker updates (nominally) once every TICKER_SPEED us
* > Return base number of ticks for which line should be shown */
size_t line_ticks = (size_t)(line_duration / (float)TICKER_SPEED);
size_t line_ticks = TICKER_LINE_DISPLAY_TICKS(line_len);
size_t ticker_period = num_lines + 1;
size_t phase = (idx / line_ticks) % ticker_period;
return phase;
/* In this case, line_offset is simply equal to the phase */
*line_offset = phase;
}
static void set_line_smooth_fade_parameters(
@ -844,15 +850,7 @@ static void gfx_animation_line_ticker_smooth_generic(uint64_t idx,
size_t *bottom_fade_line_offset, float *bottom_fade_y_offset,
float *bottom_fade_alpha)
{
/* Mean human reading speed for all western languages,
* characters per minute */
float cpm = 1000.0f;
/* Base time for which a line should be shown, in ms */
float line_duration = (line_len * 60.0f * 1000.0f) / cpm;
/* Ticker updates (nominally) once every TICKER_PIXEL_PERIOD ms
* > Return base number of ticks for which text should scroll
* from one line to the next */
size_t scroll_ticks = (size_t)(line_duration / TICKER_PIXEL_PERIOD);
size_t scroll_ticks = TICKER_LINE_SMOOTH_SCROLL_TICKS(line_len);
/* Note: This function is only called if num_lines > max_display_lines */
size_t excess_lines = num_lines - max_display_lines;
/* Ticker will pause for one line duration when the first
@ -938,15 +936,7 @@ static void gfx_animation_line_ticker_smooth_loop(uint64_t idx,
size_t *top_fade_line_offset, float *top_fade_y_offset, float *top_fade_alpha,
size_t *bottom_fade_line_offset, float *bottom_fade_y_offset, float *bottom_fade_alpha)
{
/* Mean human reading speed for all western languages,
* characters per minute */
float cpm = 1000.0f;
/* Base time for which a line should be shown, in ms */
float line_duration = (line_len * 60.0f * 1000.0f) / cpm;
/* Ticker updates (nominally) once every TICKER_PIXEL_PERIOD ms
* > Return base number of ticks for which text should scroll
* from one line to the next */
size_t scroll_ticks = (size_t)(line_duration / TICKER_PIXEL_PERIOD);
size_t scroll_ticks = TICKER_LINE_SMOOTH_SCROLL_TICKS(line_len);
size_t ticker_period = (num_lines + 1) * scroll_ticks;
size_t phase = idx % ticker_period;
size_t line_phase = phase % scroll_ticks;
@ -1438,9 +1428,12 @@ bool gfx_animation_ticker(gfx_animation_ctx_ticker_t *ticker)
case TICKER_TYPE_BOUNCE:
default:
{
size_t offset = gfx_animation_ticker_generic(
size_t offset = 0;
gfx_animation_ticker_generic(
ticker->idx,
ticker->len,
&offset,
&str_len);
utf8cpy(
@ -1895,8 +1888,7 @@ bool gfx_animation_line_ticker(gfx_animation_ctx_line_ticker_t *line_ticker)
switch (line_ticker->type_enum)
{
case TICKER_TYPE_LOOP:
/* In this case, line_offset is simply equal to the phase */
line_offset = gfx_animation_line_ticker_loop(
gfx_animation_line_ticker_loop(
line_ticker->idx,
line_ticker->line_len,
lines.size,