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add pvrtc1 4bpp support

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This commit is contained in:
Ishotihadus
2019-12-12 03:13:20 +09:00
parent aa29a229ea
commit 89347bbdbe
4 changed files with 287 additions and 4 deletions
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ext/decoders/native/main.c
+26
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@@ -1,6 +1,7 @@
#include "astc.h"
#include "dxtc.h"
#include "etc.h"
#include "pvrtc.h"
#include "rgb.h"
#include <ruby.h>
#include <stdint.h>
@@ -212,6 +213,30 @@ static VALUE rb_decode_dxt5(VALUE self, VALUE rb_data, VALUE w, VALUE h)
return ret;
}
/*
* Decode image from PVRTC1 4bpp compressed binary
*
* @param [String] rb_data binary to decode
* @param [Integer] w image width
* @param [Integer] h image height
* @return [String] decoded rgba binary
*/
static VALUE rb_decode_pvrtc1_4bpp(VALUE self, VALUE rb_data, VALUE w, VALUE h)
{
if (RSTRING_LEN(rb_data) < ((FIX2LONG(w) + 3) / 4) * ((FIX2LONG(h) + 3) / 4) * 8) {
rb_raise(rb_eStandardError, "Data size is not enough.");
return Qnil;
}
size_t buffer_length = FIX2LONG(w) * FIX2LONG(h) * 8;
VALUE ret = rb_str_buf_new(buffer_length);
if (!decode_pvrtc_4bpp((uint8_t*)RSTRING_PTR(rb_data), FIX2INT(w), FIX2INT(h), (uint32_t*)RSTRING_PTR(ret))) {
rb_raise(rb_eStandardError, "internal error");
return Qnil;
}
rb_str_set_len(ret, buffer_length);
return ret;
}
void Init_native()
{
VALUE mMikunyan = rb_define_module("Mikunyan");
@@ -227,4 +252,5 @@ void Init_native()
rb_define_module_function(mDecodeHelper, "decode_astc", rb_decode_astc, 5);
rb_define_module_function(mDecodeHelper, "decode_dxt1", rb_decode_dxt1, 3);
rb_define_module_function(mDecodeHelper, "decode_dxt5", rb_decode_dxt5, 3);
rb_define_module_function(mDecodeHelper, "decode_pvrtc1_4bpp", rb_decode_pvrtc1_4bpp, 3);
}