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NekoX/TMessagesProj/jni/image.c

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#include <jni.h>
#include <stdio.h>
#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <android/bitmap.h>
#include <libwebp/webp/decode.h>
#include <libwebp/webp/encode.h>
#include <malloc.h>
#include "c_utils.h"
#include "image.h"
jclass jclass_NullPointerException;
jclass jclass_RuntimeException;
jclass jclass_Options;
jfieldID jclass_Options_inJustDecodeBounds;
jfieldID jclass_Options_outHeight;
jfieldID jclass_Options_outWidth;
const uint32_t PGPhotoEnhanceHistogramBins = 256;
const uint32_t PGPhotoEnhanceSegments = 4;
jclass createGlobarRef(JNIEnv *env, jclass class) {
if (class) {
return (*env)->NewGlobalRef(env, class);
}
return 0;
}
jint imageOnJNILoad(JavaVM *vm, JNIEnv *env) {
jclass_NullPointerException = createGlobarRef(env, (*env)->FindClass(env, "java/lang/NullPointerException"));
if (jclass_NullPointerException == 0) {
return JNI_FALSE;
}
jclass_RuntimeException = createGlobarRef(env, (*env)->FindClass(env, "java/lang/RuntimeException"));
if (jclass_RuntimeException == 0) {
return JNI_FALSE;
}
jclass_Options = createGlobarRef(env, (*env)->FindClass(env, "android/graphics/BitmapFactory$Options"));
if (jclass_Options == 0) {
return JNI_FALSE;
}
jclass_Options_inJustDecodeBounds = (*env)->GetFieldID(env, jclass_Options, "inJustDecodeBounds", "Z");
if (jclass_Options_inJustDecodeBounds == 0) {
return JNI_FALSE;
}
jclass_Options_outHeight = (*env)->GetFieldID(env, jclass_Options, "outHeight", "I");
if (jclass_Options_outHeight == 0) {
return JNI_FALSE;
}
jclass_Options_outWidth = (*env)->GetFieldID(env, jclass_Options, "outWidth", "I");
if (jclass_Options_outWidth == 0) {
return JNI_FALSE;
}
return JNI_TRUE;
}
static inline uint64_t getColors(const uint8_t *p) {
return p[0] + (p[1] << 16) + ((uint64_t) p[2] << 32) + ((uint64_t) p[3] << 48);
}
static inline uint64_t getColors565(const uint8_t *p) {
uint16_t *ps = (uint16_t *) p;
return ((((ps[0] & 0xF800) >> 11) * 255) / 31) + (((((ps[0] & 0x07E0) >> 5) * 255) / 63) << 16) + ((uint64_t) (((ps[0] & 0x001F) * 255) / 31) << 32);
}
static void fastBlurMore(int32_t w, int32_t h, int32_t stride, uint8_t *pix, int32_t radius) {
const int32_t r1 = radius + 1;
const int32_t div = radius * 2 + 1;
if (radius > 15 || div >= w || div >= h || w * h > 150 * 150 || stride > w * 4) {
return;
}
uint64_t *rgb = malloc(w * h * sizeof(uint64_t));
if (rgb == NULL) {
return;
}
int32_t x, y, i;
int32_t yw = 0;
const int32_t we = w - r1;
for (y = 0; y < h; y++) {
uint64_t cur = getColors(&pix[yw]);
uint64_t rgballsum = -radius * cur;
uint64_t rgbsum = cur * ((r1 * (r1 + 1)) >> 1);
for (i = 1; i <= radius; i++) {
cur = getColors(&pix[yw + i * 4]);
rgbsum += cur * (r1 - i);
rgballsum += cur;
}
x = 0;
#define update(start, middle, end) \
rgb[y * w + x] = (rgbsum >> 6) & 0x00FF00FF00FF00FF; \
rgballsum += getColors(&pix[yw + (start) * 4]) - 2 * getColors(&pix[yw + (middle) * 4]) + getColors(&pix[yw + (end) * 4]); \
rgbsum += rgballsum; \
x++; \
while (x < r1) {
update (0, x, x + r1);
}
while (x < we) {
update (x - r1, x, x + r1);
}
while (x < w) {
update (x - r1, x, w - 1);
}
#undef update
yw += stride;
}
const int32_t he = h - r1;
for (x = 0; x < w; x++) {
uint64_t rgballsum = -radius * rgb[x];
uint64_t rgbsum = rgb[x] * ((r1 * (r1 + 1)) >> 1);
for (i = 1; i <= radius; i++) {
rgbsum += rgb[i * w + x] * (r1 - i);
rgballsum += rgb[i * w + x];
}
y = 0;
int32_t yi = x * 4;
#define update(start, middle, end) \
int64_t res = rgbsum >> 6; \
pix[yi] = res; \
pix[yi + 1] = res >> 16; \
pix[yi + 2] = res >> 32; \
pix[yi + 3] = res >> 48; \
rgballsum += rgb[x + (start) * w] - 2 * rgb[x + (middle) * w] + rgb[x + (end) * w]; \
rgbsum += rgballsum; \
y++; \
yi += stride;
while (y < r1) {
update (0, y, y + r1);
}
while (y < he) {
update (y - r1, y, y + r1);
}
while (y < h) {
update (y - r1, y, h - 1);
}
#undef update
}
}
static void fastBlur(int32_t w, int32_t h, int32_t stride, uint8_t *pix, int32_t radius) {
if (pix == NULL) {
return;
}
const int32_t r1 = radius + 1;
const int32_t div = radius * 2 + 1;
int32_t shift;
if (radius == 1) {
shift = 2;
} else if (radius == 3) {
shift = 4;
} else if (radius == 7) {
shift = 6;
} else if (radius == 15) {
shift = 8;
} else {
return;
}
if (radius > 15 || div >= w || div >= h || w * h > 150 * 150 || stride > w * 4) {
return;
}
uint64_t *rgb = malloc(w * h * sizeof(uint64_t));
if (rgb == NULL) {
return;
}
int32_t x, y, i;
int32_t yw = 0;
const int32_t we = w - r1;
for (y = 0; y < h; y++) {
uint64_t cur = getColors(&pix[yw]);
uint64_t rgballsum = -radius * cur;
uint64_t rgbsum = cur * ((r1 * (r1 + 1)) >> 1);
for (i = 1; i <= radius; i++) {
cur = getColors(&pix[yw + i * 4]);
rgbsum += cur * (r1 - i);
rgballsum += cur;
}
x = 0;
#define update(start, middle, end) \
rgb[y * w + x] = (rgbsum >> shift) & 0x00FF00FF00FF00FFLL; \
rgballsum += getColors(&pix[yw + (start) * 4]) - 2 * getColors(&pix[yw + (middle) * 4]) + getColors(&pix[yw + (end) * 4]); \
rgbsum += rgballsum; \
x++; \
while (x < r1) {
update (0, x, x + r1);
}
while (x < we) {
update (x - r1, x, x + r1);
}
while (x < w) {
update (x - r1, x, w - 1);
}
#undef update
yw += stride;
}
const int32_t he = h - r1;
for (x = 0; x < w; x++) {
uint64_t rgballsum = -radius * rgb[x];
uint64_t rgbsum = rgb[x] * ((r1 * (r1 + 1)) >> 1);
for (i = 1; i <= radius; i++) {
rgbsum += rgb[i * w + x] * (r1 - i);
rgballsum += rgb[i * w + x];
}
y = 0;
int32_t yi = x * 4;
#define update(start, middle, end) \
int64_t res = rgbsum >> shift; \
pix[yi] = res; \
pix[yi + 1] = res >> 16; \
pix[yi + 2] = res >> 32; \
pix[yi + 3] = res >> 48; \
rgballsum += rgb[x + (start) * w] - 2 * rgb[x + (middle) * w] + rgb[x + (end) * w]; \
rgbsum += rgballsum; \
y++; \
yi += stride;
while (y < r1) {
update (0, y, y + r1);
}
while (y < he) {
update (y - r1, y, y + r1);
}
while (y < h) {
update (y - r1, y, h - 1);
}
#undef update
}
free(rgb);
}
static void fastBlurMore565(int32_t w, int32_t h, int32_t stride, uint8_t *pix, int32_t radius) {
const int32_t r1 = radius + 1;
const int32_t div = radius * 2 + 1;
if (radius > 15 || div >= w || div >= h || w * h > 150 * 150 || stride > w * 2) {
return;
}
uint64_t *rgb = malloc(w * h * sizeof(uint64_t));
if (rgb == NULL) {
return;
}
int32_t x, y, i;
int32_t yw = 0;
const int32_t we = w - r1;
for (y = 0; y < h; y++) {
uint64_t cur = getColors565(&pix[yw]);
uint64_t rgballsum = -radius * cur;
uint64_t rgbsum = cur * ((r1 * (r1 + 1)) >> 1);
for (i = 1; i <= radius; i++) {
cur = getColors565(&pix[yw + i * 2]);
rgbsum += cur * (r1 - i);
rgballsum += cur;
}
x = 0;
#define update(start, middle, end) \
rgb[y * w + x] = (rgbsum >> 6) & 0x00FF00FF00FF00FF; \
rgballsum += getColors565(&pix[yw + (start) * 2]) - 2 * getColors565(&pix[yw + (middle) * 2]) + getColors565(&pix[yw + (end) * 2]); \
rgbsum += rgballsum; \
x++; \
while (x < r1) {
update (0, x, x + r1);
}
while (x < we) {
update (x - r1, x, x + r1);
}
while (x < w) {
update (x - r1, x, w - 1);
}
#undef update
yw += stride;
}
const int32_t he = h - r1;
for (x = 0; x < w; x++) {
uint64_t rgballsum = -radius * rgb[x];
uint64_t rgbsum = rgb[x] * ((r1 * (r1 + 1)) >> 1);
for (i = 1; i <= radius; i++) {
rgbsum += rgb[i * w + x] * (r1 - i);
rgballsum += rgb[i * w + x];
}
y = 0;
int32_t yi = x * 2;
#define update(start, middle, end) \
int64_t res = rgbsum >> 6; \
pix[yi] = ((res >> 13) & 0xe0) | ((res >> 35) & 0x1f); \
pix[yi + 1] = (res & 0xf8) | ((res >> 21) & 0x7); \
rgballsum += rgb[x + (start) * w] - 2 * rgb[x + (middle) * w] + rgb[x + (end) * w]; \
rgbsum += rgballsum; \
y++; \
yi += stride;
while (y < r1) {
update (0, y, y + r1);
}
while (y < he) {
update (y - r1, y, y + r1);
}
while (y < h) {
update (y - r1, y, h - 1);
}
#undef update
}
}
static void fastBlur565(int32_t w, int32_t h, int32_t stride, uint8_t *pix, int32_t radius) {
if (pix == NULL) {
return;
}
const int32_t r1 = radius + 1;
const int32_t div = radius * 2 + 1;
int32_t shift;
if (radius == 1) {
shift = 2;
} else if (radius == 3) {
shift = 4;
} else if (radius == 7) {
shift = 6;
} else if (radius == 15) {
shift = 8;
} else {
return;
}
if (radius > 15 || div >= w || div >= h || w * h > 150 * 150 || stride > w * 2) {
return;
}
uint64_t *rgb = malloc(w * h * sizeof(uint64_t));
if (rgb == NULL) {
return;
}
int32_t x, y, i;
int32_t yw = 0;
const int32_t we = w - r1;
for (y = 0; y < h; y++) {
uint64_t cur = getColors565(&pix[yw]);
uint64_t rgballsum = -radius * cur;
uint64_t rgbsum = cur * ((r1 * (r1 + 1)) >> 1);
for (i = 1; i <= radius; i++) {
cur = getColors565(&pix[yw + i * 2]);
rgbsum += cur * (r1 - i);
rgballsum += cur;
}
x = 0;
#define update(start, middle, end) \
rgb[y * w + x] = (rgbsum >> shift) & 0x00FF00FF00FF00FFLL; \
rgballsum += getColors565(&pix[yw + (start) * 2]) - 2 * getColors565(&pix[yw + (middle) * 2]) + getColors565(&pix[yw + (end) * 2]); \
rgbsum += rgballsum; \
x++;
while (x < r1) {
update(0, x, x + r1);
}
while (x < we) {
update(x - r1, x, x + r1);
}
while (x < w) {
update(x - r1, x, w - 1);
}
#undef update
yw += stride;
}
const int32_t he = h - r1;
for (x = 0; x < w; x++) {
uint64_t rgballsum = -radius * rgb[x];
uint64_t rgbsum = rgb[x] * ((r1 * (r1 + 1)) >> 1);
for (i = 1; i <= radius; i++) {
rgbsum += rgb[i * w + x] * (r1 - i);
rgballsum += rgb[i * w + x];
}
y = 0;
int32_t yi = x * 2;
#define update(start, middle, end) \
uint64_t res = rgbsum >> shift; \
pix[yi] = ((res >> 13) & 0xe0) | ((res >> 35) & 0x1f); \
pix[yi + 1] = (res & 0xf8) | ((res >> 21) & 0x7); \
rgballsum += rgb[x + (start) * w] - 2 * rgb[x + (middle) * w] + rgb[x + (end) * w]; \
rgbsum += rgballsum; \
y++; \
yi += stride;
while (y < r1) {
update (0, y, y + r1);
}
while (y < he) {
update (y - r1, y, y + r1);
}
while (y < h) {
update (y - r1, y, h - 1);
}
#undef update
}
free(rgb);
}
JNIEXPORT int Java_org_telegram_messenger_Utilities_needInvert(JNIEnv *env, jclass class, jobject bitmap, jint unpin, jint width, jint height, jint stride) {
if (!bitmap) {
return 0;
}
if (!width || !height || !stride || stride != width * 4 || width * height > 150 * 150) {
return 0;
}
void *pixels = 0;
if (AndroidBitmap_lockPixels(env, bitmap, &pixels) < 0) {
return 0;
}
if (pixels == NULL) {
return 0;
}
uint8_t *pix = (uint8_t *) pixels;
int32_t hasAlpha = 0;
float matching = 0;
float total = 0;
for (int32_t y = 0; y < height; y++) {
for (int32_t x = 0; x < width; x++) {
int32_t index = y * stride + x * 4;
uint8_t a = pix[index + 3];
float alpha = a / 255.0f;
uint8_t r = (uint8_t) (pix[index] * alpha);
uint8_t g = (uint8_t) (pix[index + 1] * alpha);
uint8_t b = (uint8_t) (pix[index + 2] * alpha);
uint8_t cmax = (r > g) ? r : g;
if (b > cmax) {
cmax = b;
}
uint8_t cmin = (r < g) ? r : g;
if (b < cmin) {
cmin = b;
}
float saturation;
float brightness = ((float) cmax) / 255.0f;
if (cmax != 0) {
saturation = ((float) (cmax - cmin)) / ((float) cmax);
} else {
saturation = 0;
}
if (alpha < 1.0) {
hasAlpha = 1;
}
if (alpha > 0.0) {
total += 1;
if (saturation < 0.1f && brightness < 0.25f) {
matching += 1;
}
}
}
}
if (unpin) {
AndroidBitmap_unlockPixels(env, bitmap);
}
return hasAlpha && matching / total > 0.85;
}
JNIEXPORT void Java_org_telegram_messenger_Utilities_blurBitmap(JNIEnv *env, jclass class, jobject bitmap, jint radius, jint unpin, jint width, jint height, jint stride) {
if (!bitmap) {
return;
}
if (!width || !height || !stride) {
return;
}
void *pixels = 0;
if (AndroidBitmap_lockPixels(env, bitmap, &pixels) < 0) {
return;
}
if (stride == width * 2) {
if (radius <= 3) {
fastBlur565(width, height, stride, pixels, radius);
} else {
fastBlurMore565(width, height, stride, pixels, radius);
}
} else {
if (radius <= 3) {
fastBlur(width, height, stride, pixels, radius);
} else {
fastBlurMore(width, height, stride, pixels, radius);
}
}
if (unpin) {
AndroidBitmap_unlockPixels(env, bitmap);
}
}
JNIEXPORT void Java_org_telegram_messenger_Utilities_calcCDT(JNIEnv *env, jclass class, jobject hsvBuffer, jint width, jint height, jobject buffer) {
float imageWidth = width;
float imageHeight = height;
float _clipLimit = 1.25f;
uint32_t totalSegments = PGPhotoEnhanceSegments * PGPhotoEnhanceSegments;
uint32_t tileArea = (uint32_t) (floorf(imageWidth / PGPhotoEnhanceSegments) * floorf(imageHeight / PGPhotoEnhanceSegments));
uint32_t clipLimit = (uint32_t) MAX(1, _clipLimit * tileArea / (float) PGPhotoEnhanceHistogramBins);
float scale = 255.0f / (float) tileArea;
unsigned char *bytes = (*env)->GetDirectBufferAddress(env, hsvBuffer);
uint32_t **hist = calloc(totalSegments, sizeof(uint32_t *));
uint32_t **cdfs = calloc(totalSegments, sizeof(uint32_t *));
uint32_t *cdfsMin = calloc(totalSegments, sizeof(uint32_t));
uint32_t *cdfsMax = calloc(totalSegments, sizeof(uint32_t));
for (uint32_t a = 0; a < totalSegments; a++) {
hist[a] = calloc(PGPhotoEnhanceHistogramBins, sizeof(uint32_t));
cdfs[a] = calloc(PGPhotoEnhanceHistogramBins, sizeof(uint32_t));
}
float xMul = PGPhotoEnhanceSegments / imageWidth;
float yMul = PGPhotoEnhanceSegments / imageHeight;
for (uint32_t y = 0; y < imageHeight; y++) {
uint32_t yOffset = y * width * 4;
for (uint32_t x = 0; x < imageWidth; x++) {
uint32_t index = x * 4 + yOffset;
uint32_t tx = (uint32_t)(x * xMul);
uint32_t ty = (uint32_t)(y * yMul);
uint32_t t = ty * PGPhotoEnhanceSegments + tx;
hist[t][bytes[index + 2]]++;
}
}
for (uint32_t i = 0; i < totalSegments; i++) {
if (clipLimit > 0) {
uint32_t clipped = 0;
for (uint32_t j = 0; j < PGPhotoEnhanceHistogramBins; ++j) {
if (hist[i][j] > clipLimit) {
clipped += hist[i][j] - clipLimit;
hist[i][j] = clipLimit;
}
}
uint32_t redistBatch = clipped / PGPhotoEnhanceHistogramBins;
uint32_t residual = clipped - redistBatch * PGPhotoEnhanceHistogramBins;
for (uint32_t j = 0; j < PGPhotoEnhanceHistogramBins; ++j) {
hist[i][j] += redistBatch;
}
for (uint32_t j = 0; j < residual; ++j) {
hist[i][j]++;
}
}
memcpy(cdfs[i], hist[i], PGPhotoEnhanceHistogramBins * sizeof(uint32_t));
uint32_t hMin = PGPhotoEnhanceHistogramBins - 1;
for (uint32_t j = 0; j < hMin; ++j) {
if (cdfs[j] != 0) {
hMin = j;
}
}
uint32_t cdf = 0;
for (uint32_t j = hMin; j < PGPhotoEnhanceHistogramBins; ++j) {
cdf += cdfs[i][j];
cdfs[i][j] = (uint8_t) MIN(255, cdf * scale);
}
cdfsMin[i] = cdfs[i][hMin];
cdfsMax[i] = cdfs[i][PGPhotoEnhanceHistogramBins - 1];
}
uint32_t resultSize = 4 * PGPhotoEnhanceHistogramBins * totalSegments;
uint32_t resultBytesPerRow = 4 * PGPhotoEnhanceHistogramBins;
unsigned char *result = (*env)->GetDirectBufferAddress(env, buffer);
for (uint32_t tile = 0; tile < totalSegments; tile++) {
uint32_t yOffset = tile * resultBytesPerRow;
for (uint32_t i = 0; i < PGPhotoEnhanceHistogramBins; i++) {
uint32_t index = i * 4 + yOffset;
result[index] = (uint8_t)cdfs[tile][i];
result[index + 1] = (uint8_t)cdfsMin[tile];
result[index + 2] = (uint8_t)cdfsMax[tile];
result[index + 3] = 255;
}
}
for (uint32_t a = 0; a < totalSegments; a++) {
free(hist[a]);
free(cdfs[a]);
}
free(hist);
free(cdfs);
free(cdfsMax);
free(cdfsMin);
}
JNIEXPORT jint Java_org_telegram_messenger_Utilities_pinBitmap(JNIEnv *env, jclass class, jobject bitmap) {
if (bitmap == NULL) {
return 0;
}
unsigned char *pixels;
return AndroidBitmap_lockPixels(env, bitmap, &pixels) >= 0 ? 1 : 0;
}
JNIEXPORT void Java_org_telegram_messenger_Utilities_unpinBitmap(JNIEnv *env, jclass class, jobject bitmap) {
if (bitmap == NULL) {
return;
}
AndroidBitmap_unlockPixels(env, bitmap);
}
JNIEXPORT jboolean Java_org_telegram_messenger_Utilities_loadWebpImage(JNIEnv *env, jclass class, jobject outputBitmap, jobject buffer, jint len, jobject options, jboolean unpin) {
if (!buffer) {
(*env)->ThrowNew(env, jclass_NullPointerException, "Input buffer can not be null");
return 0;
}
jbyte *inputBuffer = (*env)->GetDirectBufferAddress(env, buffer);
int32_t bitmapWidth = 0;
int32_t bitmapHeight = 0;
if (!WebPGetInfo((uint8_t*)inputBuffer, len, &bitmapWidth, &bitmapHeight)) {
(*env)->ThrowNew(env, jclass_RuntimeException, "Invalid WebP format");
return 0;
}
if (options && (*env)->GetBooleanField(env, options, jclass_Options_inJustDecodeBounds) == JNI_TRUE) {
(*env)->SetIntField(env, options, jclass_Options_outWidth, bitmapWidth);
(*env)->SetIntField(env, options, jclass_Options_outHeight, bitmapHeight);
return 1;
}
if (!outputBitmap) {
(*env)->ThrowNew(env, jclass_NullPointerException, "output bitmap can not be null");
return 0;
}
AndroidBitmapInfo bitmapInfo;
if (AndroidBitmap_getInfo(env, outputBitmap, &bitmapInfo) != ANDROID_BITMAP_RESUT_SUCCESS) {
(*env)->ThrowNew(env, jclass_RuntimeException, "Failed to get Bitmap information");
return 0;
}
void *bitmapPixels = 0;
if (AndroidBitmap_lockPixels(env, outputBitmap, &bitmapPixels) != ANDROID_BITMAP_RESUT_SUCCESS) {
(*env)->ThrowNew(env, jclass_RuntimeException, "Failed to lock Bitmap pixels");
return 0;
}
if (!WebPDecodeRGBAInto((uint8_t*)inputBuffer, len, (uint8_t*)bitmapPixels, bitmapInfo.height * bitmapInfo.stride, bitmapInfo.stride)) {
AndroidBitmap_unlockPixels(env, outputBitmap);
(*env)->ThrowNew(env, jclass_RuntimeException, "Failed to decode webp image");
return 0;
}
if (unpin && AndroidBitmap_unlockPixels(env, outputBitmap) != ANDROID_BITMAP_RESUT_SUCCESS) {
(*env)->ThrowNew(env, jclass_RuntimeException, "Failed to unlock Bitmap pixels");
return 0;
}
return 1;
}
#define SQUARE(i) ((i)*(i))
inline static void zeroClearInt(int* p, size_t count) { memset(p, 0, sizeof(int) * count); }
JNIEXPORT void Java_org_telegram_messenger_Utilities_stackBlurBitmap(JNIEnv* env, jclass class, jobject bitmap, jint radius) {
if (radius < 1) return;
AndroidBitmapInfo info;
if (AndroidBitmap_getInfo(env, bitmap, &info) != ANDROID_BITMAP_RESULT_SUCCESS)
return;
if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888)
return;
int w = info.width;
int h = info.height;
int stride = info.stride;
unsigned char *pixels = 0;
AndroidBitmap_lockPixels(env, bitmap, (void **) &pixels);
if (!pixels) {
return;
}
// Constants
//const int radius = (int)inradius; // Transform unsigned into signed for further operations
const int wm = w - 1;
const int hm = h - 1;
const int wh = w * h;
const int div = radius + radius + 1;
const int r1 = radius + 1;
const int divsum = SQUARE((div + 1) >> 1);
// Small buffers
int stack[div * 3];
zeroClearInt(stack, div * 3);
int vmin[MAX(w, h)];
zeroClearInt(vmin, MAX(w, h));
// Large buffers
int *r = malloc(wh * sizeof(int));
int *g = malloc(wh * sizeof(int));
int *b = malloc(wh * sizeof(int));
zeroClearInt(r, wh);
zeroClearInt(g, wh);
zeroClearInt(b, wh);
const size_t dvcount = 256 * divsum;
int *dv = malloc(sizeof(int) * dvcount);
int i;
for (i = 0; (size_t) i < dvcount; i++) {
dv[i] = (i / divsum);
}
// Variables
int x, y;
int *sir;
int routsum, goutsum, boutsum;
int rinsum, ginsum, binsum;
int rsum, gsum, bsum, p, yp;
int stackpointer;
int stackstart;
int rbs;
int yw = 0, yi = 0;
for (y = 0; y < h; y++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
for (i = -radius; i <= radius; i++) {
sir = &stack[(i + radius) * 3];
int offset = (y * stride + (MIN(wm, MAX(i, 0))) * 4);
sir[0] = pixels[offset];
sir[1] = pixels[offset + 1];
sir[2] = pixels[offset + 2];
rbs = r1 - abs(i);
rsum += sir[0] * rbs;
gsum += sir[1] * rbs;
bsum += sir[2] * rbs;
if (i > 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
}
stackpointer = radius;
for (x = 0; x < w; x++) {
r[yi] = dv[rsum];
g[yi] = dv[gsum];
b[yi] = dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer - radius + div;
sir = &stack[(stackstart % div) * 3];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (y == 0) {
vmin[x] = MIN(x + radius + 1, wm);
}
int offset = (y * stride + vmin[x] * 4);
sir[0] = pixels[offset];
sir[1] = pixels[offset + 1];
sir[2] = pixels[offset + 2];
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = &stack[(stackpointer % div) * 3];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi++;
}
yw += w;
}
for (x = 0; x < w; x++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
yp = -radius * w;
for (i = -radius; i <= radius; i++) {
yi = MAX(0, yp) + x;
sir = &stack[(i + radius) * 3];
sir[0] = r[yi];
sir[1] = g[yi];
sir[2] = b[yi];
rbs = r1 - abs(i);
rsum += r[yi] * rbs;
gsum += g[yi] * rbs;
bsum += b[yi] * rbs;
if (i > 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
if (i < hm) {
yp += w;
}
}
stackpointer = radius;
for (y = 0; y < h; y++) {
int offset = stride * y + x * 4;
pixels[offset] = dv[rsum];
pixels[offset + 1] = dv[gsum];
pixels[offset + 2] = dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer - radius + div;
sir = &stack[(stackstart % div) * 3];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (x == 0) {
vmin[y] = (MIN(y + r1, hm)) * w;
}
p = x + vmin[y];
sir[0] = r[p];
sir[1] = g[p];
sir[2] = b[p];
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = &stack[stackpointer * 3];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi += w;
}
}
free(r);
free(g);
free(b);
free(dv);
AndroidBitmap_unlockPixels(env, bitmap);
}
JNIEXPORT void Java_org_telegram_messenger_Utilities_drawDitheredGradient(JNIEnv* env, jclass class, jobject bitmap, jintArray colors, jint startX, jint startY, jint endX, jint endY) {
AndroidBitmapInfo info;
void* pixelsBuffer;
int reason;
if ((reason = AndroidBitmap_getInfo(env, bitmap, &info)) != ANDROID_BITMAP_RESULT_SUCCESS) {
(*env)->ThrowNew(env, jclass_RuntimeException, "AndroidBitmap_getInfo failed with a reason: " + reason);
return;
}
if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888) {
(*env)->ThrowNew(env, jclass_RuntimeException, "Bitmap must be in ARGB_8888 format");
return;
}
if ((reason = AndroidBitmap_lockPixels(env, bitmap, &pixelsBuffer)) != ANDROID_BITMAP_RESULT_SUCCESS) {
(*env)->ThrowNew(env, jclass_RuntimeException, "AndroidBitmap_lockPixels failed with a reason: " + reason);
return;
}
uint8_t i, j, n;
// gradient colors extracting
jint *colorsBuffer = (*env)->GetIntArrayElements(env, colors, 0);
uint8_t *colorsComponents = (uint8_t *) colorsBuffer;
float colorsF[4][2];
for (i = 0; i < 4; i++) {
// swap red and green channels
n = (uint8_t) (i == 0 ? 2 : (i == 2 ? 0 : i));
for (j = 0; j < 2; j++) {
colorsF[n][j] = colorsComponents[j * 4 + i] / 255.F;
}
}
(*env)->ReleaseIntArrayElements(env, colors, colorsBuffer, JNI_ABORT);
// gradient vector
const int32_t vx = endX - startX;
const int32_t vy = endY - startY;
const float vSquaredMag = vx * vx + vy * vy;
float noise, fraction, error, componentF;
float *pixelsComponentsF = malloc(info.height * info.stride * 4 * sizeof(float));
memset(pixelsComponentsF, 0, info.height * info.stride * 4 * sizeof(float));
uint8_t *bitmapPixelsComponents = (uint8_t *) pixelsBuffer;
int32_t x, y;
int32_t offset;
int32_t position;
for (y = 0; y < info.height; y++) {
offset = y * info.stride;
for (x = 0; x < info.width; x++) {
// triangular probability density function dither noise
noise = (rand() - rand()) / 255.F / RAND_MAX;
// alpha channel
bitmapPixelsComponents[offset + x * 4 + 3] = 255;
for (i = 0; i < 3; i++) {
position = offset + x * 4 + i;
fraction = (vx * (x - startX) + vy * (y - startY)) / vSquaredMag;
// gradient interpolation and noise
pixelsComponentsF[position] += colorsF[i][0] + fraction * (colorsF[i][1] - colorsF[i][0]) + noise;
// clamp
if (pixelsComponentsF[position] > 1.F) {
pixelsComponentsF[position] = 1.F;
} else if (pixelsComponentsF[position] < 0.F) {
pixelsComponentsF[position] = 0.F;
}
// draw
componentF = roundf(pixelsComponentsF[position] * 255.F);
bitmapPixelsComponents[position] = (uint8_t) componentF;
// floyd-steinberg dithering
error = pixelsComponentsF[position] - componentF / 255.F;
if (x + 1 < info.width) {
pixelsComponentsF[position + 4] += error * 7.F / 16.F;
if (y + 1 < info.height) {
pixelsComponentsF[position + info.height + 4] += error * 1.F / 16.F;
}
}
if (y + 1 < info.height) {
pixelsComponentsF[position + info.height] += error * 5.F / 16.F;
if (x - 1 >= 0) {
pixelsComponentsF[position + info.height - 4] += error * 3.F / 16.F;
}
}
}
}
}
free(pixelsComponentsF);
if ((reason = AndroidBitmap_unlockPixels(env, bitmap)) != ANDROID_BITMAP_RESULT_SUCCESS) {
(*env)->ThrowNew(env, jclass_RuntimeException, "AndroidBitmap_unlockPixels failed with a reason: " + reason);
return;
}
}
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