SDL: src/render/software/SDL_blendline.c@b94b6d0bff0f (annotated)

slouken@2888	1	/*
slouken@5535	2	Simple DirectMedia Layer
slouken@9619	3	Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
slouken@2888	4
slouken@5535	5	This software is provided 'as-is', without any express or implied
slouken@5535	6	warranty. In no event will the authors be held liable for any damages
slouken@5535	7	arising from the use of this software.
slouken@2888	8
slouken@5535	9	Permission is granted to anyone to use this software for any purpose,
slouken@5535	10	including commercial applications, and to alter it and redistribute it
slouken@5535	11	freely, subject to the following restrictions:
slouken@2888	12
slouken@5535	13	1. The origin of this software must not be misrepresented; you must not
slouken@5535	14	claim that you wrote the original software. If you use this software
slouken@5535	15	in a product, an acknowledgment in the product documentation would be
slouken@5535	16	appreciated but is not required.
slouken@5535	17	2. Altered source versions must be plainly marked as such, and must not be
slouken@5535	18	misrepresented as being the original software.
slouken@5535	19	3. This notice may not be removed or altered from any source distribution.
slouken@2888	20	*/
icculus@8093	21	#include "../../SDL_internal.h"
slouken@2888	22
slouken@5226	23	#if !SDL_RENDER_DISABLED
slouken@5226	24
slouken@2898	25	#include "SDL_draw.h"
slouken@5163	26	#include "SDL_blendline.h"
slouken@5166	27	#include "SDL_blendpoint.h"
slouken@2898	28
slouken@3596	29
slouken@3596	30	static void
slouken@3596	31	SDL_BlendLine_RGB2(SDL_Surface * dst, int x1, int y1, int x2, int y2,
slouken@4929	32	SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
slouken@3596	33	SDL_bool draw_end)
slouken@2898	34	{
slouken@3596	35	const SDL_PixelFormat *fmt = dst->format;
slouken@3596	36	unsigned r, g, b, a, inva;
slouken@3596	37
slouken@3596	38	if (blendMode == SDL_BLENDMODE_BLEND \|\| blendMode == SDL_BLENDMODE_ADD) {
slouken@3596	39	r = DRAW_MUL(_r, _a);
slouken@3596	40	g = DRAW_MUL(_g, _a);
slouken@3596	41	b = DRAW_MUL(_b, _a);
slouken@3596	42	a = _a;
slouken@3596	43	} else {
slouken@3596	44	r = _r;
slouken@3596	45	g = _g;
slouken@3596	46	b = _b;
slouken@3596	47	a = _a;
slouken@3596	48	}
slouken@3596	49	inva = (a ^ 0xff);
slouken@2888	50
slouken@3596	51	if (y1 == y2) {
slouken@3596	52	switch (blendMode) {
slouken@3596	53	case SDL_BLENDMODE_BLEND:
slouken@3596	54	HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);
slouken@3596	55	break;
slouken@3596	56	case SDL_BLENDMODE_ADD:
slouken@3596	57	HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);
slouken@3596	58	break;
slouken@5184	59	case SDL_BLENDMODE_MOD:
slouken@5184	60	HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
slouken@5184	61	break;
slouken@3596	62	default:
slouken@3596	63	HLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);
slouken@3596	64	break;
slouken@3596	65	}
slouken@3596	66	} else if (x1 == x2) {
slouken@3596	67	switch (blendMode) {
slouken@3596	68	case SDL_BLENDMODE_BLEND:
slouken@3596	69	VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);
slouken@3596	70	break;
slouken@3596	71	case SDL_BLENDMODE_ADD:
slouken@3596	72	VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);
slouken@3596	73	break;
slouken@5184	74	case SDL_BLENDMODE_MOD:
slouken@5184	75	VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
slouken@5184	76	break;
slouken@3596	77	default:
slouken@3596	78	VLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);
slouken@3596	79	break;
slouken@3596	80	}
slouken@3596	81	} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
slouken@3596	82	switch (blendMode) {
slouken@3596	83	case SDL_BLENDMODE_BLEND:
slouken@3596	84	DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);
slouken@3596	85	break;
slouken@3596	86	case SDL_BLENDMODE_ADD:
slouken@3596	87	DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);
slouken@3596	88	break;
slouken@5184	89	case SDL_BLENDMODE_MOD:
slouken@5184	90	DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
slouken@5184	91	break;
slouken@3596	92	default:
slouken@3596	93	DLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);
slouken@3596	94	break;
slouken@3596	95	}
slouken@3596	96	} else {
slouken@3596	97	switch (blendMode) {
slouken@3596	98	case SDL_BLENDMODE_BLEND:
slouken@3596	99	AALINE(x1, y1, x2, y2,
slouken@3596	100	DRAW_SETPIXELXY2_BLEND_RGB, DRAW_SETPIXELXY2_BLEND_RGB,
slouken@3596	101	draw_end);
slouken@3596	102	break;
slouken@3596	103	case SDL_BLENDMODE_ADD:
slouken@3596	104	AALINE(x1, y1, x2, y2,
slouken@3596	105	DRAW_SETPIXELXY2_ADD_RGB, DRAW_SETPIXELXY2_ADD_RGB,
slouken@3596	106	draw_end);
slouken@3596	107	break;
slouken@5184	108	case SDL_BLENDMODE_MOD:
slouken@5184	109	AALINE(x1, y1, x2, y2,
slouken@5184	110	DRAW_SETPIXELXY2_MOD_RGB, DRAW_SETPIXELXY2_MOD_RGB,
slouken@5184	111	draw_end);
slouken@5184	112	break;
slouken@3596	113	default:
slouken@3596	114	AALINE(x1, y1, x2, y2,
slouken@3596	115	DRAW_SETPIXELXY2_RGB, DRAW_SETPIXELXY2_BLEND_RGB,
slouken@3596	116	draw_end);
slouken@3596	117	break;
slouken@3596	118	}
slouken@2898	119	}
slouken@2898	120	}
slouken@2896	121
slouken@3596	122	static void
slouken@3596	123	SDL_BlendLine_RGB555(SDL_Surface * dst, int x1, int y1, int x2, int y2,
slouken@4929	124	SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
slouken@3594	125	SDL_bool draw_end)
slouken@2898	126	{
slouken@3596	127	unsigned r, g, b, a, inva;
slouken@2898	128
slouken@3596	129	if (blendMode == SDL_BLENDMODE_BLEND \|\| blendMode == SDL_BLENDMODE_ADD) {
slouken@3596	130	r = DRAW_MUL(_r, _a);
slouken@3596	131	g = DRAW_MUL(_g, _a);
slouken@3596	132	b = DRAW_MUL(_b, _a);
slouken@3596	133	a = _a;
slouken@3596	134	} else {
slouken@3596	135	r = _r;
slouken@3596	136	g = _g;
slouken@3596	137	b = _b;
slouken@3596	138	a = _a;
slouken@2898	139	}
slouken@3596	140	inva = (a ^ 0xff);
slouken@2896	141
slouken@3596	142	if (y1 == y2) {
slouken@3596	143	switch (blendMode) {
slouken@3596	144	case SDL_BLENDMODE_BLEND:
slouken@3596	145	HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end);
slouken@3596	146	break;
slouken@3596	147	case SDL_BLENDMODE_ADD:
slouken@3596	148	HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end);
slouken@3596	149	break;
slouken@5184	150	case SDL_BLENDMODE_MOD:
slouken@5184	151	HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
slouken@5184	152	break;
slouken@3596	153	default:
slouken@3596	154	HLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end);
slouken@3596	155	break;
slouken@3596	156	}
slouken@3596	157	} else if (x1 == x2) {
slouken@3596	158	switch (blendMode) {
slouken@3596	159	case SDL_BLENDMODE_BLEND:
slouken@3596	160	VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end);
slouken@3596	161	break;
slouken@3596	162	case SDL_BLENDMODE_ADD:
slouken@3596	163	VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end);
slouken@3596	164	break;
slouken@5184	165	case SDL_BLENDMODE_MOD:
slouken@5184	166	VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
slouken@5184	167	break;
slouken@3596	168	default:
slouken@3596	169	VLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end);
slouken@3596	170	break;
slouken@3596	171	}
slouken@3596	172	} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
slouken@3596	173	switch (blendMode) {
slouken@3596	174	case SDL_BLENDMODE_BLEND:
slouken@3596	175	DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end);
slouken@3596	176	break;
slouken@3596	177	case SDL_BLENDMODE_ADD:
slouken@3596	178	DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end);
slouken@3596	179	break;
slouken@5184	180	case SDL_BLENDMODE_MOD:
slouken@5184	181	DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
slouken@5184	182	break;
slouken@3596	183	default:
slouken@3596	184	DLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end);
slouken@3596	185	break;
slouken@3596	186	}
slouken@3596	187	} else {
slouken@3596	188	switch (blendMode) {
slouken@3596	189	case SDL_BLENDMODE_BLEND:
slouken@3596	190	AALINE(x1, y1, x2, y2,
slouken@3596	191	DRAW_SETPIXELXY_BLEND_RGB555, DRAW_SETPIXELXY_BLEND_RGB555,
slouken@3596	192	draw_end);
slouken@3596	193	break;
slouken@3596	194	case SDL_BLENDMODE_ADD:
slouken@3596	195	AALINE(x1, y1, x2, y2,
slouken@3596	196	DRAW_SETPIXELXY_ADD_RGB555, DRAW_SETPIXELXY_ADD_RGB555,
slouken@3596	197	draw_end);
slouken@3596	198	break;
slouken@5184	199	case SDL_BLENDMODE_MOD:
slouken@5184	200	AALINE(x1, y1, x2, y2,
slouken@5184	201	DRAW_SETPIXELXY_MOD_RGB555, DRAW_SETPIXELXY_MOD_RGB555,
slouken@5184	202	draw_end);
slouken@5184	203	break;
slouken@3596	204	default:
slouken@3596	205	AALINE(x1, y1, x2, y2,
slouken@3596	206	DRAW_SETPIXELXY_RGB555, DRAW_SETPIXELXY_BLEND_RGB555,
slouken@3596	207	draw_end);
slouken@3596	208	break;
slouken@3596	209	}
slouken@2899	210	}
slouken@2899	211	}
slouken@2899	212
slouken@3596	213	static void
slouken@3596	214	SDL_BlendLine_RGB565(SDL_Surface * dst, int x1, int y1, int x2, int y2,
slouken@4929	215	SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
slouken@3596	216	SDL_bool draw_end)
slouken@2898	217	{
slouken@3596	218	unsigned r, g, b, a, inva;
slouken@2896	219
slouken@3596	220	if (blendMode == SDL_BLENDMODE_BLEND \|\| blendMode == SDL_BLENDMODE_ADD) {
slouken@3596	221	r = DRAW_MUL(_r, _a);
slouken@3596	222	g = DRAW_MUL(_g, _a);
slouken@3596	223	b = DRAW_MUL(_b, _a);
slouken@3596	224	a = _a;
slouken@3596	225	} else {
slouken@3596	226	r = _r;
slouken@3596	227	g = _g;
slouken@3596	228	b = _b;
slouken@3596	229	a = _a;
slouken@3596	230	}
slouken@3596	231	inva = (a ^ 0xff);
slouken@3596	232
slouken@3596	233	if (y1 == y2) {
slouken@2898	234	switch (blendMode) {
slouken@2898	235	case SDL_BLENDMODE_BLEND:
slouken@3596	236	HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end);
slouken@2898	237	break;
slouken@2898	238	case SDL_BLENDMODE_ADD:
slouken@3596	239	HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end);
slouken@2898	240	break;
slouken@5184	241	case SDL_BLENDMODE_MOD:
slouken@5184	242	HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
slouken@5184	243	break;
slouken@2898	244	default:
slouken@3596	245	HLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end);
slouken@2898	246	break;
slouken@2898	247	}
slouken@3596	248	} else if (x1 == x2) {
slouken@2898	249	switch (blendMode) {
slouken@2898	250	case SDL_BLENDMODE_BLEND:
slouken@3596	251	VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end);
slouken@3596	252	break;
slouken@3596	253	case SDL_BLENDMODE_ADD:
slouken@3596	254	VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end);
slouken@3596	255	break;
slouken@5184	256	case SDL_BLENDMODE_MOD:
slouken@5184	257	VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
slouken@5184	258	break;
slouken@3596	259	default:
slouken@3596	260	VLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end);
slouken@3596	261	break;
slouken@3596	262	}
slouken@3596	263	} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
slouken@3596	264	switch (blendMode) {
slouken@3596	265	case SDL_BLENDMODE_BLEND:
slouken@3596	266	DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end);
slouken@2898	267	break;
slouken@2898	268	case SDL_BLENDMODE_ADD:
slouken@3596	269	DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end);
slouken@2898	270	break;
slouken@5184	271	case SDL_BLENDMODE_MOD:
slouken@5184	272	DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
slouken@5184	273	break;
slouken@2898	274	default:
slouken@3596	275	DLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end);
slouken@2898	276	break;
slouken@2898	277	}
slouken@3596	278	} else {
slouken@3596	279	switch (blendMode) {
slouken@3596	280	case SDL_BLENDMODE_BLEND:
slouken@3596	281	AALINE(x1, y1, x2, y2,
slouken@3596	282	DRAW_SETPIXELXY_BLEND_RGB565, DRAW_SETPIXELXY_BLEND_RGB565,
slouken@3596	283	draw_end);
slouken@3596	284	break;
slouken@3596	285	case SDL_BLENDMODE_ADD:
slouken@3596	286	AALINE(x1, y1, x2, y2,
slouken@3596	287	DRAW_SETPIXELXY_ADD_RGB565, DRAW_SETPIXELXY_ADD_RGB565,
slouken@3596	288	draw_end);
slouken@3596	289	break;
slouken@5184	290	case SDL_BLENDMODE_MOD:
slouken@5184	291	AALINE(x1, y1, x2, y2,
slouken@5184	292	DRAW_SETPIXELXY_MOD_RGB565, DRAW_SETPIXELXY_MOD_RGB565,
slouken@5184	293	draw_end);
slouken@5184	294	break;
slouken@3596	295	default:
slouken@3596	296	AALINE(x1, y1, x2, y2,
slouken@3596	297	DRAW_SETPIXELXY_RGB565, DRAW_SETPIXELXY_BLEND_RGB565,
slouken@3596	298	draw_end);
slouken@3596	299	break;
slouken@3596	300	}
slouken@2898	301	}
slouken@2898	302	}
slouken@2896	303
slouken@3596	304	static void
slouken@3596	305	SDL_BlendLine_RGB4(SDL_Surface * dst, int x1, int y1, int x2, int y2,
slouken@4929	306	SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
slouken@3594	307	SDL_bool draw_end)
slouken@2898	308	{
slouken@3596	309	const SDL_PixelFormat *fmt = dst->format;
slouken@3596	310	unsigned r, g, b, a, inva;
slouken@3596	311
slouken@3596	312	if (blendMode == SDL_BLENDMODE_BLEND \|\| blendMode == SDL_BLENDMODE_ADD) {
slouken@3596	313	r = DRAW_MUL(_r, _a);
slouken@3596	314	g = DRAW_MUL(_g, _a);
slouken@3596	315	b = DRAW_MUL(_b, _a);
slouken@3596	316	a = _a;
slouken@3596	317	} else {
slouken@3596	318	r = _r;
slouken@3596	319	g = _g;
slouken@3596	320	b = _b;
slouken@3596	321	a = _a;
slouken@3596	322	}
slouken@3596	323	inva = (a ^ 0xff);
slouken@2896	324
slouken@3596	325	if (y1 == y2) {
slouken@3596	326	switch (blendMode) {
slouken@3596	327	case SDL_BLENDMODE_BLEND:
slouken@3596	328	HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end);
slouken@3596	329	break;
slouken@3596	330	case SDL_BLENDMODE_ADD:
slouken@3596	331	HLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end);
slouken@3596	332	break;
slouken@5184	333	case SDL_BLENDMODE_MOD:
slouken@5184	334	HLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
slouken@5184	335	break;
slouken@3596	336	default:
slouken@3596	337	HLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end);
slouken@3596	338	break;
slouken@3596	339	}
slouken@3596	340	} else if (x1 == x2) {
slouken@3596	341	switch (blendMode) {
slouken@3596	342	case SDL_BLENDMODE_BLEND:
slouken@3596	343	VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end);
slouken@3596	344	break;
slouken@3596	345	case SDL_BLENDMODE_ADD:
slouken@3596	346	VLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end);
slouken@3596	347	break;
slouken@5184	348	case SDL_BLENDMODE_MOD:
slouken@5184	349	VLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
slouken@5184	350	break;
slouken@3596	351	default:
slouken@3596	352	VLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end);
slouken@3596	353	break;
slouken@3596	354	}
slouken@3596	355	} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
slouken@3596	356	switch (blendMode) {
slouken@3596	357	case SDL_BLENDMODE_BLEND:
slouken@3596	358	DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end);
slouken@3596	359	break;
slouken@3596	360	case SDL_BLENDMODE_ADD:
slouken@3596	361	DLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end);
slouken@3596	362	break;
slouken@5184	363	case SDL_BLENDMODE_MOD:
slouken@5184	364	DLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
slouken@5184	365	break;
slouken@3596	366	default:
slouken@3596	367	DLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end);
slouken@3596	368	break;
slouken@3596	369	}
slouken@3596	370	} else {
slouken@2898	371	switch (blendMode) {
slouken@2898	372	case SDL_BLENDMODE_BLEND:
slouken@3596	373	AALINE(x1, y1, x2, y2,
slouken@3596	374	DRAW_SETPIXELXY4_BLEND_RGB, DRAW_SETPIXELXY4_BLEND_RGB,
slouken@3596	375	draw_end);
slouken@3596	376	break;
slouken@3596	377	case SDL_BLENDMODE_ADD:
slouken@3596	378	AALINE(x1, y1, x2, y2,
slouken@3596	379	DRAW_SETPIXELXY4_ADD_RGB, DRAW_SETPIXELXY4_ADD_RGB,
slouken@3596	380	draw_end);
slouken@3596	381	break;
slouken@5184	382	case SDL_BLENDMODE_MOD:
slouken@5184	383	AALINE(x1, y1, x2, y2,
slouken@5184	384	DRAW_SETPIXELXY4_MOD_RGB, DRAW_SETPIXELXY4_MOD_RGB,
slouken@5184	385	draw_end);
slouken@5184	386	break;
slouken@3596	387	default:
slouken@3596	388	AALINE(x1, y1, x2, y2,
slouken@3596	389	DRAW_SETPIXELXY4_RGB, DRAW_SETPIXELXY4_BLEND_RGB,
slouken@3596	390	draw_end);
slouken@3596	391	break;
slouken@3596	392	}
slouken@3596	393	}
slouken@3596	394	}
slouken@3596	395
slouken@3596	396	static void
slouken@3596	397	SDL_BlendLine_RGBA4(SDL_Surface * dst, int x1, int y1, int x2, int y2,
slouken@4929	398	SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
slouken@3596	399	SDL_bool draw_end)
slouken@3596	400	{
slouken@3596	401	const SDL_PixelFormat *fmt = dst->format;
slouken@3596	402	unsigned r, g, b, a, inva;
slouken@3596	403
slouken@3596	404	if (blendMode == SDL_BLENDMODE_BLEND \|\| blendMode == SDL_BLENDMODE_ADD) {
slouken@3596	405	r = DRAW_MUL(_r, _a);
slouken@3596	406	g = DRAW_MUL(_g, _a);
slouken@3596	407	b = DRAW_MUL(_b, _a);
slouken@3596	408	a = _a;
slouken@3596	409	} else {
slouken@3596	410	r = _r;
slouken@3596	411	g = _g;
slouken@3596	412	b = _b;
slouken@3596	413	a = _a;
slouken@3596	414	}
slouken@3596	415	inva = (a ^ 0xff);
slouken@3596	416
slouken@3596	417	if (y1 == y2) {
slouken@3596	418	switch (blendMode) {
slouken@3596	419	case SDL_BLENDMODE_BLEND:
slouken@3596	420	HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end);
slouken@3596	421	break;
slouken@3596	422	case SDL_BLENDMODE_ADD:
slouken@3596	423	HLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end);
slouken@3596	424	break;
slouken@5184	425	case SDL_BLENDMODE_MOD:
slouken@5184	426	HLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
slouken@5184	427	break;
slouken@3596	428	default:
slouken@3596	429	HLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end);
slouken@3596	430	break;
slouken@3596	431	}
slouken@3596	432	} else if (x1 == x2) {
slouken@3596	433	switch (blendMode) {
slouken@3596	434	case SDL_BLENDMODE_BLEND:
slouken@3596	435	VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end);
slouken@3596	436	break;
slouken@3596	437	case SDL_BLENDMODE_ADD:
slouken@3596	438	VLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end);
slouken@3596	439	break;
slouken@5184	440	case SDL_BLENDMODE_MOD:
slouken@5184	441	VLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
slouken@5184	442	break;
slouken@3596	443	default:
slouken@3596	444	VLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end);
slouken@3596	445	break;
slouken@3596	446	}
slouken@3596	447	} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
slouken@3596	448	switch (blendMode) {
slouken@3596	449	case SDL_BLENDMODE_BLEND:
slouken@3596	450	DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end);
slouken@3596	451	break;
slouken@3596	452	case SDL_BLENDMODE_ADD:
slouken@3596	453	DLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end);
slouken@3596	454	break;
slouken@5184	455	case SDL_BLENDMODE_MOD:
slouken@5184	456	DLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
slouken@5184	457	break;
slouken@3596	458	default:
slouken@3596	459	DLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end);
slouken@3596	460	break;
slouken@3596	461	}
slouken@3596	462	} else {
slouken@3596	463	switch (blendMode) {
slouken@3596	464	case SDL_BLENDMODE_BLEND:
slouken@3596	465	AALINE(x1, y1, x2, y2,
slouken@3596	466	DRAW_SETPIXELXY4_BLEND_RGBA, DRAW_SETPIXELXY4_BLEND_RGBA,
slouken@3596	467	draw_end);
slouken@2898	468	break;
slouken@2898	469	case SDL_BLENDMODE_ADD:
slouken@3596	470	AALINE(x1, y1, x2, y2,
slouken@3596	471	DRAW_SETPIXELXY4_ADD_RGBA, DRAW_SETPIXELXY4_ADD_RGBA,
slouken@3596	472	draw_end);
slouken@3596	473	break;
slouken@5184	474	case SDL_BLENDMODE_MOD:
slouken@5184	475	AALINE(x1, y1, x2, y2,
slouken@5184	476	DRAW_SETPIXELXY4_MOD_RGBA, DRAW_SETPIXELXY4_MOD_RGBA,
slouken@5184	477	draw_end);
slouken@5184	478	break;
slouken@3596	479	default:
slouken@3596	480	AALINE(x1, y1, x2, y2,
slouken@3596	481	DRAW_SETPIXELXY4_RGBA, DRAW_SETPIXELXY4_BLEND_RGBA,
slouken@3596	482	draw_end);
slouken@3596	483	break;
slouken@3596	484	}
slouken@3596	485	}
slouken@3596	486	}
slouken@3596	487
slouken@3596	488	static void
slouken@3596	489	SDL_BlendLine_RGB888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
slouken@4929	490	SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
slouken@3596	491	SDL_bool draw_end)
slouken@3596	492	{
slouken@3596	493	unsigned r, g, b, a, inva;
slouken@3596	494
slouken@3596	495	if (blendMode == SDL_BLENDMODE_BLEND \|\| blendMode == SDL_BLENDMODE_ADD) {
slouken@3596	496	r = DRAW_MUL(_r, _a);
slouken@3596	497	g = DRAW_MUL(_g, _a);
slouken@3596	498	b = DRAW_MUL(_b, _a);
slouken@3596	499	a = _a;
slouken@3596	500	} else {
slouken@3596	501	r = _r;
slouken@3596	502	g = _g;
slouken@3596	503	b = _b;
slouken@3596	504	a = _a;
slouken@3596	505	}
slouken@3596	506	inva = (a ^ 0xff);
slouken@3596	507
slouken@3596	508	if (y1 == y2) {
slouken@3596	509	switch (blendMode) {
slouken@3596	510	case SDL_BLENDMODE_BLEND:
slouken@3596	511	HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB888, draw_end);
slouken@3596	512	break;
slouken@3596	513	case SDL_BLENDMODE_ADD:
slouken@3596	514	HLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end);
slouken@2898	515	break;
slouken@5184	516	case SDL_BLENDMODE_MOD:
slouken@5184	517	HLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
slouken@5184	518	break;
slouken@3596	519	default:
slouken@3596	520	HLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end);
slouken@3596	521	break;
slouken@3596	522	}
slouken@3596	523	} else if (x1 == x2) {
slouken@3596	524	switch (blendMode) {
slouken@3596	525	case SDL_BLENDMODE_BLEND:
slouken@3596	526	VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB888, draw_end);
slouken@3596	527	break;
slouken@3596	528	case SDL_BLENDMODE_ADD:
slouken@3596	529	VLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end);
slouken@3596	530	break;
slouken@5184	531	case SDL_BLENDMODE_MOD:
slouken@5184	532	VLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
slouken@5184	533	break;
slouken@3596	534	default:
slouken@3596	535	VLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end);
slouken@3596	536	break;
slouken@3596	537	}
slouken@3596	538	} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
slouken@3596	539	switch (blendMode) {
slouken@3596	540	case SDL_BLENDMODE_BLEND:
slouken@3596	541	DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB888, draw_end);
slouken@3596	542	break;
slouken@3596	543	case SDL_BLENDMODE_ADD:
slouken@3596	544	DLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end);
slouken@3596	545	break;
slouken@5184	546	case SDL_BLENDMODE_MOD:
slouken@5184	547	DLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
slouken@5184	548	break;
slouken@3596	549	default:
slouken@3596	550	DLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end);
slouken@3596	551	break;
slouken@3596	552	}
slouken@3596	553	} else {
slouken@3596	554	switch (blendMode) {
slouken@3596	555	case SDL_BLENDMODE_BLEND:
slouken@3596	556	AALINE(x1, y1, x2, y2,
slouken@3596	557	DRAW_SETPIXELXY_BLEND_RGB888, DRAW_SETPIXELXY_BLEND_RGB888,
slouken@3596	558	draw_end);
slouken@3596	559	break;
slouken@3596	560	case SDL_BLENDMODE_ADD:
slouken@3596	561	AALINE(x1, y1, x2, y2,
slouken@3596	562	DRAW_SETPIXELXY_ADD_RGB888, DRAW_SETPIXELXY_ADD_RGB888,
slouken@3596	563	draw_end);
slouken@3596	564	break;
slouken@5184	565	case SDL_BLENDMODE_MOD:
slouken@5184	566	AALINE(x1, y1, x2, y2,
slouken@5184	567	DRAW_SETPIXELXY_MOD_RGB888, DRAW_SETPIXELXY_MOD_RGB888,
slouken@5184	568	draw_end);
slouken@5184	569	break;
slouken@2898	570	default:
slouken@3596	571	AALINE(x1, y1, x2, y2,
slouken@3596	572	DRAW_SETPIXELXY_RGB888, DRAW_SETPIXELXY_BLEND_RGB888,
slouken@3596	573	draw_end);
slouken@3596	574	break;
slouken@3596	575	}
slouken@3596	576	}
slouken@3596	577	}
slouken@3596	578
slouken@3596	579	static void
slouken@3596	580	SDL_BlendLine_ARGB8888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
slouken@4929	581	SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
slouken@3596	582	SDL_bool draw_end)
slouken@3596	583	{
slouken@3596	584	unsigned r, g, b, a, inva;
slouken@3596	585
slouken@3596	586	if (blendMode == SDL_BLENDMODE_BLEND \|\| blendMode == SDL_BLENDMODE_ADD) {
slouken@3596	587	r = DRAW_MUL(_r, _a);
slouken@3596	588	g = DRAW_MUL(_g, _a);
slouken@3596	589	b = DRAW_MUL(_b, _a);
slouken@3596	590	a = _a;
slouken@3596	591	} else {
slouken@3596	592	r = _r;
slouken@3596	593	g = _g;
slouken@3596	594	b = _b;
slouken@3596	595	a = _a;
slouken@3596	596	}
slouken@3596	597	inva = (a ^ 0xff);
slouken@3596	598
slouken@3596	599	if (y1 == y2) {
slouken@3596	600	switch (blendMode) {
slouken@3596	601	case SDL_BLENDMODE_BLEND:
slouken@3596	602	HLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end);
slouken@3596	603	break;
slouken@3596	604	case SDL_BLENDMODE_ADD:
slouken@3596	605	HLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end);
slouken@3596	606	break;
slouken@5184	607	case SDL_BLENDMODE_MOD:
slouken@5184	608	HLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
slouken@5184	609	break;
slouken@3596	610	default:
slouken@3596	611	HLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end);
slouken@3596	612	break;
slouken@3596	613	}
slouken@3596	614	} else if (x1 == x2) {
slouken@3596	615	switch (blendMode) {
slouken@3596	616	case SDL_BLENDMODE_BLEND:
slouken@3596	617	VLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end);
slouken@3596	618	break;
slouken@3596	619	case SDL_BLENDMODE_ADD:
slouken@3596	620	VLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end);
slouken@3596	621	break;
slouken@5184	622	case SDL_BLENDMODE_MOD:
slouken@5184	623	VLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
slouken@5184	624	break;
slouken@3596	625	default:
slouken@3596	626	VLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end);
slouken@2898	627	break;
slouken@2898	628	}
slouken@3596	629	} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
slouken@3596	630	switch (blendMode) {
slouken@3596	631	case SDL_BLENDMODE_BLEND:
slouken@3596	632	DLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end);
slouken@3596	633	break;
slouken@3596	634	case SDL_BLENDMODE_ADD:
slouken@3596	635	DLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end);
slouken@3596	636	break;
slouken@5184	637	case SDL_BLENDMODE_MOD:
slouken@5184	638	DLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
slouken@5184	639	break;
slouken@3596	640	default:
slouken@3596	641	DLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end);
slouken@3596	642	break;
slouken@3596	643	}
slouken@3596	644	} else {
slouken@3596	645	switch (blendMode) {
slouken@3596	646	case SDL_BLENDMODE_BLEND:
slouken@3596	647	AALINE(x1, y1, x2, y2,
slouken@3596	648	DRAW_SETPIXELXY_BLEND_ARGB8888, DRAW_SETPIXELXY_BLEND_ARGB8888,
slouken@3596	649	draw_end);
slouken@3596	650	break;
slouken@3596	651	case SDL_BLENDMODE_ADD:
slouken@3596	652	AALINE(x1, y1, x2, y2,
slouken@3596	653	DRAW_SETPIXELXY_ADD_ARGB8888, DRAW_SETPIXELXY_ADD_ARGB8888,
slouken@3596	654	draw_end);
slouken@3596	655	break;
slouken@5184	656	case SDL_BLENDMODE_MOD:
slouken@5184	657	AALINE(x1, y1, x2, y2,
slouken@5184	658	DRAW_SETPIXELXY_MOD_ARGB8888, DRAW_SETPIXELXY_MOD_ARGB8888,
slouken@5184	659	draw_end);
slouken@5184	660	break;
slouken@3596	661	default:
slouken@3596	662	AALINE(x1, y1, x2, y2,
slouken@3596	663	DRAW_SETPIXELXY_ARGB8888, DRAW_SETPIXELXY_BLEND_ARGB8888,
slouken@3596	664	draw_end);
slouken@3596	665	break;
slouken@3596	666	}
slouken@2898	667	}
slouken@2898	668	}
slouken@2888	669
slouken@3596	670	typedef void (BlendLineFunc) (SDL_Surface dst,
slouken@3596	671	int x1, int y1, int x2, int y2,
slouken@4929	672	SDL_BlendMode blendMode,
slouken@3596	673	Uint8 r, Uint8 g, Uint8 b, Uint8 a,
slouken@3596	674	SDL_bool draw_end);
slouken@3596	675
slouken@3596	676	static BlendLineFunc
slouken@3596	677	SDL_CalculateBlendLineFunc(const SDL_PixelFormat * fmt)
slouken@3596	678	{
slouken@3596	679	switch (fmt->BytesPerPixel) {
slouken@3596	680	case 2:
slouken@3596	681	if (fmt->Rmask == 0x7C00) {
slouken@3596	682	return SDL_BlendLine_RGB555;
slouken@3596	683	} else if (fmt->Rmask == 0xF800) {
slouken@3596	684	return SDL_BlendLine_RGB565;
slouken@3596	685	} else {
slouken@3596	686	return SDL_BlendLine_RGB2;
slouken@3596	687	}
slouken@3596	688	break;
slouken@3596	689	case 4:
slouken@3596	690	if (fmt->Rmask == 0x00FF0000) {
slouken@3596	691	if (fmt->Amask) {
slouken@3596	692	return SDL_BlendLine_ARGB8888;
slouken@3596	693	} else {
slouken@3596	694	return SDL_BlendLine_RGB888;
slouken@3596	695	}
slouken@3596	696	} else {
slouken@3596	697	if (fmt->Amask) {
slouken@3596	698	return SDL_BlendLine_RGBA4;
slouken@3596	699	} else {
slouken@3596	700	return SDL_BlendLine_RGB4;
slouken@3596	701	}
slouken@3596	702	}
slouken@3596	703	}
slouken@3596	704	return NULL;
slouken@3596	705	}
slouken@3596	706
slouken@2888	707	int
slouken@2888	708	SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2,
slouken@4929	709	SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
slouken@2888	710	{
slouken@3596	711	BlendLineFunc func;
slouken@3596	712
slouken@3596	713	if (!dst) {
icculus@7037	714	return SDL_SetError("SDL_BlendLine(): Passed NULL destination surface");
slouken@3596	715	}
slouken@3596	716
slouken@3596	717	func = SDL_CalculateBlendLineFunc(dst->format);
slouken@3596	718	if (!func) {
icculus@7037	719	return SDL_SetError("SDL_BlendLine(): Unsupported surface format");
slouken@2888	720	}
slouken@2888	721
slouken@2888	722	/* Perform clipping */
slouken@3596	723	/* FIXME: We don't actually want to clip, as it may change line slope */
slouken@2910	724	if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
slouken@3596	725	return 0;
slouken@2896	726	}
slouken@2898	727
slouken@3596	728	func(dst, x1, y1, x2, y2, blendMode, r, g, b, a, SDL_TRUE);
slouken@3596	729	return 0;
slouken@2888	730	}
slouken@2888	731
slouken@3536	732	int
slouken@3536	733	SDL_BlendLines(SDL_Surface * dst, const SDL_Point * points, int count,
slouken@4929	734	SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
slouken@3536	735	{
slouken@3536	736	int i;
slouken@3536	737	int x1, y1;
slouken@3536	738	int x2, y2;
slouken@3596	739	SDL_bool draw_end;
slouken@3596	740	BlendLineFunc func;
slouken@3536	741
slouken@3536	742	if (!dst) {
icculus@7037	743	return SDL_SetError("SDL_BlendLines(): Passed NULL destination surface");
slouken@3536	744	}
slouken@3536	745
slouken@3596	746	func = SDL_CalculateBlendLineFunc(dst->format);
slouken@3536	747	if (!func) {
icculus@7037	748	return SDL_SetError("SDL_BlendLines(): Unsupported surface format");
slouken@3536	749	}
slouken@3536	750
slouken@3536	751	for (i = 1; i < count; ++i) {
slouken@3536	752	x1 = points[i-1].x;
slouken@3536	753	y1 = points[i-1].y;
slouken@3536	754	x2 = points[i].x;
slouken@3536	755	y2 = points[i].y;
slouken@3536	756
slouken@3536	757	/* Perform clipping */
slouken@3536	758	/* FIXME: We don't actually want to clip, as it may change line slope */
slouken@3536	759	if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
slouken@3536	760	continue;
slouken@3536	761	}
slouken@3536	762
slouken@3596	763	/* Draw the end if it was clipped */
slouken@3596	764	draw_end = (x2 != points[i].x \|\| y2 != points[i].y);
slouken@3596	765
slouken@3596	766	func(dst, x1, y1, x2, y2, blendMode, r, g, b, a, draw_end);
slouken@3594	767	}
slouken@3594	768	if (points[0].x != points[count-1].x \|\| points[0].y != points[count-1].y) {
slouken@3596	769	SDL_BlendPoint(dst, points[count-1].x, points[count-1].y,
slouken@3596	770	blendMode, r, g, b, a);
slouken@3536	771	}
slouken@3596	772	return 0;
slouken@3536	773	}
slouken@3536	774
slouken@5226	775	#endif /* !SDL_RENDER_DISABLED */
slouken@5226	776
slouken@2888	777	/* vi: set ts=4 sw=4 expandtab: */

author	Sam Lantinga
	Tue, 26 May 2015 06:27:46 -0700
changeset 9619	b94b6d0bff0f
parent 8149	681eb46b8ac4
child 9998	f67cf37e9cd4
permissions	-rw-r--r--