105 lines
4.1 KiB
C
105 lines
4.1 KiB
C
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#include <jni.h>
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#include <stdio.h>
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#include <setjmp.h>
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#include <android/bitmap.h>
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#include <libjpeg/jpeglib.h>
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#include "utils.h"
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typedef struct my_error_mgr {
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struct jpeg_error_mgr pub;
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jmp_buf setjmp_buffer;
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} *my_error_ptr;
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METHODDEF(void) my_error_exit(j_common_ptr cinfo) {
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my_error_ptr myerr = (my_error_ptr) cinfo->err;
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(*cinfo->err->output_message) (cinfo);
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longjmp(myerr->setjmp_buffer, 1);
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}
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JNIEXPORT void Java_org_telegram_messenger_Utilities_loadBitmap(JNIEnv *env, jclass class, jstring path, jobject bitmap, int scale) {
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AndroidBitmapInfo info;
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int i;
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if ((i = AndroidBitmap_getInfo(env, bitmap, &info)) >= 0) {
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char *fileName = (*env)->GetStringUTFChars(env, path, NULL);
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FILE *infile;
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if ((infile = fopen(fileName, "rb"))) {
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struct my_error_mgr jerr;
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struct jpeg_decompress_struct cinfo;
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cinfo.err = jpeg_std_error(&jerr.pub);
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jerr.pub.error_exit = my_error_exit;
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if (!setjmp(jerr.setjmp_buffer)) {
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jpeg_create_decompress(&cinfo);
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jpeg_stdio_src(&cinfo, infile);
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jpeg_read_header(&cinfo, TRUE);
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cinfo.scale_denom = scale;
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cinfo.scale_num = 1;
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jpeg_start_decompress(&cinfo);
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int row_stride = cinfo.output_width * cinfo.output_components;
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JSAMPARRAY buffer = (*cinfo.mem->alloc_sarray) ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
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unsigned char *pixels;
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if ((i = AndroidBitmap_lockPixels(env, bitmap, &pixels)) >= 0) {
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int rowCount = min(cinfo.output_height, info.height);
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int colCount = min(cinfo.output_width, info.width);
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while (cinfo.output_scanline < rowCount) {
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jpeg_read_scanlines(&cinfo, buffer, 1);
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if (info.format == ANDROID_BITMAP_FORMAT_RGBA_8888) {
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if (cinfo.out_color_space == JCS_GRAYSCALE) {
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for (i = 0; i < colCount; i++) {
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float alpha = buffer[0][i] / 255.0f;
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pixels[i * 4] *= alpha;
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pixels[i * 4 + 1] *= alpha;
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pixels[i * 4 + 2] *= alpha;
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pixels[i * 4 + 3] = buffer[0][i];
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}
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} else {
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int c = 0;
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for (i = 0; i < colCount; i++) {
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pixels[i * 4] = buffer[0][i * 3];
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pixels[i * 4 + 1] = buffer[0][i * 3 + 1];
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pixels[i * 4 + 2] = buffer[0][i * 3 + 2];
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pixels[i * 4 + 3] = 255;
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c += 4;
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}
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}
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} else if (info.format == ANDROID_BITMAP_FORMAT_RGB_565) {
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}
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pixels += info.stride;
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}
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AndroidBitmap_unlockPixels(env, bitmap);
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} else {
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throwException(env, "AndroidBitmap_lockPixels() failed ! error=%d", i);
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}
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jpeg_finish_decompress(&cinfo);
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} else {
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throwException(env, "the JPEG code has signaled an error");
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}
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jpeg_destroy_decompress(&cinfo);
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fclose(infile);
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} else {
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throwException(env, "can't open %s\n", fileName);
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}
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(*env)->ReleaseStringUTFChars(env, path, fileName);
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} else {
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throwException(env, "AndroidBitmap_getInfo() failed ! error=%d", i);
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}
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}
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