target-arm: Fix mixup in decoding of saturating add and sub
[qemu.git] / pflib.c
blob1154d0c9a3fc6c5efaf8b61d08b2a485c4fcd170
1 /*
2 * PixelFormat conversion library.
4 * Author: Gerd Hoffmann <kraxel@redhat.com>
6 * This work is licensed under the terms of the GNU GPL, version 2. See
7 * the COPYING file in the top-level directory.
9 */
10 #include "qemu-common.h"
11 #include "console.h"
12 #include "pflib.h"
14 typedef struct QemuPixel QemuPixel;
16 typedef void (*pf_convert)(QemuPfConv *conv,
17 void *dst, void *src, uint32_t cnt);
18 typedef void (*pf_convert_from)(PixelFormat *pf,
19 QemuPixel *dst, void *src, uint32_t cnt);
20 typedef void (*pf_convert_to)(PixelFormat *pf,
21 void *dst, QemuPixel *src, uint32_t cnt);
23 struct QemuPfConv {
24 pf_convert convert;
25 PixelFormat src;
26 PixelFormat dst;
28 /* for copy_generic() */
29 pf_convert_from conv_from;
30 pf_convert_to conv_to;
31 QemuPixel *conv_buf;
32 uint32_t conv_cnt;
35 struct QemuPixel {
36 uint8_t red;
37 uint8_t green;
38 uint8_t blue;
39 uint8_t alpha;
42 /* ----------------------------------------------------------------------- */
43 /* PixelFormat -> QemuPixel conversions */
45 static void conv_16_to_pixel(PixelFormat *pf,
46 QemuPixel *dst, void *src, uint32_t cnt)
48 uint16_t *src16 = src;
50 while (cnt > 0) {
51 dst->red = ((*src16 & pf->rmask) >> pf->rshift) << (8 - pf->rbits);
52 dst->green = ((*src16 & pf->gmask) >> pf->gshift) << (8 - pf->gbits);
53 dst->blue = ((*src16 & pf->bmask) >> pf->bshift) << (8 - pf->bbits);
54 dst->alpha = ((*src16 & pf->amask) >> pf->ashift) << (8 - pf->abits);
55 dst++, src16++, cnt--;
59 /* assumes pf->{r,g,b,a}bits == 8 */
60 static void conv_32_to_pixel_fast(PixelFormat *pf,
61 QemuPixel *dst, void *src, uint32_t cnt)
63 uint32_t *src32 = src;
65 while (cnt > 0) {
66 dst->red = (*src32 & pf->rmask) >> pf->rshift;
67 dst->green = (*src32 & pf->gmask) >> pf->gshift;
68 dst->blue = (*src32 & pf->bmask) >> pf->bshift;
69 dst->alpha = (*src32 & pf->amask) >> pf->ashift;
70 dst++, src32++, cnt--;
74 static void conv_32_to_pixel_generic(PixelFormat *pf,
75 QemuPixel *dst, void *src, uint32_t cnt)
77 uint32_t *src32 = src;
79 while (cnt > 0) {
80 if (pf->rbits < 8) {
81 dst->red = ((*src32 & pf->rmask) >> pf->rshift) << (8 - pf->rbits);
82 } else {
83 dst->red = ((*src32 & pf->rmask) >> pf->rshift) >> (pf->rbits - 8);
85 if (pf->gbits < 8) {
86 dst->green = ((*src32 & pf->gmask) >> pf->gshift) << (8 - pf->gbits);
87 } else {
88 dst->green = ((*src32 & pf->gmask) >> pf->gshift) >> (pf->gbits - 8);
90 if (pf->bbits < 8) {
91 dst->blue = ((*src32 & pf->bmask) >> pf->bshift) << (8 - pf->bbits);
92 } else {
93 dst->blue = ((*src32 & pf->bmask) >> pf->bshift) >> (pf->bbits - 8);
95 if (pf->abits < 8) {
96 dst->alpha = ((*src32 & pf->amask) >> pf->ashift) << (8 - pf->abits);
97 } else {
98 dst->alpha = ((*src32 & pf->amask) >> pf->ashift) >> (pf->abits - 8);
100 dst++, src32++, cnt--;
104 /* ----------------------------------------------------------------------- */
105 /* QemuPixel -> PixelFormat conversions */
107 static void conv_pixel_to_16(PixelFormat *pf,
108 void *dst, QemuPixel *src, uint32_t cnt)
110 uint16_t *dst16 = dst;
112 while (cnt > 0) {
113 *dst16 = ((uint16_t)src->red >> (8 - pf->rbits)) << pf->rshift;
114 *dst16 |= ((uint16_t)src->green >> (8 - pf->gbits)) << pf->gshift;
115 *dst16 |= ((uint16_t)src->blue >> (8 - pf->bbits)) << pf->bshift;
116 *dst16 |= ((uint16_t)src->alpha >> (8 - pf->abits)) << pf->ashift;
117 dst16++, src++, cnt--;
121 static void conv_pixel_to_32(PixelFormat *pf,
122 void *dst, QemuPixel *src, uint32_t cnt)
124 uint32_t *dst32 = dst;
126 while (cnt > 0) {
127 *dst32 = ((uint32_t)src->red >> (8 - pf->rbits)) << pf->rshift;
128 *dst32 |= ((uint32_t)src->green >> (8 - pf->gbits)) << pf->gshift;
129 *dst32 |= ((uint32_t)src->blue >> (8 - pf->bbits)) << pf->bshift;
130 *dst32 |= ((uint32_t)src->alpha >> (8 - pf->abits)) << pf->ashift;
131 dst32++, src++, cnt--;
135 /* ----------------------------------------------------------------------- */
136 /* PixelFormat -> PixelFormat conversions */
138 static void convert_copy(QemuPfConv *conv, void *dst, void *src, uint32_t cnt)
140 uint32_t bytes = cnt * conv->src.bytes_per_pixel;
141 memcpy(dst, src, bytes);
144 static void convert_generic(QemuPfConv *conv, void *dst, void *src, uint32_t cnt)
146 if (conv->conv_cnt < cnt) {
147 conv->conv_cnt = cnt;
148 conv->conv_buf = qemu_realloc(conv->conv_buf, sizeof(QemuPixel) * conv->conv_cnt);
150 conv->conv_from(&conv->src, conv->conv_buf, src, cnt);
151 conv->conv_to(&conv->dst, dst, conv->conv_buf, cnt);
154 /* ----------------------------------------------------------------------- */
155 /* public interface */
157 QemuPfConv *qemu_pf_conv_get(PixelFormat *dst, PixelFormat *src)
159 QemuPfConv *conv = qemu_mallocz(sizeof(QemuPfConv));
161 conv->src = *src;
162 conv->dst = *dst;
164 if (memcmp(&conv->src, &conv->dst, sizeof(PixelFormat)) == 0) {
165 /* formats identical, can simply copy */
166 conv->convert = convert_copy;
167 } else {
168 /* generic two-step conversion: src -> QemuPixel -> dst */
169 switch (conv->src.bytes_per_pixel) {
170 case 2:
171 conv->conv_from = conv_16_to_pixel;
172 break;
173 case 4:
174 if (conv->src.rbits == 8 && conv->src.gbits == 8 && conv->src.bbits == 8) {
175 conv->conv_from = conv_32_to_pixel_fast;
176 } else {
177 conv->conv_from = conv_32_to_pixel_generic;
179 break;
180 default:
181 goto err;
183 switch (conv->dst.bytes_per_pixel) {
184 case 2:
185 conv->conv_to = conv_pixel_to_16;
186 break;
187 case 4:
188 conv->conv_to = conv_pixel_to_32;
189 break;
190 default:
191 goto err;
193 conv->convert = convert_generic;
195 return conv;
197 err:
198 qemu_free(conv);
199 return NULL;
202 void qemu_pf_conv_run(QemuPfConv *conv, void *dst, void *src, uint32_t cnt)
204 conv->convert(conv, dst, src, cnt);
207 void qemu_pf_conv_put(QemuPfConv *conv)
209 if (conv) {
210 qemu_free(conv->conv_buf);
211 qemu_free(conv);