diff options
Diffstat (limited to 'pflib.c')
| -rw-r--r-- | pflib.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/pflib.c b/pflib.c new file mode 100644 index 0000000000..1154d0c9a3 --- /dev/null +++ b/pflib.c @@ -0,0 +1,213 @@ +/* + * PixelFormat conversion library. + * + * Author: Gerd Hoffmann <kraxel@redhat.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + */ +#include "qemu-common.h" +#include "console.h" +#include "pflib.h" + +typedef struct QemuPixel QemuPixel; + +typedef void (*pf_convert)(QemuPfConv *conv, + void *dst, void *src, uint32_t cnt); +typedef void (*pf_convert_from)(PixelFormat *pf, + QemuPixel *dst, void *src, uint32_t cnt); +typedef void (*pf_convert_to)(PixelFormat *pf, + void *dst, QemuPixel *src, uint32_t cnt); + +struct QemuPfConv { + pf_convert convert; + PixelFormat src; + PixelFormat dst; + + /* for copy_generic() */ + pf_convert_from conv_from; + pf_convert_to conv_to; + QemuPixel *conv_buf; + uint32_t conv_cnt; +}; + +struct QemuPixel { + uint8_t red; + uint8_t green; + uint8_t blue; + uint8_t alpha; +}; + +/* ----------------------------------------------------------------------- */ +/* PixelFormat -> QemuPixel conversions */ + +static void conv_16_to_pixel(PixelFormat *pf, + QemuPixel *dst, void *src, uint32_t cnt) +{ + uint16_t *src16 = src; + + while (cnt > 0) { + dst->red = ((*src16 & pf->rmask) >> pf->rshift) << (8 - pf->rbits); + dst->green = ((*src16 & pf->gmask) >> pf->gshift) << (8 - pf->gbits); + dst->blue = ((*src16 & pf->bmask) >> pf->bshift) << (8 - pf->bbits); + dst->alpha = ((*src16 & pf->amask) >> pf->ashift) << (8 - pf->abits); + dst++, src16++, cnt--; + } +} + +/* assumes pf->{r,g,b,a}bits == 8 */ +static void conv_32_to_pixel_fast(PixelFormat *pf, + QemuPixel *dst, void *src, uint32_t cnt) +{ + uint32_t *src32 = src; + + while (cnt > 0) { + dst->red = (*src32 & pf->rmask) >> pf->rshift; + dst->green = (*src32 & pf->gmask) >> pf->gshift; + dst->blue = (*src32 & pf->bmask) >> pf->bshift; + dst->alpha = (*src32 & pf->amask) >> pf->ashift; + dst++, src32++, cnt--; + } +} + +static void conv_32_to_pixel_generic(PixelFormat *pf, + QemuPixel *dst, void *src, uint32_t cnt) +{ + uint32_t *src32 = src; + + while (cnt > 0) { + if (pf->rbits < 8) { + dst->red = ((*src32 & pf->rmask) >> pf->rshift) << (8 - pf->rbits); + } else { + dst->red = ((*src32 & pf->rmask) >> pf->rshift) >> (pf->rbits - 8); + } + if (pf->gbits < 8) { + dst->green = ((*src32 & pf->gmask) >> pf->gshift) << (8 - pf->gbits); + } else { + dst->green = ((*src32 & pf->gmask) >> pf->gshift) >> (pf->gbits - 8); + } + if (pf->bbits < 8) { + dst->blue = ((*src32 & pf->bmask) >> pf->bshift) << (8 - pf->bbits); + } else { + dst->blue = ((*src32 & pf->bmask) >> pf->bshift) >> (pf->bbits - 8); + } + if (pf->abits < 8) { + dst->alpha = ((*src32 & pf->amask) >> pf->ashift) << (8 - pf->abits); + } else { + dst->alpha = ((*src32 & pf->amask) >> pf->ashift) >> (pf->abits - 8); + } + dst++, src32++, cnt--; + } +} + +/* ----------------------------------------------------------------------- */ +/* QemuPixel -> PixelFormat conversions */ + +static void conv_pixel_to_16(PixelFormat *pf, + void *dst, QemuPixel *src, uint32_t cnt) +{ + uint16_t *dst16 = dst; + + while (cnt > 0) { + *dst16 = ((uint16_t)src->red >> (8 - pf->rbits)) << pf->rshift; + *dst16 |= ((uint16_t)src->green >> (8 - pf->gbits)) << pf->gshift; + *dst16 |= ((uint16_t)src->blue >> (8 - pf->bbits)) << pf->bshift; + *dst16 |= ((uint16_t)src->alpha >> (8 - pf->abits)) << pf->ashift; + dst16++, src++, cnt--; + } +} + +static void conv_pixel_to_32(PixelFormat *pf, + void *dst, QemuPixel *src, uint32_t cnt) +{ + uint32_t *dst32 = dst; + + while (cnt > 0) { + *dst32 = ((uint32_t)src->red >> (8 - pf->rbits)) << pf->rshift; + *dst32 |= ((uint32_t)src->green >> (8 - pf->gbits)) << pf->gshift; + *dst32 |= ((uint32_t)src->blue >> (8 - pf->bbits)) << pf->bshift; + *dst32 |= ((uint32_t)src->alpha >> (8 - pf->abits)) << pf->ashift; + dst32++, src++, cnt--; + } +} + +/* ----------------------------------------------------------------------- */ +/* PixelFormat -> PixelFormat conversions */ + +static void convert_copy(QemuPfConv *conv, void *dst, void *src, uint32_t cnt) +{ + uint32_t bytes = cnt * conv->src.bytes_per_pixel; + memcpy(dst, src, bytes); +} + +static void convert_generic(QemuPfConv *conv, void *dst, void *src, uint32_t cnt) +{ + if (conv->conv_cnt < cnt) { + conv->conv_cnt = cnt; + conv->conv_buf = qemu_realloc(conv->conv_buf, sizeof(QemuPixel) * conv->conv_cnt); + } + conv->conv_from(&conv->src, conv->conv_buf, src, cnt); + conv->conv_to(&conv->dst, dst, conv->conv_buf, cnt); +} + +/* ----------------------------------------------------------------------- */ +/* public interface */ + +QemuPfConv *qemu_pf_conv_get(PixelFormat *dst, PixelFormat *src) +{ + QemuPfConv *conv = qemu_mallocz(sizeof(QemuPfConv)); + + conv->src = *src; + conv->dst = *dst; + + if (memcmp(&conv->src, &conv->dst, sizeof(PixelFormat)) == 0) { + /* formats identical, can simply copy */ + conv->convert = convert_copy; + } else { + /* generic two-step conversion: src -> QemuPixel -> dst */ + switch (conv->src.bytes_per_pixel) { + case 2: + conv->conv_from = conv_16_to_pixel; + break; + case 4: + if (conv->src.rbits == 8 && conv->src.gbits == 8 && conv->src.bbits == 8) { + conv->conv_from = conv_32_to_pixel_fast; + } else { + conv->conv_from = conv_32_to_pixel_generic; + } + break; + default: + goto err; + } + switch (conv->dst.bytes_per_pixel) { + case 2: + conv->conv_to = conv_pixel_to_16; + break; + case 4: + conv->conv_to = conv_pixel_to_32; + break; + default: + goto err; + } + conv->convert = convert_generic; + } + return conv; + +err: + qemu_free(conv); + return NULL; +} + +void qemu_pf_conv_run(QemuPfConv *conv, void *dst, void *src, uint32_t cnt) +{ + conv->convert(conv, dst, src, cnt); +} + +void qemu_pf_conv_put(QemuPfConv *conv) +{ + if (conv) { + qemu_free(conv->conv_buf); + qemu_free(conv); + } +} |