/* * 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 = g_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 = g_malloc0(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: g_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) { g_free(conv->conv_buf); g_free(conv); } }