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-rw-r--r--jidctred.c87
1 files changed, 44 insertions, 43 deletions
diff --git a/jidctred.c b/jidctred.c
index 4598698f..7a81803b 100644
--- a/jidctred.c
+++ b/jidctred.c
@@ -4,8 +4,9 @@
* This file was part of the Independent JPEG Group's software.
* Copyright (C) 1994-1998, Thomas G. Lane.
* libjpeg-turbo Modifications:
- * Copyright (C) 2015, D. R. Commander
- * For conditions of distribution and use, see the accompanying README file.
+ * Copyright (C) 2015, D. R. Commander.
+ * For conditions of distribution and use, see the accompanying README.ijg
+ * file.
*
* This file contains inverse-DCT routines that produce reduced-size output:
* either 4x4, 2x2, or 1x1 pixels from an 8x8 DCT block.
@@ -57,20 +58,20 @@
*/
#if CONST_BITS == 13
-#define FIX_0_211164243 ((INT32) 1730) /* FIX(0.211164243) */
-#define FIX_0_509795579 ((INT32) 4176) /* FIX(0.509795579) */
-#define FIX_0_601344887 ((INT32) 4926) /* FIX(0.601344887) */
-#define FIX_0_720959822 ((INT32) 5906) /* FIX(0.720959822) */
-#define FIX_0_765366865 ((INT32) 6270) /* FIX(0.765366865) */
-#define FIX_0_850430095 ((INT32) 6967) /* FIX(0.850430095) */
-#define FIX_0_899976223 ((INT32) 7373) /* FIX(0.899976223) */
-#define FIX_1_061594337 ((INT32) 8697) /* FIX(1.061594337) */
-#define FIX_1_272758580 ((INT32) 10426) /* FIX(1.272758580) */
-#define FIX_1_451774981 ((INT32) 11893) /* FIX(1.451774981) */
-#define FIX_1_847759065 ((INT32) 15137) /* FIX(1.847759065) */
-#define FIX_2_172734803 ((INT32) 17799) /* FIX(2.172734803) */
-#define FIX_2_562915447 ((INT32) 20995) /* FIX(2.562915447) */
-#define FIX_3_624509785 ((INT32) 29692) /* FIX(3.624509785) */
+#define FIX_0_211164243 ((JLONG) 1730) /* FIX(0.211164243) */
+#define FIX_0_509795579 ((JLONG) 4176) /* FIX(0.509795579) */
+#define FIX_0_601344887 ((JLONG) 4926) /* FIX(0.601344887) */
+#define FIX_0_720959822 ((JLONG) 5906) /* FIX(0.720959822) */
+#define FIX_0_765366865 ((JLONG) 6270) /* FIX(0.765366865) */
+#define FIX_0_850430095 ((JLONG) 6967) /* FIX(0.850430095) */
+#define FIX_0_899976223 ((JLONG) 7373) /* FIX(0.899976223) */
+#define FIX_1_061594337 ((JLONG) 8697) /* FIX(1.061594337) */
+#define FIX_1_272758580 ((JLONG) 10426) /* FIX(1.272758580) */
+#define FIX_1_451774981 ((JLONG) 11893) /* FIX(1.451774981) */
+#define FIX_1_847759065 ((JLONG) 15137) /* FIX(1.847759065) */
+#define FIX_2_172734803 ((JLONG) 17799) /* FIX(2.172734803) */
+#define FIX_2_562915447 ((JLONG) 20995) /* FIX(2.562915447) */
+#define FIX_3_624509785 ((JLONG) 29692) /* FIX(3.624509785) */
#else
#define FIX_0_211164243 FIX(0.211164243)
#define FIX_0_509795579 FIX(0.509795579)
@@ -89,7 +90,7 @@
#endif
-/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
+/* Multiply a JLONG variable by a JLONG constant to yield a JLONG result.
* For 8-bit samples with the recommended scaling, all the variable
* and constant values involved are no more than 16 bits wide, so a
* 16x16->32 bit multiply can be used instead of a full 32x32 multiply.
@@ -117,15 +118,15 @@
*/
GLOBAL(void)
-jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info *compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
- INT32 tmp0, tmp2, tmp10, tmp12;
- INT32 z1, z2, z3, z4;
+ JLONG tmp0, tmp2, tmp10, tmp12;
+ JLONG z1, z2, z3, z4;
JCOEFPTR inptr;
- ISLOW_MULT_TYPE * quantptr;
- int * wsptr;
+ ISLOW_MULT_TYPE *quantptr;
+ int *wsptr;
JSAMPROW outptr;
JSAMPLE *range_limit = IDCT_range_limit(cinfo);
int ctr;
@@ -205,7 +206,7 @@ jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 &&
wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) {
/* AC terms all zero */
- JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3)
+ JSAMPLE dcval = range_limit[(int) DESCALE((JLONG) wsptr[0], PASS1_BITS+3)
& RANGE_MASK];
outptr[0] = dcval;
@@ -220,20 +221,20 @@ jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
/* Even part */
- tmp0 = LEFT_SHIFT((INT32) wsptr[0], CONST_BITS+1);
+ tmp0 = LEFT_SHIFT((JLONG) wsptr[0], CONST_BITS+1);
- tmp2 = MULTIPLY((INT32) wsptr[2], FIX_1_847759065)
- + MULTIPLY((INT32) wsptr[6], - FIX_0_765366865);
+ tmp2 = MULTIPLY((JLONG) wsptr[2], FIX_1_847759065)
+ + MULTIPLY((JLONG) wsptr[6], - FIX_0_765366865);
tmp10 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
/* Odd part */
- z1 = (INT32) wsptr[7];
- z2 = (INT32) wsptr[5];
- z3 = (INT32) wsptr[3];
- z4 = (INT32) wsptr[1];
+ z1 = (JLONG) wsptr[7];
+ z2 = (JLONG) wsptr[5];
+ z3 = (JLONG) wsptr[3];
+ z4 = (JLONG) wsptr[1];
tmp0 = MULTIPLY(z1, - FIX_0_211164243) /* sqrt(2) * (c3-c1) */
+ MULTIPLY(z2, FIX_1_451774981) /* sqrt(2) * (c3+c7) */
@@ -271,14 +272,14 @@ jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
*/
GLOBAL(void)
-jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info *compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
- INT32 tmp0, tmp10, z1;
+ JLONG tmp0, tmp10, z1;
JCOEFPTR inptr;
- ISLOW_MULT_TYPE * quantptr;
- int * wsptr;
+ ISLOW_MULT_TYPE *quantptr;
+ int *wsptr;
JSAMPROW outptr;
JSAMPLE *range_limit = IDCT_range_limit(cinfo);
int ctr;
@@ -338,7 +339,7 @@ jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
#ifndef NO_ZERO_ROW_TEST
if (wsptr[1] == 0 && wsptr[3] == 0 && wsptr[5] == 0 && wsptr[7] == 0) {
/* AC terms all zero */
- JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3)
+ JSAMPLE dcval = range_limit[(int) DESCALE((JLONG) wsptr[0], PASS1_BITS+3)
& RANGE_MASK];
outptr[0] = dcval;
@@ -351,14 +352,14 @@ jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
/* Even part */
- tmp10 = LEFT_SHIFT((INT32) wsptr[0], CONST_BITS+2);
+ tmp10 = LEFT_SHIFT((JLONG) wsptr[0], CONST_BITS+2);
/* Odd part */
- tmp0 = MULTIPLY((INT32) wsptr[7], - FIX_0_720959822) /* sqrt(2) * (c7-c5+c3-c1) */
- + MULTIPLY((INT32) wsptr[5], FIX_0_850430095) /* sqrt(2) * (-c1+c3+c5+c7) */
- + MULTIPLY((INT32) wsptr[3], - FIX_1_272758580) /* sqrt(2) * (-c1+c3-c5-c7) */
- + MULTIPLY((INT32) wsptr[1], FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */
+ tmp0 = MULTIPLY((JLONG) wsptr[7], - FIX_0_720959822) /* sqrt(2) * (c7-c5+c3-c1) */
+ + MULTIPLY((JLONG) wsptr[5], FIX_0_850430095) /* sqrt(2) * (-c1+c3+c5+c7) */
+ + MULTIPLY((JLONG) wsptr[3], - FIX_1_272758580) /* sqrt(2) * (-c1+c3-c5-c7) */
+ + MULTIPLY((JLONG) wsptr[1], FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */
/* Final output stage */
@@ -380,12 +381,12 @@ jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
*/
GLOBAL(void)
-jpeg_idct_1x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
+jpeg_idct_1x1 (j_decompress_ptr cinfo, jpeg_component_info *compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
int dcval;
- ISLOW_MULT_TYPE * quantptr;
+ ISLOW_MULT_TYPE *quantptr;
JSAMPLE *range_limit = IDCT_range_limit(cinfo);
SHIFT_TEMPS
@@ -394,7 +395,7 @@ jpeg_idct_1x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
*/
quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
dcval = DEQUANTIZE(coef_block[0], quantptr[0]);
- dcval = (int) DESCALE((INT32) dcval, 3);
+ dcval = (int) DESCALE((JLONG) dcval, 3);
output_buf[0][output_col] = range_limit[dcval & RANGE_MASK];
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-25 06:55:33 +0000