Gerd Hoffmann | d6d94fc | 2010-06-14 09:54:27 +0200 | [diff] [blame] | 1 | /* |
| 2 | * PixelFormat conversion library. |
| 3 | * |
| 4 | * Author: Gerd Hoffmann <kraxel@redhat.com> |
| 5 | * |
| 6 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 7 | * the COPYING file in the top-level directory. |
| 8 | * |
| 9 | */ |
| 10 | #include "qemu-common.h" |
| 11 | #include "console.h" |
| 12 | #include "pflib.h" |
| 13 | |
| 14 | typedef struct QemuPixel QemuPixel; |
| 15 | |
| 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); |
| 22 | |
| 23 | struct QemuPfConv { |
| 24 | pf_convert convert; |
| 25 | PixelFormat src; |
| 26 | PixelFormat dst; |
| 27 | |
| 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; |
| 33 | }; |
| 34 | |
| 35 | struct QemuPixel { |
| 36 | uint8_t red; |
| 37 | uint8_t green; |
| 38 | uint8_t blue; |
| 39 | uint8_t alpha; |
| 40 | }; |
| 41 | |
| 42 | /* ----------------------------------------------------------------------- */ |
| 43 | /* PixelFormat -> QemuPixel conversions */ |
| 44 | |
| 45 | static void conv_16_to_pixel(PixelFormat *pf, |
| 46 | QemuPixel *dst, void *src, uint32_t cnt) |
| 47 | { |
| 48 | uint16_t *src16 = src; |
| 49 | |
| 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--; |
| 56 | } |
| 57 | } |
| 58 | |
| 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) |
| 62 | { |
| 63 | uint32_t *src32 = src; |
| 64 | |
| 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--; |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | static void conv_32_to_pixel_generic(PixelFormat *pf, |
| 75 | QemuPixel *dst, void *src, uint32_t cnt) |
| 76 | { |
| 77 | uint32_t *src32 = src; |
| 78 | |
| 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); |
| 84 | } |
| 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); |
| 89 | } |
| 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); |
| 94 | } |
| 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); |
| 99 | } |
| 100 | dst++, src32++, cnt--; |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | /* ----------------------------------------------------------------------- */ |
| 105 | /* QemuPixel -> PixelFormat conversions */ |
| 106 | |
| 107 | static void conv_pixel_to_16(PixelFormat *pf, |
| 108 | void *dst, QemuPixel *src, uint32_t cnt) |
| 109 | { |
| 110 | uint16_t *dst16 = dst; |
| 111 | |
| 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--; |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | static void conv_pixel_to_32(PixelFormat *pf, |
| 122 | void *dst, QemuPixel *src, uint32_t cnt) |
| 123 | { |
| 124 | uint32_t *dst32 = dst; |
| 125 | |
| 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--; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | /* ----------------------------------------------------------------------- */ |
| 136 | /* PixelFormat -> PixelFormat conversions */ |
| 137 | |
| 138 | static void convert_copy(QemuPfConv *conv, void *dst, void *src, uint32_t cnt) |
| 139 | { |
| 140 | uint32_t bytes = cnt * conv->src.bytes_per_pixel; |
| 141 | memcpy(dst, src, bytes); |
| 142 | } |
| 143 | |
| 144 | static void convert_generic(QemuPfConv *conv, void *dst, void *src, uint32_t cnt) |
| 145 | { |
| 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); |
| 149 | } |
| 150 | conv->conv_from(&conv->src, conv->conv_buf, src, cnt); |
| 151 | conv->conv_to(&conv->dst, dst, conv->conv_buf, cnt); |
| 152 | } |
| 153 | |
| 154 | /* ----------------------------------------------------------------------- */ |
| 155 | /* public interface */ |
| 156 | |
| 157 | QemuPfConv *qemu_pf_conv_get(PixelFormat *dst, PixelFormat *src) |
| 158 | { |
| 159 | QemuPfConv *conv = qemu_mallocz(sizeof(QemuPfConv)); |
| 160 | |
| 161 | conv->src = *src; |
| 162 | conv->dst = *dst; |
| 163 | |
| 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; |
| 178 | } |
| 179 | break; |
| 180 | default: |
| 181 | goto err; |
| 182 | } |
| 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; |
| 192 | } |
| 193 | conv->convert = convert_generic; |
| 194 | } |
| 195 | return conv; |
| 196 | |
| 197 | err: |
| 198 | qemu_free(conv); |
| 199 | return NULL; |
| 200 | } |
| 201 | |
| 202 | void qemu_pf_conv_run(QemuPfConv *conv, void *dst, void *src, uint32_t cnt) |
| 203 | { |
| 204 | conv->convert(conv, dst, src, cnt); |
| 205 | } |
| 206 | |
| 207 | void qemu_pf_conv_put(QemuPfConv *conv) |
| 208 | { |
| 209 | if (conv) { |
| 210 | qemu_free(conv->conv_buf); |
| 211 | qemu_free(conv); |
| 212 | } |
| 213 | } |