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-rw-r--r--core/image.cpp112
1 files changed, 100 insertions, 12 deletions
diff --git a/core/image.cpp b/core/image.cpp
index b9386a1b6d..19440d1718 100644
--- a/core/image.cpp
+++ b/core/image.cpp
@@ -33,6 +33,7 @@
#include "core/io/image_loader.h"
#include "core/os/copymem.h"
#include "hash_map.h"
+#include "math_funcs.h"
#include "print_string.h"
#include "thirdparty/misc/hq2x.h"
@@ -525,7 +526,7 @@ static double _bicubic_interp_kernel(double x) {
}
template <int CC>
-static void _scale_cubic(const uint8_t *p_src, uint8_t *p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) {
+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;
@@ -555,7 +556,7 @@ static void _scale_cubic(const uint8_t *p_src, uint8_t *p_dst, uint32_t p_src_wi
// initial pixel value
- uint8_t *dst = p_dst + (y * p_dst_width + x) * CC;
+ uint8_t *__restrict dst = p_dst + (y * p_dst_width + x) * CC;
double color[CC];
for (int i = 0; i < CC; i++) {
@@ -583,7 +584,7 @@ static void _scale_cubic(const uint8_t *p_src, uint8_t *p_dst, uint32_t p_src_wi
ox2 = xmax;
// get pixel of original image
- const uint8_t *p = p_src + (oy2 * p_src_width + ox2) * CC;
+ const uint8_t *__restrict p = p_src + (oy2 * p_src_width + ox2) * CC;
for (int i = 0; i < CC; i++) {
@@ -600,7 +601,7 @@ static void _scale_cubic(const uint8_t *p_src, uint8_t *p_dst, uint32_t p_src_wi
}
template <int CC>
-static void _scale_bilinear(const uint8_t *p_src, uint8_t *p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) {
+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,
@@ -655,7 +656,7 @@ static void _scale_bilinear(const uint8_t *p_src, uint8_t *p_dst, uint32_t p_src
}
template <int CC>
-static void _scale_nearest(const uint8_t *p_src, uint8_t *p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) {
+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++) {
@@ -676,6 +677,16 @@ static void _scale_nearest(const uint8_t *p_src, uint8_t *p_dst, uint32_t p_src_
}
}
+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 = CLAMP((uint16_t)(p_alpha * 256.0f), 0, 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;
+ }
+}
+
void Image::resize_to_po2(bool p_square) {
if (!_can_modify(format)) {
@@ -707,6 +718,8 @@ void Image::resize(int p_width, int p_height, Interpolation p_interpolation) {
ERR_FAIL();
}
+ bool mipmap_aware = p_interpolation == INTERPOLATE_TRILINEAR /* || p_interpolation == INTERPOLATE_TRICUBIC */;
+
ERR_FAIL_COND(p_width <= 0);
ERR_FAIL_COND(p_height <= 0);
ERR_FAIL_COND(p_width > MAX_WIDTH);
@@ -717,6 +730,32 @@ void Image::resize(int p_width, int p_height, Interpolation p_interpolation) {
Image dst(p_width, p_height, 0, format);
+ // Setup mipmap-aware scaling
+ Image dst2;
+ int mip1;
+ int mip2;
+ float mip1_weight;
+ 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, 0, format);
+ }
+ bool had_mipmaps = mipmaps;
+ if (interpolate_mipmaps && !had_mipmaps) {
+ generate_mipmaps();
+ }
+ // --
+
PoolVector<uint8_t>::Read r = data.read();
const unsigned char *r_ptr = r.ptr();
@@ -734,13 +773,57 @@ void Image::resize(int p_width, int p_height, Interpolation p_interpolation) {
case 4: _scale_nearest<4>(r_ptr, w_ptr, width, height, p_width, p_height); break;
}
} break;
- case INTERPOLATE_BILINEAR: {
+ case INTERPOLATE_BILINEAR:
+ case INTERPOLATE_TRILINEAR: {
+
+ for (int i = 0; i < 2; ++i) {
+ int src_width;
+ int src_height;
+ const unsigned char *src_ptr;
+
+ if (!mipmap_aware) {
+ if (i == 0) {
+ // Standard behavior
+ src_width = width;
+ src_height = height;
+ src_ptr = r_ptr;
+ } else {
+ // No need for a second iteration
+ break;
+ }
+ } else {
+ if (i == 0) {
+ // Read from the first mipmap that will be interpolated
+ // (if both levels are the same, we will not interpolate, but at least we'll sample from the right level)
+ int offs;
+ _get_mipmap_offset_and_size(mip1, offs, src_width, src_height);
+ src_ptr = r_ptr + offs;
+ } else if (!interpolate_mipmaps) {
+ // No need generate a second image
+ break;
+ } else {
+ // Switch to read from the second mipmap that will be interpolated
+ int offs;
+ _get_mipmap_offset_and_size(mip2, offs, src_width, src_height);
+ src_ptr = r_ptr + offs;
+ // Switch to write to the second destination image
+ w = dst2.data.write();
+ w_ptr = w.ptr();
+ }
+ }
- switch (get_format_pixel_size(format)) {
- case 1: _scale_bilinear<1>(r_ptr, w_ptr, width, height, p_width, p_height); break;
- case 2: _scale_bilinear<2>(r_ptr, w_ptr, width, height, p_width, p_height); break;
- case 3: _scale_bilinear<3>(r_ptr, w_ptr, width, height, p_width, p_height); break;
- case 4: _scale_bilinear<4>(r_ptr, w_ptr, width, height, p_width, p_height); break;
+ switch (get_format_pixel_size(format)) {
+ case 1: _scale_bilinear<1>(src_ptr, w_ptr, src_width, src_height, p_width, p_height); break;
+ case 2: _scale_bilinear<2>(src_ptr, w_ptr, src_width, src_height, p_width, p_height); break;
+ case 3: _scale_bilinear<3>(src_ptr, w_ptr, src_width, src_height, p_width, p_height); break;
+ case 4: _scale_bilinear<4>(src_ptr, w_ptr, src_width, src_height, p_width, p_height); break;
+ }
+ }
+
+ if (interpolate_mipmaps) {
+ // Switch to read again from the first scaled mipmap to overlay it over the second
+ r = dst.data.read();
+ _overlay(r.ptr(), w.ptr(), mip1_weight, p_width, p_height, get_format_pixel_size(format));
}
} break;
@@ -759,7 +842,11 @@ void Image::resize(int p_width, int p_height, Interpolation p_interpolation) {
r = PoolVector<uint8_t>::Read();
w = PoolVector<uint8_t>::Write();
- if (mipmaps > 0)
+ if (interpolate_mipmaps) {
+ dst._copy_internals_from(dst2);
+ }
+
+ if (had_mipmaps)
dst.generate_mipmaps();
_copy_internals_from(dst);
@@ -2404,6 +2491,7 @@ void Image::_bind_methods() {
BIND_ENUM_CONSTANT(INTERPOLATE_NEAREST);
BIND_ENUM_CONSTANT(INTERPOLATE_BILINEAR);
BIND_ENUM_CONSTANT(INTERPOLATE_CUBIC);
+ BIND_ENUM_CONSTANT(INTERPOLATE_TRILINEAR);
BIND_ENUM_CONSTANT(ALPHA_NONE);
BIND_ENUM_CONSTANT(ALPHA_BIT);
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-31 04:08:30 +0000