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author Miodrag Milanovic <mmicko@gmail.com>2016-02-27 16:28:05 +0100
committer Miodrag Milanovic <mmicko@gmail.com>2016-02-27 16:53:49 +0100
commitcf6dc7d370407914020f3e623719f09c8668c692 (patch)
tree46b3416d091b4c09b50fba7ffcbd310aed032cc8 /3rdparty/SDL2/src/render/software/SDL_drawline.c
parent64135e73f973d9b95beb0c60b65feb34fbfec64a (diff)
Placed SDL2 source since we need it on some platforms (nw)
Diffstat (limited to '3rdparty/SDL2/src/render/software/SDL_drawline.c')
-rw-r--r--3rdparty/SDL2/src/render/software/SDL_drawline.c209
1 files changed, 209 insertions, 0 deletions
diff --git a/3rdparty/SDL2/src/render/software/SDL_drawline.c b/3rdparty/SDL2/src/render/software/SDL_drawline.c
new file mode 100644
index 00000000000..fd50ea748b0
--- /dev/null
+++ b/3rdparty/SDL2/src/render/software/SDL_drawline.c
@@ -0,0 +1,209 @@
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
+
+ This software is provided 'as-is', without any express or implied
+ warranty. In no event will the authors be held liable for any damages
+ arising from the use of this software.
+
+ Permission is granted to anyone to use this software for any purpose,
+ including commercial applications, and to alter it and redistribute it
+ freely, subject to the following restrictions:
+
+ 1. The origin of this software must not be misrepresented; you must not
+ claim that you wrote the original software. If you use this software
+ in a product, an acknowledgment in the product documentation would be
+ appreciated but is not required.
+ 2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+ 3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if !SDL_RENDER_DISABLED
+
+#include "SDL_draw.h"
+#include "SDL_drawline.h"
+#include "SDL_drawpoint.h"
+
+
+static void
+SDL_DrawLine1(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
+ SDL_bool draw_end)
+{
+ if (y1 == y2) {
+ int length;
+ int pitch = (dst->pitch / dst->format->BytesPerPixel);
+ Uint8 *pixel;
+ if (x1 <= x2) {
+ pixel = (Uint8 *)dst->pixels + y1 * pitch + x1;
+ length = draw_end ? (x2-x1+1) : (x2-x1);
+ } else {
+ pixel = (Uint8 *)dst->pixels + y1 * pitch + x2;
+ if (!draw_end) {
+ ++pixel;
+ }
+ length = draw_end ? (x1-x2+1) : (x1-x2);
+ }
+ SDL_memset(pixel, color, length);
+ } else if (x1 == x2) {
+ VLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
+ } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+ DLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
+ } else {
+ BLINE(x1, y1, x2, y2, DRAW_FASTSETPIXELXY1, draw_end);
+ }
+}
+
+static void
+SDL_DrawLine2(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
+ SDL_bool draw_end)
+{
+ if (y1 == y2) {
+ HLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
+ } else if (x1 == x2) {
+ VLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
+ } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+ DLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
+ } else {
+ Uint8 _r, _g, _b, _a;
+ const SDL_PixelFormat * fmt = dst->format;
+ SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
+ if (fmt->Rmask == 0x7C00) {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB555,
+ draw_end);
+ } else if (fmt->Rmask == 0xF800) {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB565,
+ draw_end);
+ } else {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB,
+ draw_end);
+ }
+ }
+}
+
+static void
+SDL_DrawLine4(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
+ SDL_bool draw_end)
+{
+ if (y1 == y2) {
+ HLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
+ } else if (x1 == x2) {
+ VLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
+ } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+ DLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
+ } else {
+ Uint8 _r, _g, _b, _a;
+ const SDL_PixelFormat * fmt = dst->format;
+ SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
+ if (fmt->Rmask == 0x00FF0000) {
+ if (!fmt->Amask) {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_RGB888,
+ draw_end);
+ } else {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_ARGB8888,
+ draw_end);
+ }
+ } else {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB,
+ draw_end);
+ }
+ }
+}
+
+typedef void (*DrawLineFunc) (SDL_Surface * dst,
+ int x1, int y1, int x2, int y2,
+ Uint32 color, SDL_bool draw_end);
+
+static DrawLineFunc
+SDL_CalculateDrawLineFunc(const SDL_PixelFormat * fmt)
+{
+ switch (fmt->BytesPerPixel) {
+ case 1:
+ if (fmt->BitsPerPixel < 8) {
+ break;
+ }
+ return SDL_DrawLine1;
+ case 2:
+ return SDL_DrawLine2;
+ case 4:
+ return SDL_DrawLine4;
+ }
+ return NULL;
+}
+
+int
+SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
+{
+ DrawLineFunc func;
+
+ if (!dst) {
+ return SDL_SetError("SDL_DrawLine(): Passed NULL destination surface");
+ }
+
+ func = SDL_CalculateDrawLineFunc(dst->format);
+ if (!func) {
+ return SDL_SetError("SDL_DrawLine(): Unsupported surface format");
+ }
+
+ /* Perform clipping */
+ /* FIXME: We don't actually want to clip, as it may change line slope */
+ if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
+ return 0;
+ }
+
+ func(dst, x1, y1, x2, y2, color, SDL_TRUE);
+ return 0;
+}
+
+int
+SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
+ Uint32 color)
+{
+ int i;
+ int x1, y1;
+ int x2, y2;
+ SDL_bool draw_end;
+ DrawLineFunc func;
+
+ if (!dst) {
+ return SDL_SetError("SDL_DrawLines(): Passed NULL destination surface");
+ }
+
+ func = SDL_CalculateDrawLineFunc(dst->format);
+ if (!func) {
+ return SDL_SetError("SDL_DrawLines(): Unsupported surface format");
+ }
+
+ for (i = 1; i < count; ++i) {
+ x1 = points[i-1].x;
+ y1 = points[i-1].y;
+ x2 = points[i].x;
+ y2 = points[i].y;
+
+ /* Perform clipping */
+ /* FIXME: We don't actually want to clip, as it may change line slope */
+ if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
+ continue;
+ }
+
+ /* Draw the end if it was clipped */
+ draw_end = (x2 != points[i].x || y2 != points[i].y);
+
+ func(dst, x1, y1, x2, y2, color, draw_end);
+ }
+ if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
+ SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color);
+ }
+ return 0;
+}
+
+#endif /* !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */