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pixconv-submodule.c
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pixconv-submodule.c
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// Copyright 2017 The Wuffs Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ---------------- Pixel Swizzler
static inline uint32_t //
wuffs_base__swap_u32_argb_abgr(uint32_t u) {
uint32_t o = u & 0xFF00FF00ul;
uint32_t r = u & 0x00FF0000ul;
uint32_t b = u & 0x000000FFul;
return o | (r >> 16) | (b << 16);
}
static inline uint64_t //
wuffs_base__swap_u64_argb_abgr(uint64_t u) {
uint64_t o = u & 0xFFFF0000FFFF0000ull;
uint64_t r = u & 0x0000FFFF00000000ull;
uint64_t b = u & 0x000000000000FFFFull;
return o | (r >> 32) | (b << 32);
}
static inline uint32_t //
wuffs_base__color_u64__as__color_u32__swap_u32_argb_abgr(uint64_t c) {
uint32_t a = ((uint32_t)(0xFF & (c >> 56)));
uint32_t r = ((uint32_t)(0xFF & (c >> 40)));
uint32_t g = ((uint32_t)(0xFF & (c >> 24)));
uint32_t b = ((uint32_t)(0xFF & (c >> 8)));
return (a << 24) | (b << 16) | (g << 8) | (r << 0);
}
// --------
WUFFS_BASE__MAYBE_STATIC wuffs_base__color_u32_argb_premul //
wuffs_base__pixel_buffer__color_u32_at(const wuffs_base__pixel_buffer* pb,
uint32_t x,
uint32_t y) {
if (!pb || (x >= pb->pixcfg.private_impl.width) ||
(y >= pb->pixcfg.private_impl.height)) {
return 0;
}
if (wuffs_base__pixel_format__is_planar(&pb->pixcfg.private_impl.pixfmt)) {
// TODO: support planar formats.
return 0;
}
size_t stride = pb->private_impl.planes[0].stride;
const uint8_t* row = pb->private_impl.planes[0].ptr + (stride * ((size_t)y));
switch (pb->pixcfg.private_impl.pixfmt.repr) {
case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
return wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x)));
case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY: {
uint8_t* palette = pb->private_impl.planes[3].ptr;
return wuffs_base__peek_u32le__no_bounds_check(palette +
(4 * ((size_t)row[x])));
}
// Common formats above. Rarer formats below.
case WUFFS_BASE__PIXEL_FORMAT__Y:
return 0xFF000000 | (0x00010101 * ((uint32_t)(row[x])));
case WUFFS_BASE__PIXEL_FORMAT__Y_16LE:
return 0xFF000000 | (0x00010101 * ((uint32_t)(row[(2 * x) + 1])));
case WUFFS_BASE__PIXEL_FORMAT__Y_16BE:
return 0xFF000000 | (0x00010101 * ((uint32_t)(row[(2 * x) + 0])));
case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL: {
uint8_t* palette = pb->private_impl.planes[3].ptr;
return wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
wuffs_base__peek_u32le__no_bounds_check(palette +
(4 * ((size_t)row[x]))));
}
case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
return wuffs_base__color_u16_rgb_565__as__color_u32_argb_premul(
wuffs_base__peek_u16le__no_bounds_check(row + (2 * ((size_t)x))));
case WUFFS_BASE__PIXEL_FORMAT__BGR:
return 0xFF000000 |
wuffs_base__peek_u24le__no_bounds_check(row + (3 * ((size_t)x)));
case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
return wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x))));
case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
return wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(
wuffs_base__peek_u64le__no_bounds_check(row + (8 * ((size_t)x))));
case WUFFS_BASE__PIXEL_FORMAT__BGRX:
return 0xFF000000 |
wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x)));
case WUFFS_BASE__PIXEL_FORMAT__RGB:
return wuffs_base__swap_u32_argb_abgr(
0xFF000000 |
wuffs_base__peek_u24le__no_bounds_check(row + (3 * ((size_t)x))));
case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
return wuffs_base__swap_u32_argb_abgr(
wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
wuffs_base__peek_u32le__no_bounds_check(row +
(4 * ((size_t)x)))));
case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
return wuffs_base__swap_u32_argb_abgr(
wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x))));
case WUFFS_BASE__PIXEL_FORMAT__RGBX:
return wuffs_base__swap_u32_argb_abgr(
0xFF000000 |
wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x))));
default:
// TODO: support more formats.
break;
}
return 0;
}
// --------
WUFFS_BASE__MAYBE_STATIC wuffs_base__status //
wuffs_base__pixel_buffer__set_color_u32_at(
wuffs_base__pixel_buffer* pb,
uint32_t x,
uint32_t y,
wuffs_base__color_u32_argb_premul color) {
if (!pb) {
return wuffs_base__make_status(wuffs_base__error__bad_receiver);
}
if ((x >= pb->pixcfg.private_impl.width) ||
(y >= pb->pixcfg.private_impl.height)) {
return wuffs_base__make_status(wuffs_base__error__bad_argument);
}
if (wuffs_base__pixel_format__is_planar(&pb->pixcfg.private_impl.pixfmt)) {
// TODO: support planar formats.
return wuffs_base__make_status(wuffs_base__error__unsupported_option);
}
size_t stride = pb->private_impl.planes[0].stride;
uint8_t* row = pb->private_impl.planes[0].ptr + (stride * ((size_t)y));
switch (pb->pixcfg.private_impl.pixfmt.repr) {
case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
case WUFFS_BASE__PIXEL_FORMAT__BGRX:
wuffs_base__poke_u32le__no_bounds_check(row + (4 * ((size_t)x)), color);
break;
// Common formats above. Rarer formats below.
case WUFFS_BASE__PIXEL_FORMAT__Y:
wuffs_base__poke_u8__no_bounds_check(
row + ((size_t)x),
wuffs_base__color_u32_argb_premul__as__color_u8_gray(color));
break;
case WUFFS_BASE__PIXEL_FORMAT__Y_16LE:
wuffs_base__poke_u16le__no_bounds_check(
row + (2 * ((size_t)x)),
wuffs_base__color_u32_argb_premul__as__color_u16_gray(color));
break;
case WUFFS_BASE__PIXEL_FORMAT__Y_16BE:
wuffs_base__poke_u16be__no_bounds_check(
row + (2 * ((size_t)x)),
wuffs_base__color_u32_argb_premul__as__color_u16_gray(color));
break;
case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
wuffs_base__poke_u8__no_bounds_check(
row + ((size_t)x), wuffs_base__pixel_palette__closest_element(
wuffs_base__pixel_buffer__palette(pb),
pb->pixcfg.private_impl.pixfmt, color));
break;
case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
wuffs_base__poke_u16le__no_bounds_check(
row + (2 * ((size_t)x)),
wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(color));
break;
case WUFFS_BASE__PIXEL_FORMAT__BGR:
wuffs_base__poke_u24le__no_bounds_check(row + (3 * ((size_t)x)), color);
break;
case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
wuffs_base__poke_u32le__no_bounds_check(
row + (4 * ((size_t)x)),
wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
color));
break;
case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
wuffs_base__poke_u64le__no_bounds_check(
row + (8 * ((size_t)x)),
wuffs_base__color_u32_argb_premul__as__color_u64_argb_nonpremul(
color));
break;
case WUFFS_BASE__PIXEL_FORMAT__RGB:
wuffs_base__poke_u24le__no_bounds_check(
row + (3 * ((size_t)x)), wuffs_base__swap_u32_argb_abgr(color));
break;
case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
wuffs_base__poke_u32le__no_bounds_check(
row + (4 * ((size_t)x)),
wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
wuffs_base__swap_u32_argb_abgr(color)));
break;
case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
case WUFFS_BASE__PIXEL_FORMAT__RGBX:
wuffs_base__poke_u32le__no_bounds_check(
row + (4 * ((size_t)x)), wuffs_base__swap_u32_argb_abgr(color));
break;
default:
// TODO: support more formats.
return wuffs_base__make_status(wuffs_base__error__unsupported_option);
}
return wuffs_base__make_status(NULL);
}
// --------
static inline void //
wuffs_base__pixel_buffer__set_color_u32_fill_rect__xx(
wuffs_base__pixel_buffer* pb,
wuffs_base__rect_ie_u32 rect,
uint16_t color) {
size_t stride = pb->private_impl.planes[0].stride;
uint32_t width = wuffs_base__rect_ie_u32__width(&rect);
if ((stride == (2 * ((uint64_t)width))) && (rect.min_incl_x == 0)) {
uint8_t* ptr =
pb->private_impl.planes[0].ptr + (stride * ((size_t)rect.min_incl_y));
uint32_t height = wuffs_base__rect_ie_u32__height(&rect);
size_t n;
for (n = ((size_t)width) * ((size_t)height); n > 0; n--) {
wuffs_base__poke_u16le__no_bounds_check(ptr, color);
ptr += 2;
}
return;
}
uint32_t y;
for (y = rect.min_incl_y; y < rect.max_excl_y; y++) {
uint8_t* ptr = pb->private_impl.planes[0].ptr + (stride * ((size_t)y)) +
(2 * ((size_t)rect.min_incl_x));
uint32_t n;
for (n = width; n > 0; n--) {
wuffs_base__poke_u16le__no_bounds_check(ptr, color);
ptr += 2;
}
}
}
static inline void //
wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxx(
wuffs_base__pixel_buffer* pb,
wuffs_base__rect_ie_u32 rect,
uint32_t color) {
size_t stride = pb->private_impl.planes[0].stride;
uint32_t width = wuffs_base__rect_ie_u32__width(&rect);
if ((stride == (3 * ((uint64_t)width))) && (rect.min_incl_x == 0)) {
uint8_t* ptr =
pb->private_impl.planes[0].ptr + (stride * ((size_t)rect.min_incl_y));
uint32_t height = wuffs_base__rect_ie_u32__height(&rect);
size_t n;
for (n = ((size_t)width) * ((size_t)height); n > 0; n--) {
wuffs_base__poke_u24le__no_bounds_check(ptr, color);
ptr += 3;
}
return;
}
uint32_t y;
for (y = rect.min_incl_y; y < rect.max_excl_y; y++) {
uint8_t* ptr = pb->private_impl.planes[0].ptr + (stride * ((size_t)y)) +
(3 * ((size_t)rect.min_incl_x));
uint32_t n;
for (n = width; n > 0; n--) {
wuffs_base__poke_u24le__no_bounds_check(ptr, color);
ptr += 3;
}
}
}
static inline void //
wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxx(
wuffs_base__pixel_buffer* pb,
wuffs_base__rect_ie_u32 rect,
uint32_t color) {
size_t stride = pb->private_impl.planes[0].stride;
uint32_t width = wuffs_base__rect_ie_u32__width(&rect);
if ((stride == (4 * ((uint64_t)width))) && (rect.min_incl_x == 0)) {
uint8_t* ptr =
pb->private_impl.planes[0].ptr + (stride * ((size_t)rect.min_incl_y));
uint32_t height = wuffs_base__rect_ie_u32__height(&rect);
size_t n;
for (n = ((size_t)width) * ((size_t)height); n > 0; n--) {
wuffs_base__poke_u32le__no_bounds_check(ptr, color);
ptr += 4;
}
return;
}
uint32_t y;
for (y = rect.min_incl_y; y < rect.max_excl_y; y++) {
uint8_t* ptr = pb->private_impl.planes[0].ptr + (stride * ((size_t)y)) +
(4 * ((size_t)rect.min_incl_x));
uint32_t n;
for (n = width; n > 0; n--) {
wuffs_base__poke_u32le__no_bounds_check(ptr, color);
ptr += 4;
}
}
}
static inline void //
wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxxxxxx(
wuffs_base__pixel_buffer* pb,
wuffs_base__rect_ie_u32 rect,
uint64_t color) {
size_t stride = pb->private_impl.planes[0].stride;
uint32_t width = wuffs_base__rect_ie_u32__width(&rect);
if ((stride == (8 * ((uint64_t)width))) && (rect.min_incl_x == 0)) {
uint8_t* ptr =
pb->private_impl.planes[0].ptr + (stride * ((size_t)rect.min_incl_y));
uint32_t height = wuffs_base__rect_ie_u32__height(&rect);
size_t n;
for (n = ((size_t)width) * ((size_t)height); n > 0; n--) {
wuffs_base__poke_u64le__no_bounds_check(ptr, color);
ptr += 8;
}
return;
}
uint32_t y;
for (y = rect.min_incl_y; y < rect.max_excl_y; y++) {
uint8_t* ptr = pb->private_impl.planes[0].ptr + (stride * ((size_t)y)) +
(8 * ((size_t)rect.min_incl_x));
uint32_t n;
for (n = width; n > 0; n--) {
wuffs_base__poke_u64le__no_bounds_check(ptr, color);
ptr += 8;
}
}
}
WUFFS_BASE__MAYBE_STATIC wuffs_base__status //
wuffs_base__pixel_buffer__set_color_u32_fill_rect(
wuffs_base__pixel_buffer* pb,
wuffs_base__rect_ie_u32 rect,
wuffs_base__color_u32_argb_premul color) {
if (!pb) {
return wuffs_base__make_status(wuffs_base__error__bad_receiver);
} else if (wuffs_base__rect_ie_u32__is_empty(&rect)) {
return wuffs_base__make_status(NULL);
}
wuffs_base__rect_ie_u32 bounds =
wuffs_base__pixel_config__bounds(&pb->pixcfg);
if (!wuffs_base__rect_ie_u32__contains_rect(&bounds, rect)) {
return wuffs_base__make_status(wuffs_base__error__bad_argument);
}
if (wuffs_base__pixel_format__is_planar(&pb->pixcfg.private_impl.pixfmt)) {
// TODO: support planar formats.
return wuffs_base__make_status(wuffs_base__error__unsupported_option);
}
switch (pb->pixcfg.private_impl.pixfmt.repr) {
case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
case WUFFS_BASE__PIXEL_FORMAT__BGRX:
wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxx(pb, rect, color);
return wuffs_base__make_status(NULL);
// Common formats above. Rarer formats below.
case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
wuffs_base__pixel_buffer__set_color_u32_fill_rect__xx(
pb, rect,
wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(color));
return wuffs_base__make_status(NULL);
case WUFFS_BASE__PIXEL_FORMAT__BGR:
wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxx(pb, rect, color);
return wuffs_base__make_status(NULL);
case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxx(
pb, rect,
wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
color));
return wuffs_base__make_status(NULL);
case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxxxxxx(
pb, rect,
wuffs_base__color_u32_argb_premul__as__color_u64_argb_nonpremul(
color));
return wuffs_base__make_status(NULL);
case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxx(
pb, rect,
wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
wuffs_base__swap_u32_argb_abgr(color)));
return wuffs_base__make_status(NULL);
case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
case WUFFS_BASE__PIXEL_FORMAT__RGBX:
wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxx(
pb, rect, wuffs_base__swap_u32_argb_abgr(color));
return wuffs_base__make_status(NULL);
}
uint32_t y;
for (y = rect.min_incl_y; y < rect.max_excl_y; y++) {
uint32_t x;
for (x = rect.min_incl_x; x < rect.max_excl_x; x++) {
wuffs_base__pixel_buffer__set_color_u32_at(pb, x, y, color);
}
}
return wuffs_base__make_status(NULL);
}
// --------
WUFFS_BASE__MAYBE_STATIC uint8_t //
wuffs_base__pixel_palette__closest_element(
wuffs_base__slice_u8 palette_slice,
wuffs_base__pixel_format palette_format,
wuffs_base__color_u32_argb_premul c) {
size_t n = palette_slice.len / 4;
if (n > (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4)) {
n = (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4);
}
size_t best_index = 0;
uint64_t best_score = 0xFFFFFFFFFFFFFFFF;
// Work in 16-bit color.
uint32_t ca = 0x101 * (0xFF & (c >> 24));
uint32_t cr = 0x101 * (0xFF & (c >> 16));
uint32_t cg = 0x101 * (0xFF & (c >> 8));
uint32_t cb = 0x101 * (0xFF & (c >> 0));
switch (palette_format.repr) {
case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY: {
bool nonpremul = palette_format.repr ==
WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL;
size_t i;
for (i = 0; i < n; i++) {
// Work in 16-bit color.
uint32_t pb = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 0]));
uint32_t pg = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 1]));
uint32_t pr = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 2]));
uint32_t pa = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 3]));
// Convert to premultiplied alpha.
if (nonpremul && (pa != 0xFFFF)) {
pb = (pb * pa) / 0xFFFF;
pg = (pg * pa) / 0xFFFF;
pr = (pr * pa) / 0xFFFF;
}
// These deltas are conceptually int32_t (signed) but after squaring,
// it's equivalent to work in uint32_t (unsigned).
pb -= cb;
pg -= cg;
pr -= cr;
pa -= ca;
uint64_t score = ((uint64_t)(pb * pb)) + ((uint64_t)(pg * pg)) +
((uint64_t)(pr * pr)) + ((uint64_t)(pa * pa));
if (best_score > score) {
best_score = score;
best_index = i;
}
}
break;
}
}
return (uint8_t)best_index;
}
// --------
static inline uint32_t //
wuffs_base__composite_nonpremul_nonpremul_u32_axxx(uint32_t dst_nonpremul,
uint32_t src_nonpremul) {
// Extract 16-bit color components.
//
// If the destination is transparent then SRC_OVER is equivalent to SRC: just
// return src_nonpremul. This isn't just an optimization (skipping the rest
// of the function's computation). It also preserves the nonpremul
// distinction between e.g. transparent red and transparent blue that would
// otherwise be lost by converting from nonpremul to premul and back.
uint32_t da = 0x101 * (0xFF & (dst_nonpremul >> 24));
if (da == 0) {
return src_nonpremul;
}
uint32_t dr = 0x101 * (0xFF & (dst_nonpremul >> 16));
uint32_t dg = 0x101 * (0xFF & (dst_nonpremul >> 8));
uint32_t db = 0x101 * (0xFF & (dst_nonpremul >> 0));
uint32_t sa = 0x101 * (0xFF & (src_nonpremul >> 24));
uint32_t sr = 0x101 * (0xFF & (src_nonpremul >> 16));
uint32_t sg = 0x101 * (0xFF & (src_nonpremul >> 8));
uint32_t sb = 0x101 * (0xFF & (src_nonpremul >> 0));
// Convert dst from nonpremul to premul.
dr = (dr * da) / 0xFFFF;
dg = (dg * da) / 0xFFFF;
db = (db * da) / 0xFFFF;
// Calculate the inverse of the src-alpha: how much of the dst to keep.
uint32_t ia = 0xFFFF - sa;
// Composite src (nonpremul) over dst (premul).
da = sa + ((da * ia) / 0xFFFF);
dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
db = ((sb * sa) + (db * ia)) / 0xFFFF;
// Convert dst from premul to nonpremul.
if (da != 0) {
dr = (dr * 0xFFFF) / da;
dg = (dg * 0xFFFF) / da;
db = (db * 0xFFFF) / da;
}
// Convert from 16-bit color to 8-bit color.
da >>= 8;
dr >>= 8;
dg >>= 8;
db >>= 8;
// Combine components.
return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
}
static inline uint64_t //
wuffs_base__composite_nonpremul_nonpremul_u64_axxx(uint64_t dst_nonpremul,
uint64_t src_nonpremul) {
// Extract components.
//
// If the destination is transparent then SRC_OVER is equivalent to SRC: just
// return src_nonpremul. This isn't just an optimization (skipping the rest
// of the function's computation). It also preserves the nonpremul
// distinction between e.g. transparent red and transparent blue that would
// otherwise be lost by converting from nonpremul to premul and back.
uint64_t da = 0xFFFF & (dst_nonpremul >> 48);
if (da == 0) {
return src_nonpremul;
}
uint64_t dr = 0xFFFF & (dst_nonpremul >> 32);
uint64_t dg = 0xFFFF & (dst_nonpremul >> 16);
uint64_t db = 0xFFFF & (dst_nonpremul >> 0);
uint64_t sa = 0xFFFF & (src_nonpremul >> 48);
uint64_t sr = 0xFFFF & (src_nonpremul >> 32);
uint64_t sg = 0xFFFF & (src_nonpremul >> 16);
uint64_t sb = 0xFFFF & (src_nonpremul >> 0);
// Convert dst from nonpremul to premul.
dr = (dr * da) / 0xFFFF;
dg = (dg * da) / 0xFFFF;
db = (db * da) / 0xFFFF;
// Calculate the inverse of the src-alpha: how much of the dst to keep.
uint64_t ia = 0xFFFF - sa;
// Composite src (nonpremul) over dst (premul).
da = sa + ((da * ia) / 0xFFFF);
dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
db = ((sb * sa) + (db * ia)) / 0xFFFF;
// Convert dst from premul to nonpremul.
if (da != 0) {
dr = (dr * 0xFFFF) / da;
dg = (dg * 0xFFFF) / da;
db = (db * 0xFFFF) / da;
}
// Combine components.
return (db << 0) | (dg << 16) | (dr << 32) | (da << 48);
}
static inline uint32_t //
wuffs_base__composite_nonpremul_premul_u32_axxx(uint32_t dst_nonpremul,
uint32_t src_premul) {
// Extract 16-bit color components.
uint32_t da = 0x101 * (0xFF & (dst_nonpremul >> 24));
uint32_t dr = 0x101 * (0xFF & (dst_nonpremul >> 16));
uint32_t dg = 0x101 * (0xFF & (dst_nonpremul >> 8));
uint32_t db = 0x101 * (0xFF & (dst_nonpremul >> 0));
uint32_t sa = 0x101 * (0xFF & (src_premul >> 24));
uint32_t sr = 0x101 * (0xFF & (src_premul >> 16));
uint32_t sg = 0x101 * (0xFF & (src_premul >> 8));
uint32_t sb = 0x101 * (0xFF & (src_premul >> 0));
// Convert dst from nonpremul to premul.
dr = (dr * da) / 0xFFFF;
dg = (dg * da) / 0xFFFF;
db = (db * da) / 0xFFFF;
// Calculate the inverse of the src-alpha: how much of the dst to keep.
uint32_t ia = 0xFFFF - sa;
// Composite src (premul) over dst (premul).
da = sa + ((da * ia) / 0xFFFF);
dr = sr + ((dr * ia) / 0xFFFF);
dg = sg + ((dg * ia) / 0xFFFF);
db = sb + ((db * ia) / 0xFFFF);
// Convert dst from premul to nonpremul.
if (da != 0) {
dr = (dr * 0xFFFF) / da;
dg = (dg * 0xFFFF) / da;
db = (db * 0xFFFF) / da;
}
// Convert from 16-bit color to 8-bit color.
da >>= 8;
dr >>= 8;
dg >>= 8;
db >>= 8;
// Combine components.
return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
}
static inline uint64_t //
wuffs_base__composite_nonpremul_premul_u64_axxx(uint64_t dst_nonpremul,
uint64_t src_premul) {
// Extract components.
uint64_t da = 0xFFFF & (dst_nonpremul >> 48);
uint64_t dr = 0xFFFF & (dst_nonpremul >> 32);
uint64_t dg = 0xFFFF & (dst_nonpremul >> 16);
uint64_t db = 0xFFFF & (dst_nonpremul >> 0);
uint64_t sa = 0xFFFF & (src_premul >> 48);
uint64_t sr = 0xFFFF & (src_premul >> 32);
uint64_t sg = 0xFFFF & (src_premul >> 16);
uint64_t sb = 0xFFFF & (src_premul >> 0);
// Convert dst from nonpremul to premul.
dr = (dr * da) / 0xFFFF;
dg = (dg * da) / 0xFFFF;
db = (db * da) / 0xFFFF;
// Calculate the inverse of the src-alpha: how much of the dst to keep.
uint64_t ia = 0xFFFF - sa;
// Composite src (premul) over dst (premul).
da = sa + ((da * ia) / 0xFFFF);
dr = sr + ((dr * ia) / 0xFFFF);
dg = sg + ((dg * ia) / 0xFFFF);
db = sb + ((db * ia) / 0xFFFF);
// Convert dst from premul to nonpremul.
if (da != 0) {
dr = (dr * 0xFFFF) / da;
dg = (dg * 0xFFFF) / da;
db = (db * 0xFFFF) / da;
}
// Combine components.
return (db << 0) | (dg << 16) | (dr << 32) | (da << 48);
}
static inline uint32_t //
wuffs_base__composite_premul_nonpremul_u32_axxx(uint32_t dst_premul,
uint32_t src_nonpremul) {
// Extract 16-bit color components.
uint32_t da = 0x101 * (0xFF & (dst_premul >> 24));
uint32_t dr = 0x101 * (0xFF & (dst_premul >> 16));
uint32_t dg = 0x101 * (0xFF & (dst_premul >> 8));
uint32_t db = 0x101 * (0xFF & (dst_premul >> 0));
uint32_t sa = 0x101 * (0xFF & (src_nonpremul >> 24));
uint32_t sr = 0x101 * (0xFF & (src_nonpremul >> 16));
uint32_t sg = 0x101 * (0xFF & (src_nonpremul >> 8));
uint32_t sb = 0x101 * (0xFF & (src_nonpremul >> 0));
// Calculate the inverse of the src-alpha: how much of the dst to keep.
uint32_t ia = 0xFFFF - sa;
// Composite src (nonpremul) over dst (premul).
da = sa + ((da * ia) / 0xFFFF);
dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
db = ((sb * sa) + (db * ia)) / 0xFFFF;
// Convert from 16-bit color to 8-bit color.
da >>= 8;
dr >>= 8;
dg >>= 8;
db >>= 8;
// Combine components.
return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
}
static inline uint64_t //
wuffs_base__composite_premul_nonpremul_u64_axxx(uint64_t dst_premul,
uint64_t src_nonpremul) {
// Extract components.
uint64_t da = 0xFFFF & (dst_premul >> 48);
uint64_t dr = 0xFFFF & (dst_premul >> 32);
uint64_t dg = 0xFFFF & (dst_premul >> 16);
uint64_t db = 0xFFFF & (dst_premul >> 0);
uint64_t sa = 0xFFFF & (src_nonpremul >> 48);
uint64_t sr = 0xFFFF & (src_nonpremul >> 32);
uint64_t sg = 0xFFFF & (src_nonpremul >> 16);
uint64_t sb = 0xFFFF & (src_nonpremul >> 0);
// Calculate the inverse of the src-alpha: how much of the dst to keep.
uint64_t ia = 0xFFFF - sa;
// Composite src (nonpremul) over dst (premul).
da = sa + ((da * ia) / 0xFFFF);
dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
db = ((sb * sa) + (db * ia)) / 0xFFFF;
// Combine components.
return (db << 0) | (dg << 16) | (dr << 32) | (da << 48);
}
static inline uint32_t //
wuffs_base__composite_premul_premul_u32_axxx(uint32_t dst_premul,
uint32_t src_premul) {
// Extract 16-bit color components.
uint32_t da = 0x101 * (0xFF & (dst_premul >> 24));
uint32_t dr = 0x101 * (0xFF & (dst_premul >> 16));
uint32_t dg = 0x101 * (0xFF & (dst_premul >> 8));
uint32_t db = 0x101 * (0xFF & (dst_premul >> 0));
uint32_t sa = 0x101 * (0xFF & (src_premul >> 24));
uint32_t sr = 0x101 * (0xFF & (src_premul >> 16));
uint32_t sg = 0x101 * (0xFF & (src_premul >> 8));
uint32_t sb = 0x101 * (0xFF & (src_premul >> 0));
// Calculate the inverse of the src-alpha: how much of the dst to keep.
uint32_t ia = 0xFFFF - sa;
// Composite src (premul) over dst (premul).
da = sa + ((da * ia) / 0xFFFF);
dr = sr + ((dr * ia) / 0xFFFF);
dg = sg + ((dg * ia) / 0xFFFF);
db = sb + ((db * ia) / 0xFFFF);
// Convert from 16-bit color to 8-bit color.
da >>= 8;
dr >>= 8;
dg >>= 8;
db >>= 8;
// Combine components.
return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
}
// --------
static uint64_t //
wuffs_base__pixel_swizzler__squash_align4_bgr_565_8888(uint8_t* dst_ptr,
size_t dst_len,
const uint8_t* src_ptr,
size_t src_len,
bool nonpremul) {
size_t len = (dst_len < src_len ? dst_len : src_len) / 4;
uint8_t* d = dst_ptr;
const uint8_t* s = src_ptr;
size_t n = len;
while (n--) {
uint32_t argb = wuffs_base__peek_u32le__no_bounds_check(s);
if (nonpremul) {
argb =
wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(argb);
}
uint32_t b5 = 0x1F & (argb >> (8 - 5));
uint32_t g6 = 0x3F & (argb >> (16 - 6));
uint32_t r5 = 0x1F & (argb >> (24 - 5));
uint32_t alpha = argb & 0xFF000000;
wuffs_base__poke_u32le__no_bounds_check(
d, alpha | (r5 << 11) | (g6 << 5) | (b5 << 0));
s += 4;
d += 4;
}
return len;
}
// --------
static uint64_t //
wuffs_base__pixel_swizzler__swap_rgb_bgr(uint8_t* dst_ptr,
size_t dst_len,
uint8_t* dst_palette_ptr,
size_t dst_palette_len,
const uint8_t* src_ptr,
size_t src_len) {
size_t len = (dst_len < src_len ? dst_len : src_len) / 3;
uint8_t* d = dst_ptr;
const uint8_t* s = src_ptr;
size_t n = len;
while (n--) {
uint8_t s0 = s[0];
uint8_t s1 = s[1];
uint8_t s2 = s[2];
d[0] = s2;
d[1] = s1;
d[2] = s0;
s += 3;
d += 3;
}
return len;
}
// ‼ WUFFS MULTI-FILE SECTION +x86_sse42
#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("pclmul,popcnt,sse4.2")
static uint64_t //
wuffs_base__pixel_swizzler__swap_rgbx_bgrx__sse42(uint8_t* dst_ptr,
size_t dst_len,
uint8_t* dst_palette_ptr,
size_t dst_palette_len,
const uint8_t* src_ptr,
size_t src_len) {
size_t len = (dst_len < src_len ? dst_len : src_len) / 4;
uint8_t* d = dst_ptr;
const uint8_t* s = src_ptr;
size_t n = len;
__m128i shuffle = _mm_set_epi8(+0x0F, +0x0C, +0x0D, +0x0E, //
+0x0B, +0x08, +0x09, +0x0A, //
+0x07, +0x04, +0x05, +0x06, //
+0x03, +0x00, +0x01, +0x02);
while (n >= 4) {
__m128i x;
x = _mm_lddqu_si128((const __m128i*)(const void*)s);
x = _mm_shuffle_epi8(x, shuffle);
_mm_storeu_si128((__m128i*)(void*)d, x);
s += 4 * 4;
d += 4 * 4;
n -= 4;
}
while (n--) {
uint8_t s0 = s[0];
uint8_t s1 = s[1];
uint8_t s2 = s[2];
uint8_t s3 = s[3];
d[0] = s2;
d[1] = s1;
d[2] = s0;
d[3] = s3;
s += 4;
d += 4;
}
return len;
}
#endif // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
// ‼ WUFFS MULTI-FILE SECTION -x86_sse42
static uint64_t //
wuffs_base__pixel_swizzler__swap_rgbx_bgrx(uint8_t* dst_ptr,
size_t dst_len,
uint8_t* dst_palette_ptr,
size_t dst_palette_len,
const uint8_t* src_ptr,
size_t src_len) {
size_t len = (dst_len < src_len ? dst_len : src_len) / 4;
uint8_t* d = dst_ptr;
const uint8_t* s = src_ptr;
size_t n = len;
while (n--) {
uint8_t s0 = s[0];
uint8_t s1 = s[1];
uint8_t s2 = s[2];
uint8_t s3 = s[3];
d[0] = s2;
d[1] = s1;
d[2] = s0;
d[3] = s3;
s += 4;
d += 4;
}
return len;
}
// --------
static uint64_t //
wuffs_base__pixel_swizzler__copy_1_1(uint8_t* dst_ptr,
size_t dst_len,
uint8_t* dst_palette_ptr,
size_t dst_palette_len,
const uint8_t* src_ptr,
size_t src_len) {
size_t len = (dst_len < src_len) ? dst_len : src_len;
if (len > 0) {
memmove(dst_ptr, src_ptr, len);
}
return len;
}
static uint64_t //
wuffs_base__pixel_swizzler__copy_2_2(uint8_t* dst_ptr,
size_t dst_len,
uint8_t* dst_palette_ptr,
size_t dst_palette_len,
const uint8_t* src_ptr,
size_t src_len) {
size_t dst_len2 = dst_len / 2;
size_t src_len2 = src_len / 2;
size_t len = (dst_len2 < src_len2) ? dst_len2 : src_len2;
if (len > 0) {
memmove(dst_ptr, src_ptr, len * 2);
}
return len;
}
static uint64_t //
wuffs_base__pixel_swizzler__copy_3_3(uint8_t* dst_ptr,
size_t dst_len,
uint8_t* dst_palette_ptr,
size_t dst_palette_len,
const uint8_t* src_ptr,
size_t src_len) {
size_t dst_len3 = dst_len / 3;
size_t src_len3 = src_len / 3;
size_t len = (dst_len3 < src_len3) ? dst_len3 : src_len3;
if (len > 0) {
memmove(dst_ptr, src_ptr, len * 3);
}
return len;
}
static uint64_t //
wuffs_base__pixel_swizzler__copy_4_4(uint8_t* dst_ptr,
size_t dst_len,
uint8_t* dst_palette_ptr,
size_t dst_palette_len,
const uint8_t* src_ptr,
size_t src_len) {
size_t dst_len4 = dst_len / 4;
size_t src_len4 = src_len / 4;
size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
if (len > 0) {
memmove(dst_ptr, src_ptr, len * 4);
}
return len;
}
static uint64_t //
wuffs_base__pixel_swizzler__copy_8_8(uint8_t* dst_ptr,
size_t dst_len,
uint8_t* dst_palette_ptr,
size_t dst_palette_len,
const uint8_t* src_ptr,
size_t src_len) {
size_t dst_len8 = dst_len / 8;
size_t src_len8 = src_len / 8;
size_t len = (dst_len8 < src_len8) ? dst_len8 : src_len8;
if (len > 0) {
memmove(dst_ptr, src_ptr, len * 8);
}
return len;
}
// --------
static uint64_t //
wuffs_base__pixel_swizzler__bgr_565__bgr(uint8_t* dst_ptr,
size_t dst_len,
uint8_t* dst_palette_ptr,
size_t dst_palette_len,
const uint8_t* src_ptr,
size_t src_len) {
size_t dst_len2 = dst_len / 2;
size_t src_len3 = src_len / 3;
size_t len = (dst_len2 < src_len3) ? dst_len2 : src_len3;
uint8_t* d = dst_ptr;
const uint8_t* s = src_ptr;
size_t n = len;