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image.cpp
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/*************************************************************************/
/* image.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "image.h"
#include "core/error_macros.h"
#include "core/hash_map.h"
#include "core/io/image_loader.h"
#include "core/io/resource_loader.h"
#include "core/math/math_funcs.h"
#include "core/os/copymem.h"
#include "core/print_string.h"
#include <stdio.h>
const char *Image::format_names[Image::FORMAT_MAX] = {
"Lum8", //luminance
"LumAlpha8", //luminance-alpha
"Red8",
"RedGreen",
"RGB8",
"RGBA8",
"RGBA4444",
"RGBA5551",
"RFloat", //float
"RGFloat",
"RGBFloat",
"RGBAFloat",
"RHalf", //half float
"RGHalf",
"RGBHalf",
"RGBAHalf",
"RGBE9995",
"DXT1 RGB8", //s3tc
"DXT3 RGBA8",
"DXT5 RGBA8",
"RGTC Red8",
"RGTC RedGreen8",
"BPTC_RGBA",
"BPTC_RGBF",
"BPTC_RGBFU",
"PVRTC2", //pvrtc
"PVRTC2A",
"PVRTC4",
"PVRTC4A",
"ETC", //etc1
"ETC2_R11", //etc2
"ETC2_R11S", //signed", NOT srgb.
"ETC2_RG11",
"ETC2_RG11S",
"ETC2_RGB8",
"ETC2_RGBA8",
"ETC2_RGB8A1",
"ETC2_RA_AS_RG",
"FORMAT_DXT5_RA_AS_RG",
};
SavePNGFunc Image::save_png_func = nullptr;
SaveEXRFunc Image::save_exr_func = nullptr;
SavePNGBufferFunc Image::save_png_buffer_func = nullptr;
void Image::_put_pixelb(int p_x, int p_y, uint32_t p_pixelsize, uint8_t *p_data, const uint8_t *p_pixel) {
uint32_t ofs = (p_y * width + p_x) * p_pixelsize;
for (uint32_t i = 0; i < p_pixelsize; i++) {
p_data[ofs + i] = p_pixel[i];
}
}
void Image::_get_pixelb(int p_x, int p_y, uint32_t p_pixelsize, const uint8_t *p_data, uint8_t *p_pixel) {
uint32_t ofs = (p_y * width + p_x) * p_pixelsize;
for (uint32_t i = 0; i < p_pixelsize; i++) {
p_pixel[i] = p_data[ofs + i];
}
}
int Image::get_format_pixel_size(Format p_format) {
switch (p_format) {
case FORMAT_L8:
return 1; //luminance
case FORMAT_LA8:
return 2; //luminance-alpha
case FORMAT_R8:
return 1;
case FORMAT_RG8:
return 2;
case FORMAT_RGB8:
return 3;
case FORMAT_RGBA8:
return 4;
case FORMAT_RGBA4444:
return 2;
case FORMAT_RGB565:
return 2;
case FORMAT_RF:
return 4; //float
case FORMAT_RGF:
return 8;
case FORMAT_RGBF:
return 12;
case FORMAT_RGBAF:
return 16;
case FORMAT_RH:
return 2; //half float
case FORMAT_RGH:
return 4;
case FORMAT_RGBH:
return 6;
case FORMAT_RGBAH:
return 8;
case FORMAT_RGBE9995:
return 4;
case FORMAT_DXT1:
return 1; //s3tc bc1
case FORMAT_DXT3:
return 1; //bc2
case FORMAT_DXT5:
return 1; //bc3
case FORMAT_RGTC_R:
return 1; //bc4
case FORMAT_RGTC_RG:
return 1; //bc5
case FORMAT_BPTC_RGBA:
return 1; //btpc bc6h
case FORMAT_BPTC_RGBF:
return 1; //float /
case FORMAT_BPTC_RGBFU:
return 1; //unsigned float
case FORMAT_PVRTC2:
return 1; //pvrtc
case FORMAT_PVRTC2A:
return 1;
case FORMAT_PVRTC4:
return 1;
case FORMAT_PVRTC4A:
return 1;
case FORMAT_ETC:
return 1; //etc1
case FORMAT_ETC2_R11:
return 1; //etc2
case FORMAT_ETC2_R11S:
return 1; //signed: return 1; NOT srgb.
case FORMAT_ETC2_RG11:
return 1;
case FORMAT_ETC2_RG11S:
return 1;
case FORMAT_ETC2_RGB8:
return 1;
case FORMAT_ETC2_RGBA8:
return 1;
case FORMAT_ETC2_RGB8A1:
return 1;
case FORMAT_ETC2_RA_AS_RG:
return 1;
case FORMAT_DXT5_RA_AS_RG:
return 1;
case FORMAT_MAX: {
}
}
return 0;
}
void Image::get_format_min_pixel_size(Format p_format, int &r_w, int &r_h) {
switch (p_format) {
case FORMAT_DXT1: //s3tc bc1
case FORMAT_DXT3: //bc2
case FORMAT_DXT5: //bc3
case FORMAT_RGTC_R: //bc4
case FORMAT_RGTC_RG: { //bc5 case case FORMAT_DXT1:
r_w = 4;
r_h = 4;
} break;
case FORMAT_PVRTC2:
case FORMAT_PVRTC2A: {
r_w = 16;
r_h = 8;
} break;
case FORMAT_PVRTC4A:
case FORMAT_PVRTC4: {
r_w = 8;
r_h = 8;
} break;
case FORMAT_ETC: {
r_w = 4;
r_h = 4;
} break;
case FORMAT_BPTC_RGBA:
case FORMAT_BPTC_RGBF:
case FORMAT_BPTC_RGBFU: {
r_w = 4;
r_h = 4;
} break;
case FORMAT_ETC2_R11: //etc2
case FORMAT_ETC2_R11S: //signed: NOT srgb.
case FORMAT_ETC2_RG11:
case FORMAT_ETC2_RG11S:
case FORMAT_ETC2_RGB8:
case FORMAT_ETC2_RGBA8:
case FORMAT_ETC2_RGB8A1:
case FORMAT_ETC2_RA_AS_RG:
case FORMAT_DXT5_RA_AS_RG: {
r_w = 4;
r_h = 4;
} break;
default: {
r_w = 1;
r_h = 1;
} break;
}
}
int Image::get_format_pixel_rshift(Format p_format) {
if (p_format == FORMAT_DXT1 || p_format == FORMAT_RGTC_R || p_format == FORMAT_PVRTC4 || p_format == FORMAT_PVRTC4A || p_format == FORMAT_ETC || p_format == FORMAT_ETC2_R11 || p_format == FORMAT_ETC2_R11S || p_format == FORMAT_ETC2_RGB8 || p_format == FORMAT_ETC2_RGB8A1) {
return 1;
} else if (p_format == FORMAT_PVRTC2 || p_format == FORMAT_PVRTC2A) {
return 2;
} else {
return 0;
}
}
int Image::get_format_block_size(Format p_format) {
switch (p_format) {
case FORMAT_DXT1: //s3tc bc1
case FORMAT_DXT3: //bc2
case FORMAT_DXT5: //bc3
case FORMAT_RGTC_R: //bc4
case FORMAT_RGTC_RG: { //bc5 case case FORMAT_DXT1:
return 4;
}
case FORMAT_PVRTC2:
case FORMAT_PVRTC2A: {
return 4;
}
case FORMAT_PVRTC4A:
case FORMAT_PVRTC4: {
return 4;
}
case FORMAT_ETC: {
return 4;
}
case FORMAT_BPTC_RGBA:
case FORMAT_BPTC_RGBF:
case FORMAT_BPTC_RGBFU: {
return 4;
}
case FORMAT_ETC2_R11: //etc2
case FORMAT_ETC2_R11S: //signed: NOT srgb.
case FORMAT_ETC2_RG11:
case FORMAT_ETC2_RG11S:
case FORMAT_ETC2_RGB8:
case FORMAT_ETC2_RGBA8:
case FORMAT_ETC2_RGB8A1:
case FORMAT_ETC2_RA_AS_RG: //used to make basis universal happy
case FORMAT_DXT5_RA_AS_RG: //used to make basis universal happy
{
return 4;
}
default: {
}
}
return 1;
}
void Image::_get_mipmap_offset_and_size(int p_mipmap, int &r_offset, int &r_width, int &r_height) const {
int w = width;
int h = height;
int ofs = 0;
int pixel_size = get_format_pixel_size(format);
int pixel_rshift = get_format_pixel_rshift(format);
int block = get_format_block_size(format);
int minw, minh;
get_format_min_pixel_size(format, minw, minh);
for (int i = 0; i < p_mipmap; i++) {
int bw = w % block != 0 ? w + (block - w % block) : w;
int bh = h % block != 0 ? h + (block - h % block) : h;
int s = bw * bh;
s *= pixel_size;
s >>= pixel_rshift;
ofs += s;
w = MAX(minw, w >> 1);
h = MAX(minh, h >> 1);
}
r_offset = ofs;
r_width = w;
r_height = h;
}
int Image::get_mipmap_offset(int p_mipmap) const {
ERR_FAIL_INDEX_V(p_mipmap, get_mipmap_count() + 1, -1);
int ofs, w, h;
_get_mipmap_offset_and_size(p_mipmap, ofs, w, h);
return ofs;
}
int Image::get_mipmap_byte_size(int p_mipmap) const {
ERR_FAIL_INDEX_V(p_mipmap, get_mipmap_count() + 1, -1);
int ofs, w, h;
_get_mipmap_offset_and_size(p_mipmap, ofs, w, h);
int ofs2;
_get_mipmap_offset_and_size(p_mipmap + 1, ofs2, w, h);
return ofs2 - ofs;
}
void Image::get_mipmap_offset_and_size(int p_mipmap, int &r_ofs, int &r_size) const {
int ofs, w, h;
_get_mipmap_offset_and_size(p_mipmap, ofs, w, h);
int ofs2;
_get_mipmap_offset_and_size(p_mipmap + 1, ofs2, w, h);
r_ofs = ofs;
r_size = ofs2 - ofs;
}
void Image::get_mipmap_offset_size_and_dimensions(int p_mipmap, int &r_ofs, int &r_size, int &w, int &h) const {
int ofs;
_get_mipmap_offset_and_size(p_mipmap, ofs, w, h);
int ofs2, w2, h2;
_get_mipmap_offset_and_size(p_mipmap + 1, ofs2, w2, h2);
r_ofs = ofs;
r_size = ofs2 - ofs;
}
int Image::get_width() const {
return width;
}
int Image::get_height() const {
return height;
}
Vector2 Image::get_size() const {
return Vector2(width, height);
}
bool Image::has_mipmaps() const {
return mipmaps;
}
int Image::get_mipmap_count() const {
if (mipmaps) {
return get_image_required_mipmaps(width, height, format);
} else {
return 0;
}
}
//using template generates perfectly optimized code due to constant expression reduction and unused variable removal present in all compilers
template <uint32_t read_bytes, bool read_alpha, uint32_t write_bytes, bool write_alpha, bool read_gray, bool write_gray>
static void _convert(int p_width, int p_height, const uint8_t *p_src, uint8_t *p_dst) {
uint32_t max_bytes = MAX(read_bytes, write_bytes);
for (int y = 0; y < p_height; y++) {
for (int x = 0; x < p_width; x++) {
const uint8_t *rofs = &p_src[((y * p_width) + x) * (read_bytes + (read_alpha ? 1 : 0))];
uint8_t *wofs = &p_dst[((y * p_width) + x) * (write_bytes + (write_alpha ? 1 : 0))];
uint8_t rgba[4];
if (read_gray) {
rgba[0] = rofs[0];
rgba[1] = rofs[0];
rgba[2] = rofs[0];
} else {
for (uint32_t i = 0; i < max_bytes; i++) {
rgba[i] = (i < read_bytes) ? rofs[i] : 0;
}
}
if (read_alpha || write_alpha) {
rgba[3] = read_alpha ? rofs[read_bytes] : 255;
}
if (write_gray) {
//TODO: not correct grayscale, should use fixed point version of actual weights
wofs[0] = uint8_t((uint16_t(rofs[0]) + uint16_t(rofs[1]) + uint16_t(rofs[2])) / 3);
} else {
for (uint32_t i = 0; i < write_bytes; i++) {
wofs[i] = rgba[i];
}
}
if (write_alpha) {
wofs[write_bytes] = rgba[3];
}
}
}
}
void Image::convert(Format p_new_format) {
if (data.size() == 0) {
return;
}
if (p_new_format == format) {
return;
}
if (format > FORMAT_RGBE9995 || p_new_format > FORMAT_RGBE9995) {
ERR_FAIL_MSG("Cannot convert to <-> from compressed formats. Use compress() and decompress() instead.");
} else if (format > FORMAT_RGBA8 || p_new_format > FORMAT_RGBA8) {
//use put/set pixel which is slower but works with non byte formats
Image new_img(width, height, false, p_new_format);
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
new_img.set_pixel(i, j, get_pixel(i, j));
}
}
if (has_mipmaps()) {
new_img.generate_mipmaps();
}
_copy_internals_from(new_img);
return;
}
Image new_img(width, height, false, p_new_format);
const uint8_t *rptr = data.ptr();
uint8_t *wptr = new_img.data.ptrw();
int conversion_type = format | p_new_format << 8;
switch (conversion_type) {
case FORMAT_L8 | (FORMAT_LA8 << 8):
_convert<1, false, 1, true, true, true>(width, height, rptr, wptr);
break;
case FORMAT_L8 | (FORMAT_R8 << 8):
_convert<1, false, 1, false, true, false>(width, height, rptr, wptr);
break;
case FORMAT_L8 | (FORMAT_RG8 << 8):
_convert<1, false, 2, false, true, false>(width, height, rptr, wptr);
break;
case FORMAT_L8 | (FORMAT_RGB8 << 8):
_convert<1, false, 3, false, true, false>(width, height, rptr, wptr);
break;
case FORMAT_L8 | (FORMAT_RGBA8 << 8):
_convert<1, false, 3, true, true, false>(width, height, rptr, wptr);
break;
case FORMAT_LA8 | (FORMAT_L8 << 8):
_convert<1, true, 1, false, true, true>(width, height, rptr, wptr);
break;
case FORMAT_LA8 | (FORMAT_R8 << 8):
_convert<1, true, 1, false, true, false>(width, height, rptr, wptr);
break;
case FORMAT_LA8 | (FORMAT_RG8 << 8):
_convert<1, true, 2, false, true, false>(width, height, rptr, wptr);
break;
case FORMAT_LA8 | (FORMAT_RGB8 << 8):
_convert<1, true, 3, false, true, false>(width, height, rptr, wptr);
break;
case FORMAT_LA8 | (FORMAT_RGBA8 << 8):
_convert<1, true, 3, true, true, false>(width, height, rptr, wptr);
break;
case FORMAT_R8 | (FORMAT_L8 << 8):
_convert<1, false, 1, false, false, true>(width, height, rptr, wptr);
break;
case FORMAT_R8 | (FORMAT_LA8 << 8):
_convert<1, false, 1, true, false, true>(width, height, rptr, wptr);
break;
case FORMAT_R8 | (FORMAT_RG8 << 8):
_convert<1, false, 2, false, false, false>(width, height, rptr, wptr);
break;
case FORMAT_R8 | (FORMAT_RGB8 << 8):
_convert<1, false, 3, false, false, false>(width, height, rptr, wptr);
break;
case FORMAT_R8 | (FORMAT_RGBA8 << 8):
_convert<1, false, 3, true, false, false>(width, height, rptr, wptr);
break;
case FORMAT_RG8 | (FORMAT_L8 << 8):
_convert<2, false, 1, false, false, true>(width, height, rptr, wptr);
break;
case FORMAT_RG8 | (FORMAT_LA8 << 8):
_convert<2, false, 1, true, false, true>(width, height, rptr, wptr);
break;
case FORMAT_RG8 | (FORMAT_R8 << 8):
_convert<2, false, 1, false, false, false>(width, height, rptr, wptr);
break;
case FORMAT_RG8 | (FORMAT_RGB8 << 8):
_convert<2, false, 3, false, false, false>(width, height, rptr, wptr);
break;
case FORMAT_RG8 | (FORMAT_RGBA8 << 8):
_convert<2, false, 3, true, false, false>(width, height, rptr, wptr);
break;
case FORMAT_RGB8 | (FORMAT_L8 << 8):
_convert<3, false, 1, false, false, true>(width, height, rptr, wptr);
break;
case FORMAT_RGB8 | (FORMAT_LA8 << 8):
_convert<3, false, 1, true, false, true>(width, height, rptr, wptr);
break;
case FORMAT_RGB8 | (FORMAT_R8 << 8):
_convert<3, false, 1, false, false, false>(width, height, rptr, wptr);
break;
case FORMAT_RGB8 | (FORMAT_RG8 << 8):
_convert<3, false, 2, false, false, false>(width, height, rptr, wptr);
break;
case FORMAT_RGB8 | (FORMAT_RGBA8 << 8):
_convert<3, false, 3, true, false, false>(width, height, rptr, wptr);
break;
case FORMAT_RGBA8 | (FORMAT_L8 << 8):
_convert<3, true, 1, false, false, true>(width, height, rptr, wptr);
break;
case FORMAT_RGBA8 | (FORMAT_LA8 << 8):
_convert<3, true, 1, true, false, true>(width, height, rptr, wptr);
break;
case FORMAT_RGBA8 | (FORMAT_R8 << 8):
_convert<3, true, 1, false, false, false>(width, height, rptr, wptr);
break;
case FORMAT_RGBA8 | (FORMAT_RG8 << 8):
_convert<3, true, 2, false, false, false>(width, height, rptr, wptr);
break;
case FORMAT_RGBA8 | (FORMAT_RGB8 << 8):
_convert<3, true, 3, false, false, false>(width, height, rptr, wptr);
break;
}
bool gen_mipmaps = mipmaps;
_copy_internals_from(new_img);
if (gen_mipmaps) {
generate_mipmaps();
}
}
Image::Format Image::get_format() const {
return format;
}
static double _bicubic_interp_kernel(double x) {
x = ABS(x);
double bc = 0;
if (x <= 1) {
bc = (1.5 * x - 2.5) * x * x + 1;
} else if (x < 2) {
bc = ((-0.5 * x + 2.5) * x - 4) * x + 2;
}
return bc;
}
template <int CC, class T>
static void _scale_cubic(const uint8_t *__restrict p_src, uint8_t *__restrict p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) {
// get source image size
int width = p_src_width;
int height = p_src_height;
double xfac = (double)width / p_dst_width;
double yfac = (double)height / p_dst_height;
// coordinates of source points and coefficients
double ox, oy, dx, dy, k1, k2;
int ox1, oy1, ox2, oy2;
// destination pixel values
// width and height decreased by 1
int ymax = height - 1;
int xmax = width - 1;
// temporary pointer
for (uint32_t y = 0; y < p_dst_height; y++) {
// Y coordinates
oy = (double)y * yfac - 0.5f;
oy1 = (int)oy;
dy = oy - (double)oy1;
for (uint32_t x = 0; x < p_dst_width; x++) {
// X coordinates
ox = (double)x * xfac - 0.5f;
ox1 = (int)ox;
dx = ox - (double)ox1;
// initial pixel value
T *__restrict dst = ((T *)p_dst) + (y * p_dst_width + x) * CC;
double color[CC];
for (int i = 0; i < CC; i++) {
color[i] = 0;
}
for (int n = -1; n < 3; n++) {
// get Y coefficient
k1 = _bicubic_interp_kernel(dy - (double)n);
oy2 = oy1 + n;
if (oy2 < 0) {
oy2 = 0;
}
if (oy2 > ymax) {
oy2 = ymax;
}
for (int m = -1; m < 3; m++) {
// get X coefficient
k2 = k1 * _bicubic_interp_kernel((double)m - dx);
ox2 = ox1 + m;
if (ox2 < 0) {
ox2 = 0;
}
if (ox2 > xmax) {
ox2 = xmax;
}
// get pixel of original image
const T *__restrict p = ((T *)p_src) + (oy2 * p_src_width + ox2) * CC;
for (int i = 0; i < CC; i++) {
if (sizeof(T) == 2) { //half float
color[i] = Math::half_to_float(p[i]);
} else {
color[i] += p[i] * k2;
}
}
}
}
for (int i = 0; i < CC; i++) {
if (sizeof(T) == 1) { //byte
dst[i] = CLAMP(Math::fast_ftoi(color[i]), 0, 255);
} else if (sizeof(T) == 2) { //half float
dst[i] = Math::make_half_float(color[i]);
} else {
dst[i] = color[i];
}
}
}
}
}
template <int CC, class T>
static void _scale_bilinear(const uint8_t *__restrict p_src, uint8_t *__restrict p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) {
enum {
FRAC_BITS = 8,
FRAC_LEN = (1 << FRAC_BITS),
FRAC_HALF = (FRAC_LEN >> 1),
FRAC_MASK = FRAC_LEN - 1
};
for (uint32_t i = 0; i < p_dst_height; i++) {
// Add 0.5 in order to interpolate based on pixel center
uint32_t src_yofs_up_fp = (i + 0.5) * p_src_height * FRAC_LEN / p_dst_height;
// Calculate nearest src pixel center above current, and truncate to get y index
uint32_t src_yofs_up = src_yofs_up_fp >= FRAC_HALF ? (src_yofs_up_fp - FRAC_HALF) >> FRAC_BITS : 0;
uint32_t src_yofs_down = (src_yofs_up_fp + FRAC_HALF) >> FRAC_BITS;
if (src_yofs_down >= p_src_height) {
src_yofs_down = p_src_height - 1;
}
// Calculate distance to pixel center of src_yofs_up
uint32_t src_yofs_frac = src_yofs_up_fp & FRAC_MASK;
src_yofs_frac = src_yofs_frac >= FRAC_HALF ? src_yofs_frac - FRAC_HALF : src_yofs_frac + FRAC_HALF;
uint32_t y_ofs_up = src_yofs_up * p_src_width * CC;
uint32_t y_ofs_down = src_yofs_down * p_src_width * CC;
for (uint32_t j = 0; j < p_dst_width; j++) {
uint32_t src_xofs_left_fp = (j + 0.5) * p_src_width * FRAC_LEN / p_dst_width;
uint32_t src_xofs_left = src_xofs_left_fp >= FRAC_HALF ? (src_xofs_left_fp - FRAC_HALF) >> FRAC_BITS : 0;
uint32_t src_xofs_right = (src_xofs_left_fp + FRAC_HALF) >> FRAC_BITS;
if (src_xofs_right >= p_src_width) {
src_xofs_right = p_src_width - 1;
}
uint32_t src_xofs_frac = src_xofs_left_fp & FRAC_MASK;
src_xofs_frac = src_xofs_frac >= FRAC_HALF ? src_xofs_frac - FRAC_HALF : src_xofs_frac + FRAC_HALF;
src_xofs_left *= CC;
src_xofs_right *= CC;
for (uint32_t l = 0; l < CC; l++) {
if (sizeof(T) == 1) { //uint8
uint32_t p00 = p_src[y_ofs_up + src_xofs_left + l] << FRAC_BITS;
uint32_t p10 = p_src[y_ofs_up + src_xofs_right + l] << FRAC_BITS;
uint32_t p01 = p_src[y_ofs_down + src_xofs_left + l] << FRAC_BITS;
uint32_t p11 = p_src[y_ofs_down + src_xofs_right + l] << FRAC_BITS;
uint32_t interp_up = p00 + (((p10 - p00) * src_xofs_frac) >> FRAC_BITS);
uint32_t interp_down = p01 + (((p11 - p01) * src_xofs_frac) >> FRAC_BITS);
uint32_t interp = interp_up + (((interp_down - interp_up) * src_yofs_frac) >> FRAC_BITS);
interp >>= FRAC_BITS;
p_dst[i * p_dst_width * CC + j * CC + l] = interp;
} else if (sizeof(T) == 2) { //half float
float xofs_frac = float(src_xofs_frac) / (1 << FRAC_BITS);
float yofs_frac = float(src_yofs_frac) / (1 << FRAC_BITS);
const T *src = ((const T *)p_src);
T *dst = ((T *)p_dst);
float p00 = Math::half_to_float(src[y_ofs_up + src_xofs_left + l]);
float p10 = Math::half_to_float(src[y_ofs_up + src_xofs_right + l]);
float p01 = Math::half_to_float(src[y_ofs_down + src_xofs_left + l]);
float p11 = Math::half_to_float(src[y_ofs_down + src_xofs_right + l]);
float interp_up = p00 + (p10 - p00) * xofs_frac;
float interp_down = p01 + (p11 - p01) * xofs_frac;
float interp = interp_up + ((interp_down - interp_up) * yofs_frac);
dst[i * p_dst_width * CC + j * CC + l] = Math::make_half_float(interp);
} else if (sizeof(T) == 4) { //float
float xofs_frac = float(src_xofs_frac) / (1 << FRAC_BITS);
float yofs_frac = float(src_yofs_frac) / (1 << FRAC_BITS);
const T *src = ((const T *)p_src);
T *dst = ((T *)p_dst);
float p00 = src[y_ofs_up + src_xofs_left + l];
float p10 = src[y_ofs_up + src_xofs_right + l];
float p01 = src[y_ofs_down + src_xofs_left + l];
float p11 = src[y_ofs_down + src_xofs_right + l];
float interp_up = p00 + (p10 - p00) * xofs_frac;
float interp_down = p01 + (p11 - p01) * xofs_frac;
float interp = interp_up + ((interp_down - interp_up) * yofs_frac);
dst[i * p_dst_width * CC + j * CC + l] = interp;
}
}
}
}
}
template <int CC, class T>
static void _scale_nearest(const uint8_t *__restrict p_src, uint8_t *__restrict p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) {
for (uint32_t i = 0; i < p_dst_height; i++) {
uint32_t src_yofs = i * p_src_height / p_dst_height;
uint32_t y_ofs = src_yofs * p_src_width * CC;
for (uint32_t j = 0; j < p_dst_width; j++) {
uint32_t src_xofs = j * p_src_width / p_dst_width;
src_xofs *= CC;
for (uint32_t l = 0; l < CC; l++) {
const T *src = ((const T *)p_src);
T *dst = ((T *)p_dst);
T p = src[y_ofs + src_xofs + l];
dst[i * p_dst_width * CC + j * CC + l] = p;
}
}
}
}
#define LANCZOS_TYPE 3
static float _lanczos(float p_x) {
return Math::abs(p_x) >= LANCZOS_TYPE ? 0 : Math::sincn(p_x) * Math::sincn(p_x / LANCZOS_TYPE);
}
template <int CC, class T>
static void _scale_lanczos(const uint8_t *__restrict p_src, uint8_t *__restrict p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) {
int32_t src_width = p_src_width;
int32_t src_height = p_src_height;
int32_t dst_height = p_dst_height;
int32_t dst_width = p_dst_width;
uint32_t buffer_size = src_height * dst_width * CC;
float *buffer = memnew_arr(float, buffer_size); // Store the first pass in a buffer
{ // FIRST PASS (horizontal)
float x_scale = float(src_width) / float(dst_width);
float scale_factor = MAX(x_scale, 1); // A larger kernel is required only when downscaling
int32_t half_kernel = LANCZOS_TYPE * scale_factor;
float *kernel = memnew_arr(float, half_kernel * 2);
for (int32_t buffer_x = 0; buffer_x < dst_width; buffer_x++) {
// The corresponding point on the source image
float src_x = (buffer_x + 0.5f) * x_scale; // Offset by 0.5 so it uses the pixel's center
int32_t start_x = MAX(0, int32_t(src_x) - half_kernel + 1);
int32_t end_x = MIN(src_width - 1, int32_t(src_x) + half_kernel);
// Create the kernel used by all the pixels of the column
for (int32_t target_x = start_x; target_x <= end_x; target_x++) {
kernel[target_x - start_x] = _lanczos((target_x + 0.5f - src_x) / scale_factor);
}
for (int32_t buffer_y = 0; buffer_y < src_height; buffer_y++) {
float pixel[CC] = { 0 };
float weight = 0;
for (int32_t target_x = start_x; target_x <= end_x; target_x++) {
float lanczos_val = kernel[target_x - start_x];
weight += lanczos_val;
const T *__restrict src_data = ((const T *)p_src) + (buffer_y * src_width + target_x) * CC;
for (uint32_t i = 0; i < CC; i++) {
if (sizeof(T) == 2) { //half float
pixel[i] += Math::half_to_float(src_data[i]) * lanczos_val;
} else {
pixel[i] += src_data[i] * lanczos_val;
}
}
}
float *dst_data = ((float *)buffer) + (buffer_y * dst_width + buffer_x) * CC;
for (uint32_t i = 0; i < CC; i++) {
dst_data[i] = pixel[i] / weight; // Normalize the sum of all the samples
}
}
}
memdelete_arr(kernel);
} // End of first pass
{ // SECOND PASS (vertical + result)
float y_scale = float(src_height) / float(dst_height);
float scale_factor = MAX(y_scale, 1);
int32_t half_kernel = LANCZOS_TYPE * scale_factor;
float *kernel = memnew_arr(float, half_kernel * 2);
for (int32_t dst_y = 0; dst_y < dst_height; dst_y++) {
float buffer_y = (dst_y + 0.5f) * y_scale;
int32_t start_y = MAX(0, int32_t(buffer_y) - half_kernel + 1);
int32_t end_y = MIN(src_height - 1, int32_t(buffer_y) + half_kernel);
for (int32_t target_y = start_y; target_y <= end_y; target_y++) {
kernel[target_y - start_y] = _lanczos((target_y + 0.5f - buffer_y) / scale_factor);
}
for (int32_t dst_x = 0; dst_x < dst_width; dst_x++) {
float pixel[CC] = { 0 };
float weight = 0;
for (int32_t target_y = start_y; target_y <= end_y; target_y++) {
float lanczos_val = kernel[target_y - start_y];
weight += lanczos_val;
float *buffer_data = ((float *)buffer) + (target_y * dst_width + dst_x) * CC;
for (uint32_t i = 0; i < CC; i++) {
pixel[i] += buffer_data[i] * lanczos_val;
}
}
T *dst_data = ((T *)p_dst) + (dst_y * dst_width + dst_x) * CC;
for (uint32_t i = 0; i < CC; i++) {
pixel[i] /= weight;
if (sizeof(T) == 1) { //byte
dst_data[i] = CLAMP(Math::fast_ftoi(pixel[i]), 0, 255);
} else if (sizeof(T) == 2) { //half float
dst_data[i] = Math::make_half_float(pixel[i]);
} else { // float
dst_data[i] = pixel[i];
}
}
}
}
memdelete_arr(kernel);
} // End of second pass
memdelete_arr(buffer);
}
static void _overlay(const uint8_t *__restrict p_src, uint8_t *__restrict p_dst, float p_alpha, uint32_t p_width, uint32_t p_height, uint32_t p_pixel_size) {
uint16_t alpha = MIN((uint16_t)(p_alpha * 256.0f), 256);
for (uint32_t i = 0; i < p_width * p_height * p_pixel_size; i++) {
p_dst[i] = (p_dst[i] * (256 - alpha) + p_src[i] * alpha) >> 8;
}
}
bool Image::is_size_po2() const {
return uint32_t(width) == next_power_of_2(width) && uint32_t(height) == next_power_of_2(height);
}
void Image::resize_to_po2(bool p_square) {
ERR_FAIL_COND_MSG(!_can_modify(format), "Cannot resize in compressed or custom image formats.");
int w = next_power_of_2(width);
int h = next_power_of_2(height);
if (p_square) {
w = h = MAX(w, h);
}
if (w == width && h == height) {
if (!p_square || w == h) {
return; //nothing to do
}
}
resize(w, h);
}
void Image::resize(int p_width, int p_height, Interpolation p_interpolation) {
ERR_FAIL_COND_MSG(data.size() == 0, "Cannot resize image before creating it, use create() or create_from_data() first.");
ERR_FAIL_COND_MSG(!_can_modify(format), "Cannot resize in compressed or custom image formats.");
bool mipmap_aware = p_interpolation == INTERPOLATE_TRILINEAR /* || p_interpolation == INTERPOLATE_TRICUBIC */;
ERR_FAIL_COND_MSG(p_width <= 0, "Image width must be greater than 0.");
ERR_FAIL_COND_MSG(p_height <= 0, "Image height must be greater than 0.");
ERR_FAIL_COND_MSG(p_width > MAX_WIDTH, "Image width cannot be greater than " + itos(MAX_WIDTH) + ".");
ERR_FAIL_COND_MSG(p_height > MAX_HEIGHT, "Image height cannot be greater than " + itos(MAX_HEIGHT) + ".");
ERR_FAIL_COND_MSG(p_width * p_height > MAX_PIXELS, "Too many pixels for image, maximum is " + itos(MAX_PIXELS));
if (p_width == width && p_height == height) {
return;
}
Image dst(p_width, p_height, false, format);
// Setup mipmap-aware scaling
Image dst2;
int mip1 = 0;
int mip2 = 0;
float mip1_weight = 0;
if (mipmap_aware) {
float avg_scale = ((float)p_width / width + (float)p_height / height) * 0.5f;
if (avg_scale >= 1.0f) {
mipmap_aware = false;
} else {
float level = Math::log(1.0f / avg_scale) / Math::log(2.0f);
mip1 = CLAMP((int)Math::floor(level), 0, get_mipmap_count());
mip2 = CLAMP((int)Math::ceil(level), 0, get_mipmap_count());
mip1_weight = 1.0f - (level - mip1);
}
}
bool interpolate_mipmaps = mipmap_aware && mip1 != mip2;
if (interpolate_mipmaps) {
dst2.create(p_width, p_height, false, format);
}
bool had_mipmaps = mipmaps;
if (interpolate_mipmaps && !had_mipmaps) {
generate_mipmaps();
}
// --
const uint8_t *r = data.ptr();
const unsigned char *r_ptr = r;
uint8_t *w = dst.data.ptrw();
unsigned char *w_ptr = w;
switch (p_interpolation) {
case INTERPOLATE_NEAREST: {
if (format >= FORMAT_L8 && format <= FORMAT_RGBA8) {
switch (get_format_pixel_size(format)) {
case 1:
_scale_nearest<1, uint8_t>(r_ptr, w_ptr, width, height, p_width, p_height);
break;
case 2:
_scale_nearest<2, uint8_t>(r_ptr, w_ptr, width, height, p_width, p_height);
break;
case 3: