mirror of https://github.com/OpenRCT2/OpenRCT2.git
Rewrote gfx_draw_line_on_buffer after realising how it works
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cd8587243c
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45532da9c6
126
src/gfx.c
126
src/gfx.c
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@ -99,43 +99,46 @@ void gfx_draw_pixel(rct_drawpixelinfo *dpi, int x, int y, int colour)
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}
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/*
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* Draws a horizontal line of specified colour to a buffer.
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* rct2: 0x68474C
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*/
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void gfx_draw_line_on_buffer(int edi, int ebp, int esi)
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void gfx_draw_line_on_buffer(rct_drawpixelinfo *dpi, char colour, int y, int x, int no_pixels)
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{
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//edi ebp
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//int edi, ebp, esi;
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edi -= RCT2_GLOBAL(0x9ABDBE, sint16);
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y -= dpi->y;
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if (edi < 0)return;
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if (edi >= RCT2_GLOBAL(0x9ABDC2, sint16))return;
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//Check to make sure point is in the y range
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if (y < 0)return;
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if (y >= dpi->height)return;
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//Check to make sure we are drawing at least a pixel
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if (!no_pixels) return;
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if (!ebp) return;
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no_pixels++;
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x -= dpi->x;
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ebp++;
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esi -= RCT2_GLOBAL(0x9ABDBC, sint16);
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if (esi < 0){
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ebp += esi;
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if (ebp <= 0)return;
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esi = 0;
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//If x coord outside range leave
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if (x < 0){
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//Unless the number of pixels is enough to be in range
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no_pixels += x;
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if (no_pixels <= 0)return;
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//Resets starting point to 0 as we don't draw outside the range
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x = 0;
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}
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int eax = esi;
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eax += ebp;
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eax -= RCT2_GLOBAL(0x9ABDC0, sint16);
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if (eax > 0){
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ebp -= eax;
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return;
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//Ensure that the end point of the line is within range
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if (x + no_pixels - dpi->width > 0){
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//If the end point has any pixels outside range
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//cut them off. If there are now no pixels return.
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no_pixels -= x + no_pixels - dpi->width;
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if (no_pixels <= 0)return;
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}
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eax = RCT2_GLOBAL(0x9ABDC4, sint16);
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eax += RCT2_GLOBAL(0x9ABDC0, sint16);
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edi *= eax;
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edi += esi;
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edi += RCT2_GLOBAL(0x9ABDB8, sint32);
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eax = RCT2_GLOBAL(0xEDF84A,uint16);
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for (int i = 0; i < ebp; ++i){
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*((uint8*)edi) = eax;
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edi++;
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char* bits_pointer;
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//Get the buffer we are drawing to and move to the first coordinate.
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bits_pointer = dpi->bits + y*(dpi->pitch + dpi->width) + x;
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//Draw the line to the specified colour
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for (; no_pixels > 0; --no_pixels, ++bits_pointer){
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*((uint8*)bits_pointer) = colour;
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}
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}
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@ -153,6 +156,7 @@ void gfx_draw_line_on_buffer(int edi, int ebp, int esi)
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void gfx_draw_line(rct_drawpixelinfo *dpi, int x1, int y1, int x2, int y2, int colour)
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{
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//RCT2_CALLPROC_X(0x00684466, x1, y1, x2, y2, 0, dpi, colour);
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//return;
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if ((x1 < dpi->x) && (x2 < dpi->x)){
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return;//jump to 0x68474B
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@ -162,11 +166,11 @@ void gfx_draw_line(rct_drawpixelinfo *dpi, int x1, int y1, int x2, int y2, int c
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return;//jump to 0x68474B
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}
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if ((x1 <= (dpi->x + dpi->width)) && (x2 <= (dpi->x + dpi->width))){
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if ((x1 > (dpi->x + dpi->width)) && (x2 > (dpi->x + dpi->width))){
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return;//jump to 0x68474B
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}
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if ((y1 <= (dpi->y + dpi->height)) && (y2 <= (dpi->y + dpi->height))){
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if ((y1 > (dpi->y + dpi->height)) && (y2 > (dpi->y + dpi->height))){
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return;//jump to 0x68474B
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}
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@ -184,41 +188,67 @@ void gfx_draw_line(rct_drawpixelinfo *dpi, int x1, int y1, int x2, int y2, int c
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int edi = y1;
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int esi = x1;
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int ebp = colour & 0xFFFF;
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int cx = x2 - x1;
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if (cx < 0){
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//jump 0x684633
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int x_diff, y_diff;
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x_diff = x2 - x1;
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if (x1 > x2){
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x_diff = -x_diff;
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int ax = x_diff;
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int dx = y2 - y1;
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if (dx < 0){
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RCT2_CALLPROC_X(0x6846C5, ax, x2, x_diff, dx, esi, edi, ebp);
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return;
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//jump 0x6846C5
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}
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RCT2_GLOBAL(0xEDF846, uint16) = x_diff;
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RCT2_GLOBAL(0xEDF848, uint16) = y2 - y1;
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if (dx > x_diff){
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RCT2_CALLPROC_X(0x684691, ax, x2, x_diff, dx, esi, edi, ebp);
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return;
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//jump 0x684691
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}
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ax--;
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if (ax < 0)return;
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x_diff /= 2;
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x_diff = -x_diff;
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ebp = 0;
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return;//not finished
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}
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int ax = cx;
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int dx = y2 - y1;
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if (dx < 0){
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int ax = x_diff;
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y_diff = y2 - y1;
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if (y1 > y2){
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RCT2_CALLPROC_X(0x6845AB, ax, x2, x_diff, y_diff, esi, edi, ebp);
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return;
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//jump 0x6845AB
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}
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RCT2_GLOBAL(0xEDF846, uint16) = cx;
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RCT2_GLOBAL(0xEDF848, uint16) = dx;
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if (dx > cx){
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RCT2_GLOBAL(0xEDF846, uint16) = x_diff;
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RCT2_GLOBAL(0xEDF848, uint16) = y_diff;
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if ((y2 - y1) > (x2 - x1)){
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RCT2_CALLPROC_X(0x68456A, ax, x2, x_diff, y_diff, esi, edi, ebp);
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return;
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//jump 0x68456A
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}
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ax--;
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if (ax < 0){
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RCT2_CALLPROC_X(0x684568, ax, x2, x_diff, y_diff, esi, edi, ebp);
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return;//jump 0x684568
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}
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cx /= 2;
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cx = -cx;
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x_diff /= 2;
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x_diff = -x_diff;
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ebp = 0;
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for (int i = ax; i >= 0; i--){
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ebp++;
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cx += RCT2_GLOBAL(0xEDF848, sint16);
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if (cx <= 0){
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i--;
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if (i < 0){
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gfx_draw_line_on_buffer(edi, ebp, esi);
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x_diff += y_diff;
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if (x_diff <= 0){
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if (i-1 < 0){
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gfx_draw_line_on_buffer(dpi, (uint16)(0xFFFF & colour), edi, ebp, esi);
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return;
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}
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continue;
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}
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cx -= RCT2_GLOBAL(0xEDF846, sint16);
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gfx_draw_line_on_buffer(edi, ebp, esi);
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x_diff -= x2 - x1;
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gfx_draw_line_on_buffer(dpi, (uint16)(0xFFFF & colour), edi, ebp, esi);
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esi += ebp;
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edi++;
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ebp = 0;
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@ -2139,7 +2139,6 @@ static void window_park_graph_draw_months(rct_drawpixelinfo *dpi, uint8 *history
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static void window_park_graph_draw_line_a(rct_drawpixelinfo *dpi, uint8 *history, int baseX, int baseY)
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{
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int i, x, y, lastX, lastY;
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lastX = -1;
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x = baseX;
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for (i = 31; i >= 0; i--) {
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