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// SPDX-License-Identifier: MPL-2.0+
use sentryshot_util::{
ceil_rshift,
pixfmt::{
PixelFormat, PIX_FMT_FLAG_ALPHA, PIX_FMT_FLAG_BE, PIX_FMT_FLAG_PLANAR, PIX_FMT_FLAG_RGB,
},
};
use thiserror::Error;
pub(crate) struct DrawContext {
//const struct AVPixFmtDescriptor *desc;
//enum AVPixelFormat format;
nb_planes: u8,
// Offset between pixels.
pub pixelstep: [usize; MAX_PLANES2],
// Horizontal subsampling.
pub hsub: [u8; 4],
// Vertical subsampling.
pub vsub: [u8; 4],
//
//uint8_t hsub_max;
//uint8_t vsub_max;
//enum AVColorRange range;
//unsigned flags;
//enum AVColorSpace csp;
//double rgb2yuv[3][3];
}
const MAX_PLANES: u8 = 4;
const MAX_PLANES2: usize = 4;
#[derive(Debug, Error, PartialEq, Eq)]
pub enum NewDrawContextError {
#[error("big endian pixel formats are unsupported")]
BigEndianUnsupported,
#[error("pixel format {0} is unsupported")]
PixelFormatUnsupported(PixelFormat),
#[error("bit depth {0} is unsupported")]
BitDepthUnsupported(u8),
#[error("too many planes")]
TooManyPlanes,
#[error("middle bits")]
MiddleBits,
#[error("mixed depths")]
MixedDepths,
#[error("strange interleaving")]
StrangeInterleaving,
}
impl DrawContext {
pub fn new(pix_fmt: PixelFormat) -> Result<Self, NewDrawContextError> {
use NewDrawContextError::*;
if pix_fmt.flags() & PIX_FMT_FLAG_BE != 0 {
return Err(BigEndianUnsupported);
}
if pix_fmt.flags() & !(PIX_FMT_FLAG_PLANAR | PIX_FMT_FLAG_RGB | PIX_FMT_FLAG_ALPHA) != 0 {
return Err(PixelFormatUnsupported(pix_fmt));
}
/*if (csp == AVCOL_SPC_UNSPECIFIED)
csp = (desc->flags & AV_PIX_FMT_FLAG_RGB) ? AVCOL_SPC_RGB : AVCOL_SPC_SMPTE170M;
if (!(desc->flags & AV_PIX_FMT_FLAG_RGB) && !(luma = av_csp_luma_coeffs_from_avcsp(csp)))
return AVERROR(EINVAL);
if (range == AVCOL_RANGE_UNSPECIFIED)
range = (format == AV_PIX_FMT_YUVJ420P || format == AV_PIX_FMT_YUVJ422P ||
format == AV_PIX_FMT_YUVJ444P || format == AV_PIX_FMT_YUVJ411P ||
format == AV_PIX_FMT_YUVJ440P || csp == AVCOL_SPC_RGB)
? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
if (range != AVCOL_RANGE_JPEG && range != AVCOL_RANGE_MPEG)
return AVERROR(EINVAL);*/
let mut depthb = 0;
let mut pixelstep: [usize; MAX_PLANES2] = [0, 0, 0, 0];
let mut nb_planes = 0;
for i in 0..pix_fmt.comps().len() {
let c = &pix_fmt.comps()[i];
// For now, only 8-16 bits formats.
if c.depth() < 8 || c.depth() > 16 {
return Err(BitDepthUnsupported(c.depth()));
}
if c.plane() >= MAX_PLANES {
return Err(TooManyPlanes);
}
// data must either be in the high or low bits, never middle.
if c.shift() != 0 && ((c.shift() + c.depth()) & 0b111) != 0 {
return Err(MiddleBits);
}
// Mixed >8 and <=8 depth.
let db = (c.depth() + 7) / 8;
if depthb != 0 && (depthb != db) {
return Err(MixedDepths);
}
depthb = db;
if db * (c.offset() + 1) > 16 {
return Err(MixedDepths);
}
if (c.offset() % db) != 0 {
return Err(MixedDepths);
}
// Strange interleaving.
let plane = usize::from(c.plane());
let step = usize::from(c.step());
if pixelstep[plane] != 0 && pixelstep[plane] != step {
return Err(StrangeInterleaving);
}
pixelstep[plane] = step;
if pixelstep[plane] >= 8 {
return Err(StrangeInterleaving);
}
nb_planes = nb_planes.max(c.plane() + 1);
}
//draw->format = format;
//draw->range = range;
//draw->csp = csp;
//draw->flags = flags;
//if (luma)
// ff_fill_rgb2yuv_table(luma, draw->rgb2yuv);
let log2_chroma_w = pix_fmt.log2_chroma_w();
//draw->hsub[1] = draw->hsub[2] = draw->hsub_max = desc->log2_chroma_w;
let log2_chroma_h = pix_fmt.log2_chroma_h();
//draw->vsub[1] = draw->vsub[2] = draw->vsub_max = desc->log2_chroma_h;
Ok(DrawContext {
nb_planes,
pixelstep,
hsub: [0, log2_chroma_w, log2_chroma_w, 0],
vsub: [0, log2_chroma_h, log2_chroma_h, 0],
})
}
//ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color,
// uint8_t *dst[], int dst_linesize[],
// int dst_x, int dst_y, int w, int h)
//fn ff_fill_rectangle(&self) {
//int plane, x, y, wp, hp;
//uint8_t *p0, *p;
//FFDrawColor color_tmp = *color;
/*for (plane = 0; plane < draw->nb_planes; plane++) {
p0 = pointer_at(draw, dst, dst_linesize, plane, dst_x, dst_y);
wp = AV_CEIL_RSHIFT(w, draw->hsub[plane]);
hp = AV_CEIL_RSHIFT(h, draw->vsub[plane]);
if (!hp)
return;
p = p0;
if (HAVE_BIGENDIAN && draw->desc->comp[0].depth > 8) {
for (x = 0; 2*x < draw->pixelstep[plane]; x++)
color_tmp.comp[plane].u16[x] = av_bswap16(color_tmp.comp[plane].u16[x]);
}
/* copy first line from color */
for (x = 0; x < wp; x++) {
memcpy(p, color_tmp.comp[plane].u8, draw->pixelstep[plane]);
p += draw->pixelstep[plane];
}
wp *= draw->pixelstep[plane];
/* copy next lines from first line */
p = p0 + dst_linesize[plane];
for (y = 1; y < hp; y++) {
memcpy(p, p0, wp);
p += dst_linesize[plane];
}
}*/
//}
#[allow(clippy::similar_names)]
fn slice_offset(&self, linesize: &[usize], plane: usize, x: u16, y: u16) -> usize {
let y = usize::from(y);
let x = usize::from(x);
let vsub = usize::from(self.vsub[plane]);
let hsub = usize::from(self.hsub[plane]);
(y >> vsub) * linesize[plane] + (x >> hsub) * self.pixelstep[plane]
}
fn slice_at<'a>(
&self,
data: &'a [Vec<u8>],
linesize: &[usize],
plane: u8,
x: u16,
y: u16,
) -> &'a [u8] {
let plane = usize::from(plane);
let offset = self.slice_offset(linesize, plane, x, y);
&data[plane][offset..]
}
fn slice_at_mut<'a>(
&self,
data: &'a mut [Vec<u8>],
linesize: &[usize],
plane: u8,
x: u16,
y: u16,
) -> &'a mut [u8] {
let plane = usize::from(plane);
let offset = self.slice_offset(linesize, plane, x, y);
&mut data[plane][offset..]
}
#[allow(clippy::too_many_arguments)]
pub(crate) fn copy_rectangle(
&self,
dst: &mut [Vec<u8>],
dst_linesize: &[usize],
src: &[Vec<u8>],
src_linesize: &[usize],
dst_x: u16,
dst_y: u16,
src_x: u16,
src_y: u16,
w: u16,
h: u16,
) {
for plane in 0..self.nb_planes {
let mut p = self.slice_at(src, src_linesize, plane, src_x, src_y);
let mut q = self.slice_at_mut(dst, dst_linesize, plane, dst_x, dst_y);
let plane = usize::from(plane);
let wp = usize::from(ceil_rshift(w, self.hsub[plane])) * self.pixelstep[plane];
let hp = ceil_rshift(h, self.vsub[plane]);
// Don't advance pointers on last iteration.
for _ in 0..hp - 1 {
q[..wp].copy_from_slice(&p[..wp]);
p = &p[src_linesize[plane]..];
q = &mut q[dst_linesize[plane]..];
}
q[..wp].copy_from_slice(&p[..wp]);
}
}
}