[qemu.git] / pflib.c

/*
 * 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);
    }
}
Commit	Line	Data
d6d94fc3 GH	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;
7267c094	148	conv->conv_buf = g_realloc(conv->conv_buf, sizeof(QemuPixel) * conv->conv_cnt);
d6d94fc3 GH	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	{
7267c094	159	QemuPfConv *conv = g_malloc0(sizeof(QemuPfConv));
d6d94fc3 GH	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:
7267c094	198	g_free(conv);
d6d94fc3 GH	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) {
7267c094 AL	210	g_free(conv->conv_buf);
7267c094 AL	211	g_free(conv);
d6d94fc3 GH	212	}
d6d94fc3 GH	213	}