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ass_render.c
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ass_render.c
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/*
* Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
*
* This file is part of libass.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#include "ass_compat.h"
#include <assert.h>
#include <math.h>
#include <string.h>
#include <stdbool.h>
#include "ass_outline.h"
#include "ass_render.h"
#include "ass_parse.h"
#include "ass_priv.h"
#include "ass_shaper.h"
#define MAX_GLYPHS_INITIAL 1024
#define MAX_LINES_INITIAL 64
#define MAX_BITMAPS_INITIAL 16
#define MAX_SUB_BITMAPS_INITIAL 64
#define SUBPIXEL_MASK 63
#define STROKER_PRECISION 16 // stroker error in integer units, unrelated to final accuracy
#define RASTERIZER_PRECISION 16 // rasterizer spline approximation error in 1/64 pixel units
#define POSITION_PRECISION 8.0 // rough estimate of transform error in 1/64 pixel units
#define MAX_PERSP_SCALE 16.0
#define SUBPIXEL_ORDER 3 // ~ log2(64 / POSITION_PRECISION)
#define BLUR_PRECISION (1.0 / 256) // blur error as fraction of full input range
ASS_Renderer *ass_renderer_init(ASS_Library *library)
{
int error;
FT_Library ft;
ASS_Renderer *priv = 0;
int vmajor, vminor, vpatch;
error = FT_Init_FreeType(&ft);
if (error) {
ass_msg(library, MSGL_FATAL, "%s failed", "FT_Init_FreeType");
goto fail;
}
FT_Library_Version(ft, &vmajor, &vminor, &vpatch);
ass_msg(library, MSGL_V, "Raster: FreeType %d.%d.%d",
vmajor, vminor, vpatch);
priv = calloc(1, sizeof(ASS_Renderer));
if (!priv) {
FT_Done_FreeType(ft);
goto fail;
}
priv->library = library;
priv->ftlibrary = ft;
// images_root and related stuff is zero-filled in calloc
#if (defined(__i386__) || defined(__x86_64__)) && CONFIG_ASM
if (has_avx2())
priv->engine = &ass_bitmap_engine_avx2;
else if (has_sse2())
priv->engine = &ass_bitmap_engine_sse2;
else
priv->engine = &ass_bitmap_engine_c;
#else
priv->engine = &ass_bitmap_engine_c;
#endif
if (!rasterizer_init(&priv->rasterizer, priv->engine->tile_order,
RASTERIZER_PRECISION))
goto fail;
priv->cache.font_cache = ass_font_cache_create();
priv->cache.bitmap_cache = ass_bitmap_cache_create();
priv->cache.composite_cache = ass_composite_cache_create();
priv->cache.outline_cache = ass_outline_cache_create();
if (!priv->cache.font_cache || !priv->cache.bitmap_cache || !priv->cache.composite_cache || !priv->cache.outline_cache)
goto fail;
priv->cache.glyph_max = GLYPH_CACHE_MAX;
priv->cache.bitmap_max_size = BITMAP_CACHE_MAX_SIZE;
priv->cache.composite_max_size = COMPOSITE_CACHE_MAX_SIZE;
priv->text_info.max_bitmaps = MAX_BITMAPS_INITIAL;
priv->text_info.max_glyphs = MAX_GLYPHS_INITIAL;
priv->text_info.max_lines = MAX_LINES_INITIAL;
priv->text_info.n_bitmaps = 0;
priv->text_info.combined_bitmaps = calloc(MAX_BITMAPS_INITIAL, sizeof(CombinedBitmapInfo));
priv->text_info.glyphs = calloc(MAX_GLYPHS_INITIAL, sizeof(GlyphInfo));
priv->text_info.lines = calloc(MAX_LINES_INITIAL, sizeof(LineInfo));
if (!priv->text_info.combined_bitmaps || !priv->text_info.glyphs || !priv->text_info.lines)
goto fail;
priv->settings.font_size_coeff = 1.;
priv->settings.selective_style_overrides = ASS_OVERRIDE_BIT_SELECTIVE_FONT_SCALE;
if (!(priv->shaper = ass_shaper_new()))
goto fail;
ass_shaper_info(library);
#ifdef CONFIG_HARFBUZZ
priv->settings.shaper = ASS_SHAPING_COMPLEX;
#else
priv->settings.shaper = ASS_SHAPING_SIMPLE;
#endif
ass_msg(library, MSGL_V, "Initialized");
return priv;
fail:
ass_msg(library, MSGL_ERR, "Initialization failed");
ass_renderer_done(priv);
return NULL;
}
void ass_renderer_done(ASS_Renderer *render_priv)
{
if (!render_priv)
return;
ass_frame_unref(render_priv->images_root);
ass_frame_unref(render_priv->prev_images_root);
ass_cache_done(render_priv->cache.composite_cache);
ass_cache_done(render_priv->cache.bitmap_cache);
ass_cache_done(render_priv->cache.outline_cache);
ass_shaper_free(render_priv->shaper);
ass_cache_done(render_priv->cache.font_cache);
rasterizer_done(&render_priv->rasterizer);
if (render_priv->fontselect)
ass_fontselect_free(render_priv->fontselect);
if (render_priv->ftlibrary)
FT_Done_FreeType(render_priv->ftlibrary);
free(render_priv->eimg);
free(render_priv->text_info.glyphs);
free(render_priv->text_info.lines);
free(render_priv->text_info.combined_bitmaps);
free(render_priv->settings.default_font);
free(render_priv->settings.default_family);
free(render_priv->user_override_style.FontName);
free(render_priv);
}
/**
* \brief Create a new ASS_Image
* Parameters are the same as ASS_Image fields.
*/
static ASS_Image *my_draw_bitmap(unsigned char *bitmap, int bitmap_w,
int bitmap_h, int stride, int dst_x,
int dst_y, uint32_t color,
CompositeHashValue *source)
{
ASS_ImagePriv *img = malloc(sizeof(ASS_ImagePriv));
if (!img) {
if (!source)
ass_aligned_free(bitmap);
return NULL;
}
img->result.w = bitmap_w;
img->result.h = bitmap_h;
img->result.stride = stride;
img->result.bitmap = bitmap;
img->result.color = color;
img->result.dst_x = dst_x;
img->result.dst_y = dst_y;
img->source = source;
ass_cache_inc_ref(source);
img->buffer = source ? NULL : bitmap;
img->ref_count = 0;
return &img->result;
}
/**
* \brief Mapping between script and screen coordinates
*/
static double x2scr_pos(ASS_Renderer *render_priv, double x)
{
return x * render_priv->orig_width / render_priv->font_scale_x / render_priv->track->PlayResX +
render_priv->settings.left_margin;
}
static double x2scr_left(ASS_Renderer *render_priv, double x)
{
if (render_priv->state.explicit || !render_priv->settings.use_margins)
return x2scr_pos(render_priv, x);
return x * render_priv->fit_width / render_priv->font_scale_x /
render_priv->track->PlayResX;
}
static double x2scr_right(ASS_Renderer *render_priv, double x)
{
if (render_priv->state.explicit || !render_priv->settings.use_margins)
return x2scr_pos(render_priv, x);
return x * render_priv->fit_width / render_priv->font_scale_x /
render_priv->track->PlayResX +
(render_priv->width - render_priv->fit_width);
}
static double x2scr_pos_scaled(ASS_Renderer *render_priv, double x)
{
return x * render_priv->orig_width / render_priv->track->PlayResX +
render_priv->settings.left_margin;
}
static double x2scr_left_scaled(ASS_Renderer *render_priv, double x)
{
if (render_priv->state.explicit || !render_priv->settings.use_margins)
return x2scr_pos_scaled(render_priv, x);
return x * render_priv->fit_width /
render_priv->track->PlayResX;
}
static double x2scr_right_scaled(ASS_Renderer *render_priv, double x)
{
if (render_priv->state.explicit || !render_priv->settings.use_margins)
return x2scr_pos_scaled(render_priv, x);
return x * render_priv->fit_width /
render_priv->track->PlayResX +
(render_priv->width - render_priv->fit_width);
}
/**
* \brief Mapping between script and screen coordinates
*/
static double y2scr_pos(ASS_Renderer *render_priv, double y)
{
return y * render_priv->orig_height / render_priv->track->PlayResY +
render_priv->settings.top_margin;
}
static double y2scr(ASS_Renderer *render_priv, double y)
{
if (render_priv->state.explicit || !render_priv->settings.use_margins)
return y2scr_pos(render_priv, y);
return y * render_priv->fit_height /
render_priv->track->PlayResY +
(render_priv->height - render_priv->fit_height) * 0.5;
}
// the same for toptitles
static double y2scr_top(ASS_Renderer *render_priv, double y)
{
if (render_priv->state.explicit || !render_priv->settings.use_margins)
return y2scr_pos(render_priv, y);
return y * render_priv->fit_height /
render_priv->track->PlayResY;
}
// the same for subtitles
static double y2scr_sub(ASS_Renderer *render_priv, double y)
{
if (render_priv->state.explicit || !render_priv->settings.use_margins)
return y2scr_pos(render_priv, y);
return y * render_priv->fit_height /
render_priv->track->PlayResY +
(render_priv->height - render_priv->fit_height);
}
/*
* \brief Convert bitmap glyphs into ASS_Image list with inverse clipping
*
* Inverse clipping with the following strategy:
* - find rectangle from (x0, y0) to (cx0, y1)
* - find rectangle from (cx0, y0) to (cx1, cy0)
* - find rectangle from (cx0, cy1) to (cx1, y1)
* - find rectangle from (cx1, y0) to (x1, y1)
* These rectangles can be invalid and in this case are discarded.
* Afterwards, they are clipped against the screen coordinates.
* In an additional pass, the rectangles need to be split up left/right for
* karaoke effects. This can result in a lot of bitmaps (6 to be exact).
*/
static ASS_Image **render_glyph_i(ASS_Renderer *render_priv,
Bitmap *bm, int dst_x, int dst_y,
uint32_t color, uint32_t color2, int brk,
ASS_Image **tail, unsigned type,
CompositeHashValue *source)
{
int i, j, x0, y0, x1, y1, cx0, cy0, cx1, cy1, sx, sy, zx, zy;
Rect r[4];
ASS_Image *img;
dst_x += bm->left;
dst_y += bm->top;
// we still need to clip against screen boundaries
zx = x2scr_pos_scaled(render_priv, 0);
zy = y2scr_pos(render_priv, 0);
sx = x2scr_pos_scaled(render_priv, render_priv->track->PlayResX);
sy = y2scr_pos(render_priv, render_priv->track->PlayResY);
x0 = 0;
y0 = 0;
x1 = bm->w;
y1 = bm->h;
cx0 = render_priv->state.clip_x0 - dst_x;
cy0 = render_priv->state.clip_y0 - dst_y;
cx1 = render_priv->state.clip_x1 - dst_x;
cy1 = render_priv->state.clip_y1 - dst_y;
// calculate rectangles and discard invalid ones while we're at it.
i = 0;
r[i].x0 = x0;
r[i].y0 = y0;
r[i].x1 = (cx0 > x1) ? x1 : cx0;
r[i].y1 = y1;
if (r[i].x1 > r[i].x0 && r[i].y1 > r[i].y0) i++;
r[i].x0 = (cx0 < 0) ? x0 : cx0;
r[i].y0 = y0;
r[i].x1 = (cx1 > x1) ? x1 : cx1;
r[i].y1 = (cy0 > y1) ? y1 : cy0;
if (r[i].x1 > r[i].x0 && r[i].y1 > r[i].y0) i++;
r[i].x0 = (cx0 < 0) ? x0 : cx0;
r[i].y0 = (cy1 < 0) ? y0 : cy1;
r[i].x1 = (cx1 > x1) ? x1 : cx1;
r[i].y1 = y1;
if (r[i].x1 > r[i].x0 && r[i].y1 > r[i].y0) i++;
r[i].x0 = (cx1 < 0) ? x0 : cx1;
r[i].y0 = y0;
r[i].x1 = x1;
r[i].y1 = y1;
if (r[i].x1 > r[i].x0 && r[i].y1 > r[i].y0) i++;
// clip each rectangle to screen coordinates
for (j = 0; j < i; j++) {
r[j].x0 = (r[j].x0 + dst_x < zx) ? zx - dst_x : r[j].x0;
r[j].y0 = (r[j].y0 + dst_y < zy) ? zy - dst_y : r[j].y0;
r[j].x1 = (r[j].x1 + dst_x > sx) ? sx - dst_x : r[j].x1;
r[j].y1 = (r[j].y1 + dst_y > sy) ? sy - dst_y : r[j].y1;
}
// draw the rectangles
for (j = 0; j < i; j++) {
int lbrk = brk;
// kick out rectangles that are invalid now
if (r[j].x1 <= r[j].x0 || r[j].y1 <= r[j].y0)
continue;
// split up into left and right for karaoke, if needed
if (lbrk > r[j].x0) {
if (lbrk > r[j].x1) lbrk = r[j].x1;
img = my_draw_bitmap(bm->buffer + r[j].y0 * bm->stride + r[j].x0,
lbrk - r[j].x0, r[j].y1 - r[j].y0, bm->stride,
dst_x + r[j].x0, dst_y + r[j].y0, color, source);
if (!img) break;
img->type = type;
*tail = img;
tail = &img->next;
}
if (lbrk < r[j].x1) {
if (lbrk < r[j].x0) lbrk = r[j].x0;
img = my_draw_bitmap(bm->buffer + r[j].y0 * bm->stride + lbrk,
r[j].x1 - lbrk, r[j].y1 - r[j].y0, bm->stride,
dst_x + lbrk, dst_y + r[j].y0, color2, source);
if (!img) break;
img->type = type;
*tail = img;
tail = &img->next;
}
}
return tail;
}
/**
* \brief convert bitmap glyph into ASS_Image struct(s)
* \param bit freetype bitmap glyph, FT_PIXEL_MODE_GRAY
* \param dst_x bitmap x coordinate in video frame
* \param dst_y bitmap y coordinate in video frame
* \param color first color, RGBA
* \param color2 second color, RGBA
* \param brk x coordinate relative to glyph origin, color is used to the left of brk, color2 - to the right
* \param tail pointer to the last image's next field, head of the generated list should be stored here
* \return pointer to the new list tail
* Performs clipping. Uses my_draw_bitmap for actual bitmap convertion.
*/
static ASS_Image **
render_glyph(ASS_Renderer *render_priv, Bitmap *bm, int dst_x, int dst_y,
uint32_t color, uint32_t color2, int brk, ASS_Image **tail,
unsigned type, CompositeHashValue *source)
{
// Inverse clipping in use?
if (render_priv->state.clip_mode)
return render_glyph_i(render_priv, bm, dst_x, dst_y, color, color2,
brk, tail, type, source);
// brk is relative to dst_x
// color = color left of brk
// color2 = color right of brk
int b_x0, b_y0, b_x1, b_y1; // visible part of the bitmap
int clip_x0, clip_y0, clip_x1, clip_y1;
int tmp;
ASS_Image *img;
dst_x += bm->left;
dst_y += bm->top;
brk -= bm->left;
// clipping
clip_x0 = FFMINMAX(render_priv->state.clip_x0, 0, render_priv->width);
clip_y0 = FFMINMAX(render_priv->state.clip_y0, 0, render_priv->height);
clip_x1 = FFMINMAX(render_priv->state.clip_x1, 0, render_priv->width);
clip_y1 = FFMINMAX(render_priv->state.clip_y1, 0, render_priv->height);
b_x0 = 0;
b_y0 = 0;
b_x1 = bm->w;
b_y1 = bm->h;
tmp = dst_x - clip_x0;
if (tmp < 0)
b_x0 = -tmp;
tmp = dst_y - clip_y0;
if (tmp < 0)
b_y0 = -tmp;
tmp = clip_x1 - dst_x - bm->w;
if (tmp < 0)
b_x1 = bm->w + tmp;
tmp = clip_y1 - dst_y - bm->h;
if (tmp < 0)
b_y1 = bm->h + tmp;
if ((b_y0 >= b_y1) || (b_x0 >= b_x1))
return tail;
if (brk > b_x0) { // draw left part
if (brk > b_x1)
brk = b_x1;
img = my_draw_bitmap(bm->buffer + bm->stride * b_y0 + b_x0,
brk - b_x0, b_y1 - b_y0, bm->stride,
dst_x + b_x0, dst_y + b_y0, color, source);
if (!img) return tail;
img->type = type;
*tail = img;
tail = &img->next;
}
if (brk < b_x1) { // draw right part
if (brk < b_x0)
brk = b_x0;
img = my_draw_bitmap(bm->buffer + bm->stride * b_y0 + brk,
b_x1 - brk, b_y1 - b_y0, bm->stride,
dst_x + brk, dst_y + b_y0, color2, source);
if (!img) return tail;
img->type = type;
*tail = img;
tail = &img->next;
}
return tail;
}
static bool quantize_transform(double m[3][3], ASS_Vector *pos,
ASS_DVector *offset, bool first,
BitmapHashKey *key)
{
// Full transform:
// x_out = (m_xx * x + m_xy * y + m_xz) / z,
// y_out = (m_yx * x + m_yy * y + m_yz) / z,
// z = m_zx * x + m_zy * y + m_zz.
const double max_val = 1000000;
const ASS_Rect *bbox = &key->outline->cbox;
double x0 = (bbox->x_min + bbox->x_max) / 2.0;
double y0 = (bbox->y_min + bbox->y_max) / 2.0;
double dx = (bbox->x_max - bbox->x_min) / 2.0 + 64;
double dy = (bbox->y_max - bbox->y_min) / 2.0 + 64;
// Change input coordinates' origin to (x0, y0),
// after that transformation x:[-dx, dx], y:[-dy, dy],
// max|x| = dx and max|y| = dy.
for (int i = 0; i < 3; i++)
m[i][2] += m[i][0] * x0 + m[i][1] * y0;
if (m[2][2] <= 0)
return false;
double w = 1 / m[2][2];
// Transformed center of bounding box
double center[2] = { m[0][2] * w, m[1][2] * w };
// Change output coordinates' origin to center,
// m_xz and m_yz is skipped as it becomes 0 and no longer needed.
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++)
m[i][j] -= m[2][j] * center[i];
double delta[2] = {0};
if (!first) {
delta[0] = offset->x;
delta[1] = offset->y;
}
int32_t qr[2]; // quantized center position
for (int i = 0; i < 2; i++) {
center[i] /= 64 >> SUBPIXEL_ORDER;
center[i] -= delta[i];
if (!(fabs(center[i]) < max_val))
return false;
qr[i] = lrint(center[i]);
}
// Minimal bounding box z coordinate
double z0 = m[2][2] - fabs(m[2][0]) * dx - fabs(m[2][1]) * dy;
// z0 clamped to z_center / MAX_PERSP_SCALE to mitigate problems with small z
w = 1.0 / POSITION_PRECISION / FFMAX(z0, m[2][2] / MAX_PERSP_SCALE);
double mul[2] = { dx * w, dy * w }; // 1 / q_x, 1 / q_y
// z0 = m_zz - |m_zx| * dx - |m_zy| * dy,
// m_zz = z0 + |m_zx| * dx + |m_zy| * dy,
// z = m_zx * x + m_zy * y + m_zz
// = m_zx * (x + sign(m_zx) * dx) + m_zy * (y + sign(m_zy) * dy) + z0.
// D(f)--absolute value of error in quantity f
// as function of error in matrix coefficients, i. e. D(m_??).
// Error in constant is zero, i. e. D(dx) = D(dy) = D(z0) = 0.
// In the following calculation errors are considered small
// and second- and higher-order terms are dropped.
// That approximation is valid as long as glyph dimensions are larger than couple of pixels.
// Therefore standard relations for derivatives can be used for D(?):
// D(A * B) <= D(A) * max|B| + max|A| * D(B),
// D(1 / C) <= D(C) * max|1 / C^2|.
// D(x_out) = D((m_xx * x + m_xy * y) / z)
// <= D(m_xx * x + m_xy * y) * max|1 / z| + max|m_xx * x + m_xy * y| * D(1 / z)
// <= (D(m_xx) * dx + D(m_xy) * dy) / z0 + (|m_xx| * dx + |m_xy| * dy) * D(z) / z0^2,
// D(y_out) = D((m_yx * x + m_yy * y) / z)
// <= D(m_yx * x + m_yy * y) * max|1 / z| + max|m_yx * x + m_yy * y| * D(1 / z)
// <= (D(m_yx) * dx + D(m_yy) * dy) / z0 + (|m_yx| * dx + |m_yy| * dy) * D(z) / z0^2,
// |m_xx| * dx + |m_xy| * dy = x_lim,
// |m_yx| * dx + |m_yy| * dy = y_lim,
// D(z) <= 2 * (D(m_zx) * dx + D(m_zy) * dy),
// D(x_out) <= (D(m_xx) * dx + D(m_xy) * dy) / z0
// + 2 * (D(m_zx) * dx + D(m_zy) * dy) * x_lim / z0^2,
// D(y_out) <= (D(m_yx) * dx + D(m_yy) * dy) / z0
// + 2 * (D(m_zx) * dx + D(m_zy) * dy) * y_lim / z0^2.
// To estimate acceptable error in matrix coefficient
// set error in all other coefficients to zero and solve system
// D(x_out) <= ACCURACY & D(y_out) <= ACCURACY for desired D(m_??).
// ACCURACY here is some part of total error, i. e. ACCURACY ~ POSITION_PRECISION.
// Note that POSITION_PRECISION isn't total error, it's convenient constant.
// True error can be up to several POSITION_PRECISION.
// Quantization steps (ACCURACY ~ POSITION_PRECISION):
// D(m_xx), D(m_yx) ~ q_x = POSITION_PRECISION * z0 / dx,
// D(m_xy), D(m_yy) ~ q_y = POSITION_PRECISION * z0 / dy,
// qm_xx = round(m_xx / q_x), qm_xy = round(m_xy / q_y),
// qm_yx = round(m_yx / q_x), qm_yy = round(m_yy / q_y).
int32_t qm[3][2];
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++) {
double val = m[i][j] * mul[j];
if (!(fabs(val) < max_val))
return false;
qm[i][j] = lrint(val);
}
// x_lim = |m_xx| * dx + |m_xy| * dy
// ~= |qm_xx| * q_x * dx + |qm_xy| * q_y * dy
// = (|qm_xx| + |qm_xy|) * POSITION_PRECISION * z0,
// y_lim = |m_yx| * dx + |m_yy| * dy
// ~= |qm_yx| * q_x * dx + |qm_yy| * q_y * dy
// = (|qm_yx| + |qm_yy|) * POSITION_PRECISION * z0,
// max(x_lim, y_lim) / z0 ~= w
// = max(|qm_xx| + |qm_xy|, |qm_yx| + |qm_yy|) * POSITION_PRECISION.
// Quantization steps (ACCURACY ~ 2 * POSITION_PRECISION):
// D(m_zx) ~ POSITION_PRECISION * z0^2 / max(x_lim, y_lim) / dx ~= q_zx = q_x / w,
// D(m_zy) ~ POSITION_PRECISION * z0^2 / max(x_lim, y_lim) / dy ~= q_zy = q_y / w,
// qm_zx = round(m_zx / q_zx), qm_zy = round(m_zy / q_zy).
int32_t qmx = abs(qm[0][0]) + abs(qm[0][1]);
int32_t qmy = abs(qm[1][0]) + abs(qm[1][1]);
w = POSITION_PRECISION * FFMAX(qmx, qmy);
mul[0] *= w;
mul[1] *= w;
for (int j = 0; j < 2; j++) {
double val = m[2][j] * mul[j];
if (!(fabs(val) < max_val))
return false;
qm[2][j] = lrint(val);
}
if (first && offset) {
offset->x = center[0] - qr[0];
offset->y = center[1] - qr[1];
}
pos->x = qr[0] >> SUBPIXEL_ORDER;
pos->y = qr[1] >> SUBPIXEL_ORDER;
key->offset.x = qr[0] & ((1 << SUBPIXEL_ORDER) - 1);
key->offset.y = qr[1] & ((1 << SUBPIXEL_ORDER) - 1);
key->matrix_x.x = qm[0][0]; key->matrix_x.y = qm[0][1];
key->matrix_y.x = qm[1][0]; key->matrix_y.y = qm[1][1];
key->matrix_z.x = qm[2][0]; key->matrix_z.y = qm[2][1];
return true;
}
static void restore_transform(double m[3][3], const BitmapHashKey *key)
{
const ASS_Rect *bbox = &key->outline->cbox;
double x0 = (bbox->x_min + bbox->x_max) / 2.0;
double y0 = (bbox->y_min + bbox->y_max) / 2.0;
double dx = (bbox->x_max - bbox->x_min) / 2.0 + 64;
double dy = (bbox->y_max - bbox->y_min) / 2.0 + 64;
// Arbitrary scale has chosen so that z0 = 1
double q_x = POSITION_PRECISION / dx;
double q_y = POSITION_PRECISION / dy;
m[0][0] = key->matrix_x.x * q_x;
m[0][1] = key->matrix_x.y * q_y;
m[1][0] = key->matrix_y.x * q_x;
m[1][1] = key->matrix_y.y * q_y;
int32_t qmx = abs(key->matrix_x.x) + abs(key->matrix_x.y);
int32_t qmy = abs(key->matrix_y.x) + abs(key->matrix_y.y);
double scale_z = 1.0 / POSITION_PRECISION / FFMAX(qmx, qmy);
m[2][0] = key->matrix_z.x * q_x * scale_z; // qm_zx * q_zx
m[2][1] = key->matrix_z.y * q_y * scale_z; // qm_zy * q_zy
m[0][2] = m[1][2] = 0;
m[2][2] = 1 + fabs(m[2][0]) * dx + fabs(m[2][1]) * dy;
m[2][2] = FFMIN(m[2][2], MAX_PERSP_SCALE);
double center[2] = {
key->offset.x * (64 >> SUBPIXEL_ORDER),
key->offset.y * (64 >> SUBPIXEL_ORDER),
};
for (int i = 0; i < 2; i++)
for (int j = 0; j < 3; j++)
m[i][j] += m[2][j] * center[i];
for (int i = 0; i < 3; i++)
m[i][2] -= m[i][0] * x0 + m[i][1] * y0;
}
// Calculate bitmap memory footprint
static inline size_t bitmap_size(const Bitmap *bm)
{
return bm->stride * bm->h;
}
/**
* Iterate through a list of bitmaps and blend with clip vector, if
* applicable. The blended bitmaps are added to a free list which is freed
* at the start of a new frame.
*/
static void blend_vector_clip(ASS_Renderer *render_priv, ASS_Image *head)
{
if (!render_priv->state.clip_drawing_text)
return;
OutlineHashKey ol_key;
ol_key.type = OUTLINE_DRAWING;
ol_key.u.drawing.text = render_priv->state.clip_drawing_text;
double m[3][3] = {{0}};
double w = render_priv->font_scale / (1 << (render_priv->state.clip_drawing_scale - 1));
m[0][0] = render_priv->font_scale_x * w;
m[1][1] = w;
m[2][2] = 1;
m[0][2] = int_to_d6(render_priv->settings.left_margin);
m[1][2] = int_to_d6(render_priv->settings.top_margin);
ASS_Vector pos;
BitmapHashKey key;
key.outline = ass_cache_get(render_priv->cache.outline_cache, &ol_key, render_priv);
if (!key.outline || !key.outline->valid ||
!quantize_transform(m, &pos, NULL, true, &key)) {
ass_cache_dec_ref(key.outline);
return;
}
Bitmap *clip_bm = ass_cache_get(render_priv->cache.bitmap_cache, &key, render_priv);
if (!clip_bm || !clip_bm->buffer) {
ass_cache_dec_ref(clip_bm);
return;
}
// Iterate through bitmaps and blend/clip them
for (ASS_Image *cur = head; cur; cur = cur->next) {
int left, top, right, bottom, w, h;
int ax, ay, aw, ah, as;
int bx, by, bw, bh, bs;
int aleft, atop, bleft, btop;
unsigned char *abuffer, *bbuffer, *nbuffer;
abuffer = cur->bitmap;
bbuffer = clip_bm->buffer;
ax = cur->dst_x;
ay = cur->dst_y;
aw = cur->w;
ah = cur->h;
as = cur->stride;
bx = pos.x + clip_bm->left;
by = pos.y + clip_bm->top;
bw = clip_bm->w;
bh = clip_bm->h;
bs = clip_bm->stride;
// Calculate overlap coordinates
left = (ax > bx) ? ax : bx;
top = (ay > by) ? ay : by;
right = ((ax + aw) < (bx + bw)) ? (ax + aw) : (bx + bw);
bottom = ((ay + ah) < (by + bh)) ? (ay + ah) : (by + bh);
aleft = left - ax;
atop = top - ay;
w = right - left;
h = bottom - top;
bleft = left - bx;
btop = top - by;
if (render_priv->state.clip_drawing_mode) {
// Inverse clip
if (ax + aw < bx || ay + ah < by || ax > bx + bw ||
ay > by + bh || !h || !w) {
continue;
}
// Allocate new buffer and add to free list
nbuffer = ass_aligned_alloc(32, as * ah, false);
if (!nbuffer)
break;
// Blend together
memcpy(nbuffer, abuffer, ((ah - 1) * as) + aw);
render_priv->engine->sub_bitmaps(nbuffer + atop * as + aleft, as,
bbuffer + btop * bs + bleft, bs,
h, w);
} else {
// Regular clip
if (ax + aw < bx || ay + ah < by || ax > bx + bw ||
ay > by + bh || !h || !w) {
cur->w = cur->h = cur->stride = 0;
continue;
}
// Allocate new buffer and add to free list
unsigned align = (w >= 16) ? 16 : ((w >= 8) ? 8 : 1);
unsigned ns = ass_align(align, w);
nbuffer = ass_aligned_alloc(align, ns * h, false);
if (!nbuffer)
break;
// Blend together
render_priv->engine->mul_bitmaps(nbuffer, ns,
abuffer + atop * as + aleft, as,
bbuffer + btop * bs + bleft, bs,
w, h);
cur->dst_x += aleft;
cur->dst_y += atop;
cur->w = w;
cur->h = h;
cur->stride = ns;
}
ASS_ImagePriv *priv = (ASS_ImagePriv *) cur;
priv->buffer = cur->bitmap = nbuffer;
ass_cache_dec_ref(priv->source);
priv->source = NULL;
}
ass_cache_dec_ref(clip_bm);
}
/**
* \brief Convert TextInfo struct to ASS_Image list
* Splits glyphs in halves when needed (for \kf karaoke).
*/
static ASS_Image *render_text(ASS_Renderer *render_priv)
{
ASS_Image *head;
ASS_Image **tail = &head;
unsigned n_bitmaps = render_priv->text_info.n_bitmaps;
CombinedBitmapInfo *bitmaps = render_priv->text_info.combined_bitmaps;
for (unsigned i = 0; i < n_bitmaps; i++) {
CombinedBitmapInfo *info = &bitmaps[i];
if (!info->bm_s || render_priv->state.border_style == 4)
continue;
tail =
render_glyph(render_priv, info->bm_s, info->x, info->y, info->c[3], 0,
1000000, tail, IMAGE_TYPE_SHADOW, info->image);
}
for (unsigned i = 0; i < n_bitmaps; i++) {
CombinedBitmapInfo *info = &bitmaps[i];
if (!info->bm_o)
continue;
if ((info->effect_type == EF_KARAOKE_KO)
&& (info->effect_timing <= info->first_pos_x)) {
// do nothing
} else {
tail =
render_glyph(render_priv, info->bm_o, info->x, info->y, info->c[2],
0, 1000000, tail, IMAGE_TYPE_OUTLINE, info->image);
}
}
for (unsigned i = 0; i < n_bitmaps; i++) {
CombinedBitmapInfo *info = &bitmaps[i];
if (!info->bm)
continue;
if ((info->effect_type == EF_KARAOKE)
|| (info->effect_type == EF_KARAOKE_KO)) {
if (info->effect_timing > info->first_pos_x)
tail =
render_glyph(render_priv, info->bm, info->x, info->y,
info->c[0], 0, 1000000, tail,
IMAGE_TYPE_CHARACTER, info->image);
else
tail =
render_glyph(render_priv, info->bm, info->x, info->y,
info->c[1], 0, 1000000, tail,
IMAGE_TYPE_CHARACTER, info->image);
} else if (info->effect_type == EF_KARAOKE_KF) {
tail =
render_glyph(render_priv, info->bm, info->x, info->y, info->c[0],
info->c[1], info->effect_timing, tail,
IMAGE_TYPE_CHARACTER, info->image);
} else
tail =
render_glyph(render_priv, info->bm, info->x, info->y, info->c[0],
0, 1000000, tail, IMAGE_TYPE_CHARACTER, info->image);
}
for (unsigned i = 0; i < n_bitmaps; i++)
ass_cache_dec_ref(bitmaps[i].image);
*tail = 0;
blend_vector_clip(render_priv, head);
return head;
}
static void compute_string_bbox(TextInfo *text, ASS_DRect *bbox)
{
if (text->length > 0) {
bbox->x_min = +32000;
bbox->x_max = -32000;
bbox->y_min = d6_to_double(text->glyphs[0].pos.y) - text->lines[0].asc;
bbox->y_max = bbox->y_min + text->height;
for (int i = 0; i < text->length; i++) {
GlyphInfo *info = text->glyphs + i;
if (info->skip) continue;
double s = d6_to_double(info->pos.x);
double e = s + d6_to_double(info->cluster_advance.x);
bbox->x_min = FFMIN(bbox->x_min, s);
bbox->x_max = FFMAX(bbox->x_max, e);
}
} else
bbox->x_min = bbox->x_max = bbox->y_min = bbox->y_max = 0;
}
static ASS_Style *handle_selective_style_overrides(ASS_Renderer *render_priv,
ASS_Style *rstyle)
{
// The script style is the one the event was declared with.
ASS_Style *script = render_priv->track->styles +
render_priv->state.event->Style;
// The user style was set with ass_set_selective_style_override().
ASS_Style *user = &render_priv->user_override_style;
ASS_Style *new = &render_priv->state.override_style_temp_storage;
int explicit = render_priv->state.explicit;
int requested = render_priv->settings.selective_style_overrides;
double scale;
user->Name = "OverrideStyle"; // name insignificant
// Either the event's style, or the style forced with a \r tag.
if (!rstyle)
rstyle = script;
// Create a new style that contains a mix of the original style and
// user_style (the user's override style). Copy only fields from the
// script's style that are deemed necessary.
*new = *rstyle;
render_priv->state.apply_font_scale =
!explicit || !(requested & ASS_OVERRIDE_BIT_SELECTIVE_FONT_SCALE);
// On positioned events, do not apply most overrides.
if (explicit)
requested = 0;
if (requested & ASS_OVERRIDE_BIT_STYLE)
requested |= ASS_OVERRIDE_BIT_FONT_NAME |
ASS_OVERRIDE_BIT_FONT_SIZE_FIELDS |
ASS_OVERRIDE_BIT_COLORS |
ASS_OVERRIDE_BIT_BORDER |
ASS_OVERRIDE_BIT_ATTRIBUTES;
// Copies fields even not covered by any of the other bits.
if (requested & ASS_OVERRIDE_FULL_STYLE)
*new = *user;
// The user style is supposed to be independent of the script resolution.
// Treat the user style's values as if they were specified for a script with
// PlayResY=288, and rescale the values to the current script.
scale = render_priv->track->PlayResY / 288.0;
if (requested & ASS_OVERRIDE_BIT_FONT_SIZE_FIELDS) {
new->FontSize = user->FontSize * scale;
new->Spacing = user->Spacing * scale;
new->ScaleX = user->ScaleX;
new->ScaleY = user->ScaleY;
}
if (requested & ASS_OVERRIDE_BIT_FONT_NAME) {
new->FontName = user->FontName;
new->treat_fontname_as_pattern = user->treat_fontname_as_pattern;
}
if (requested & ASS_OVERRIDE_BIT_COLORS) {
new->PrimaryColour = user->PrimaryColour;
new->SecondaryColour = user->SecondaryColour;
new->OutlineColour = user->OutlineColour;
new->BackColour = user->BackColour;
}
if (requested & ASS_OVERRIDE_BIT_ATTRIBUTES) {
new->Bold = user->Bold;
new->Italic = user->Italic;
new->Underline = user->Underline;
new->StrikeOut = user->StrikeOut;
}
if (requested & ASS_OVERRIDE_BIT_BORDER) {
new->BorderStyle = user->BorderStyle;
new->Outline = user->Outline * scale;
new->Shadow = user->Shadow * scale;
}
if (requested & ASS_OVERRIDE_BIT_ALIGNMENT)
new->Alignment = user->Alignment;
if (requested & ASS_OVERRIDE_BIT_JUSTIFY)
new->Justify = user->Justify;
if (requested & ASS_OVERRIDE_BIT_MARGINS) {
new->MarginL = user->MarginL;
new->MarginR = user->MarginR;
new->MarginV = user->MarginV;
}
if (!new->FontName)
new->FontName = rstyle->FontName;
render_priv->state.style = new;
render_priv->state.overrides = requested;
return new;
}
static void init_font_scale(ASS_Renderer *render_priv)
{
ASS_Settings *settings_priv = &render_priv->settings;
double font_scr_h = render_priv->orig_height;
if (!render_priv->state.explicit && render_priv->settings.use_margins)
font_scr_h = render_priv->fit_height;
render_priv->font_scale = font_scr_h / render_priv->track->PlayResY;
if (settings_priv->storage_height)
render_priv->blur_scale = font_scr_h / settings_priv->storage_height;
else
render_priv->blur_scale = 1.;
if (render_priv->track->ScaledBorderAndShadow)
render_priv->border_scale =
font_scr_h / render_priv->track->PlayResY;
else
render_priv->border_scale = render_priv->blur_scale;
if (!settings_priv->storage_height)
render_priv->blur_scale = render_priv->border_scale;
if (render_priv->state.apply_font_scale) {
render_priv->font_scale *= settings_priv->font_size_coeff;
render_priv->border_scale *= settings_priv->font_size_coeff;
render_priv->blur_scale *= settings_priv->font_size_coeff;
}
}