/* $Id: drawpix.c,v 1.13 2000/03/03 15:39:13 brianp Exp $ */ /* * Mesa 3-D graphics library * Version: 3.3 * * Copyright (C) 1999-2000 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifdef PC_HEADER #include "all.h" #else #include "glheader.h" #include "context.h" #include "drawpix.h" #include "feedback.h" #include "image.h" #include "macros.h" #include "mmath.h" #include "pixel.h" #include "span.h" #include "state.h" #include "stencil.h" #include "types.h" #include "zoom.h" #endif /* * Given the dest position, size and skipPixels and skipRows values * for a glDrawPixels command, perform clipping of the image bounds * so the result lies withing the context's buffer bounds. * Return: GL_TRUE if image is ready for drawing * GL_FALSE if image was completely clipped away (draw nothing) */ GLboolean _mesa_clip_pixelrect(const GLcontext *ctx, GLint *destX, GLint *destY, GLsizei *width, GLsizei *height, GLint *skipPixels, GLint *skipRows) { const GLframebuffer *buffer = ctx->DrawBuffer; /* left clipping */ if (*destX < buffer->Xmin) { *skipPixels += (buffer->Xmin - *destX); *width -= (buffer->Xmin - *destX); *destX = buffer->Xmin; } /* right clipping */ if (*destX + *width > buffer->Xmax) *width -= (*destX + *width - buffer->Xmax - 1); if (*width <= 0) return GL_FALSE; /* bottom clipping */ if (*destY < buffer->Ymin) { *skipRows += (buffer->Ymin - *destY); *height -= (buffer->Ymin - *destY); *destY = buffer->Ymin; } /* top clipping */ if (*destY + *height > buffer->Ymax) *height -= (*destY + *height - buffer->Ymax - 1); if (*height <= 0) return GL_TRUE; return GL_TRUE; } /* * Try to do a fast and simple RGB(a) glDrawPixels. * Return: GL_TRUE if success, GL_FALSE if slow path must be used instead */ static GLboolean simple_DrawPixels( GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels ) { const struct gl_pixelstore_attrib *unpack = &ctx->Unpack; GLubyte rgb[MAX_WIDTH][3]; GLubyte rgba[MAX_WIDTH][4]; ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glDrawPixels", GL_FALSE); if (!ctx->Current.RasterPosValid) { /* no-op */ return GL_TRUE; } if (ctx->NewState) { gl_update_state(ctx); } if ((ctx->RasterMask&(~(SCISSOR_BIT|WINCLIP_BIT)))==0 && ctx->Pixel.RedBias==0.0 && ctx->Pixel.RedScale==1.0 && ctx->Pixel.GreenBias==0.0 && ctx->Pixel.GreenScale==1.0 && ctx->Pixel.BlueBias==0.0 && ctx->Pixel.BlueScale==1.0 && ctx->Pixel.AlphaBias==0.0 && ctx->Pixel.AlphaScale==1.0 && ctx->Pixel.IndexShift==0 && ctx->Pixel.IndexOffset==0 && ctx->Pixel.MapColorFlag==0 && unpack->Alignment==1 && !unpack->SwapBytes && !unpack->LsbFirst) { GLint destX = x; GLint destY = y; GLint drawWidth = width; /* actual width drawn */ GLint drawHeight = height; /* actual height drawn */ GLint skipPixels = unpack->SkipPixels; GLint skipRows = unpack->SkipRows; GLint rowLength; GLdepth zSpan[MAX_WIDTH]; /* only used when zooming */ GLint zoomY0; if (unpack->RowLength > 0) rowLength = unpack->RowLength; else rowLength = width; /* If we're not using pixel zoom then do all clipping calculations * now. Otherwise, we'll let the gl_write_zoomed_*_span() functions * handle the clipping. */ if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) { /* horizontal clipping */ if (destX < ctx->DrawBuffer->Xmin) { skipPixels += (ctx->DrawBuffer->Xmin - destX); drawWidth -= (ctx->DrawBuffer->Xmin - destX); destX = ctx->DrawBuffer->Xmin; } if (destX + drawWidth > ctx->DrawBuffer->Xmax) drawWidth -= (destX + drawWidth - ctx->DrawBuffer->Xmax - 1); if (drawWidth <= 0) return GL_TRUE; /* vertical clipping */ if (destY < ctx->DrawBuffer->Ymin) { skipRows += (ctx->DrawBuffer->Ymin - destY); drawHeight -= (ctx->DrawBuffer->Ymin - destY); destY = ctx->DrawBuffer->Ymin; } if (destY + drawHeight > ctx->DrawBuffer->Ymax) drawHeight -= (destY + drawHeight - ctx->DrawBuffer->Ymax - 1); if (drawHeight <= 0) return GL_TRUE; zoomY0 = 0; /* not used - silence compiler warning */ } else { /* setup array of fragment Z value to pass to zoom function */ GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * DEPTH_SCALE); GLint i; assert(drawWidth < MAX_WIDTH); for (i=0; iCurrent.RasterPos[1] + 0.5F); } /* * Ready to draw! * The window region at (destX, destY) of size (drawWidth, drawHeight) * will be written to. * We'll take pixel data from buffer pointed to by "pixels" but we'll * skip "skipRows" rows and skip "skipPixels" pixels/row. */ if (format==GL_RGBA && type==GL_UNSIGNED_BYTE) { if (ctx->Visual->RGBAflag) { GLubyte *src = (GLubyte *) pixels + (skipRows * rowLength + skipPixels) * 4; if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) { /* no zooming */ GLint row; for (row=0; rowDriver.WriteRGBASpan)(ctx, drawWidth, destX, destY, (void *) src, NULL); src += rowLength * 4; destY++; } } else { /* with zooming */ GLint row; for (row=0; rowVisual->RGBAflag) { GLubyte *src = (GLubyte *) pixels + (skipRows * rowLength + skipPixels) * 3; if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) { GLint row; for (row=0; rowDriver.WriteRGBSpan)(ctx, drawWidth, destX, destY, (void *) src, NULL); src += rowLength * 3; destY++; } } else { /* with zooming */ GLint row; for (row=0; rowVisual->RGBAflag) { GLubyte *src = (GLubyte *) pixels + (skipRows * rowLength + skipPixels); if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) { /* no zooming */ GLint row; assert(drawWidth < MAX_WIDTH); for (row=0; rowDriver.WriteRGBSpan)(ctx, drawWidth, destX, destY, (void *) rgb, NULL); src += rowLength; destY++; } } else { /* with zooming */ GLint row; assert(drawWidth < MAX_WIDTH); for (row=0; rowVisual->RGBAflag) { GLubyte *src = (GLubyte *) pixels + (skipRows * rowLength + skipPixels)*2; if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) { /* no zooming */ GLint row; assert(drawWidth < MAX_WIDTH); for (row=0; rowDriver.WriteRGBASpan)(ctx, drawWidth, destX, destY, (void *) rgba, NULL); src += rowLength*2; destY++; } } else { /* with zooming */ GLint row; assert(drawWidth < MAX_WIDTH); for (row=0; rowVisual->RGBAflag) { /* convert CI data to RGBA */ if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) { /* no zooming */ GLint row; for (row=0; rowDriver.WriteRGBASpan)(ctx, drawWidth, destX, destY, (const GLubyte (*)[4])rgba, NULL); src += rowLength; destY++; } return GL_TRUE; } else { /* with zooming */ GLint row; for (row=0; rowPixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) { /* no zooming */ for (row=0; rowDriver.WriteCI8Span)(ctx, drawWidth, destX, destY, src, NULL); src += rowLength; destY++; } return GL_TRUE; } else { /* with zooming */ return GL_FALSE; } } } else { /* can't handle this pixel format and/or data type here */ return GL_FALSE; } } /* can't do a simple draw, have to use slow path */ return GL_FALSE; } /* * Do glDrawPixels of index pixels. */ static void draw_index_pixels( GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height, GLenum type, const GLvoid *pixels ) { const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0; const GLint desty = y; GLint row, drawWidth; GLdepth zspan[MAX_WIDTH]; drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width; /* Fragment depth values */ if (ctx->Depth.Test || ctx->Fog.Enabled) { GLdepth zval = (GLdepth) (ctx->Current.RasterPos[2] * DEPTH_SCALE); GLint i; for (i = 0; i < drawWidth; i++) { zspan[i] = zval; } } /* * General solution */ for (row = 0; row < height; row++, y++) { GLuint indexes[MAX_WIDTH]; const GLvoid *source = gl_pixel_addr_in_image(&ctx->Unpack, pixels, width, height, GL_COLOR_INDEX, type, 0, row, 0); _mesa_unpack_index_span(ctx, drawWidth, GL_UNSIGNED_INT, indexes, type, source, &ctx->Unpack, GL_TRUE); if (zoom) { gl_write_zoomed_index_span(ctx, drawWidth, x, y, zspan, indexes, desty); } else { gl_write_index_span(ctx, drawWidth, x, y, zspan, indexes, GL_BITMAP); } } } /* * Do glDrawPixels of stencil image. The image datatype may either * be GLubyte or GLbitmap. */ static void draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height, GLenum type, const GLvoid *pixels ) { const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0; const GLint desty = y; GLint row, drawWidth; if (type != GL_BYTE && type != GL_UNSIGNED_BYTE && type != GL_SHORT && type != GL_UNSIGNED_SHORT && type != GL_INT && type != GL_UNSIGNED_INT && type != GL_FLOAT && type != GL_BITMAP) { gl_error( ctx, GL_INVALID_ENUM, "glDrawPixels(stencil type)"); return; } drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width; for (row = 0; row < height; row++, y++) { GLstencil values[MAX_WIDTH]; GLenum destType = (sizeof(GLstencil) == sizeof(GLubyte)) ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT; const GLvoid *source = gl_pixel_addr_in_image(&ctx->Unpack, pixels, width, height, GL_COLOR_INDEX, type, 0, row, 0); _mesa_unpack_index_span(ctx, drawWidth, destType, values, type, source, &ctx->Unpack, GL_TRUE); if (zoom) { gl_write_zoomed_stencil_span( ctx, (GLuint) drawWidth, x, y, values, desty ); } else { gl_write_stencil_span( ctx, (GLuint) drawWidth, x, y, values ); } } } /* * Do a glDrawPixels of depth values. */ static void draw_depth_pixels( GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height, GLenum type, const GLvoid *pixels ) { const GLboolean bias_or_scale = ctx->Pixel.DepthBias!=0.0 || ctx->Pixel.DepthScale!=1.0; const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0; const GLint desty = y; GLubyte rgba[MAX_WIDTH][4]; GLuint ispan[MAX_WIDTH]; GLint drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width; if (type != GL_UNSIGNED_BYTE && type != GL_UNSIGNED_BYTE && type != GL_UNSIGNED_SHORT && type != GL_UNSIGNED_SHORT && type != GL_UNSIGNED_INT && type != GL_UNSIGNED_INT && type != GL_FLOAT) { gl_error(ctx, GL_INVALID_ENUM, "glDrawPixels(type)"); return; } /* Colors or indexes */ if (ctx->Visual->RGBAflag) { GLint r = (GLint) (ctx->Current.RasterColor[0] * 255.0F); GLint g = (GLint) (ctx->Current.RasterColor[1] * 255.0F); GLint b = (GLint) (ctx->Current.RasterColor[2] * 255.0F); GLint a = (GLint) (ctx->Current.RasterColor[3] * 255.0F); GLint i; for (i = 0; i < drawWidth; i++) { rgba[i][RCOMP] = r; rgba[i][GCOMP] = g; rgba[i][BCOMP] = b; rgba[i][ACOMP] = a; } } else { GLint i; for (i = 0; i < drawWidth; i++) { ispan[i] = ctx->Current.RasterIndex; } } if (type==GL_UNSIGNED_SHORT && sizeof(GLdepth)==sizeof(GLushort) && !bias_or_scale && !zoom && ctx->Visual->RGBAflag) { /* Special case: directly write 16-bit depth values */ GLint row; for (row = 0; row < height; row++, y++) { const GLdepth *zptr = gl_pixel_addr_in_image(&ctx->Unpack, pixels, width, height, GL_DEPTH_COMPONENT, type, 0, row, 0); gl_write_rgba_span( ctx, width, x, y, zptr, rgba, GL_BITMAP ); } } else if (type==GL_UNSIGNED_INT && sizeof(GLdepth)==sizeof(GLuint) && !bias_or_scale && !zoom && ctx->Visual->RGBAflag) { /* Special case: directly write 32-bit depth values */ GLint i, row; /* Compute shift value to scale 32-bit uints down to depth values. */ GLuint shift = 0; GLuint max = MAX_DEPTH; while ((max & 0x80000000) == 0) { max = max << 1; shift++; } for (row = 0; row < height; row++, y++) { GLdepth zspan[MAX_WIDTH]; const GLdepth *zptr = gl_pixel_addr_in_image(&ctx->Unpack, pixels, width, height, GL_DEPTH_COMPONENT, type, 0, row, 0); for (i=0;i> shift; } gl_write_rgba_span( ctx, width, x, y, zspan, rgba, GL_BITMAP ); } } else { /* General case */ GLint row; for (row = 0; row < height; row++, y++) { GLdepth zspan[MAX_WIDTH]; const GLvoid *src = gl_pixel_addr_in_image(&ctx->Unpack, pixels, width, height, GL_DEPTH_COMPONENT, type, 0, row, 0); _mesa_unpack_depth_span( ctx, drawWidth, zspan, type, src, &ctx->Unpack, GL_TRUE ); if (ctx->Visual->RGBAflag) { if (zoom) { gl_write_zoomed_rgba_span(ctx, width, x, y, zspan, (const GLubyte (*)[4])rgba, desty); } else { gl_write_rgba_span(ctx, width, x, y, zspan, rgba, GL_BITMAP); } } else { if (zoom) { gl_write_zoomed_index_span(ctx, width, x, y, zspan, ispan, GL_BITMAP); } else { gl_write_index_span(ctx, width, x, y, zspan, ispan, GL_BITMAP); } } } } } /* * Do glDrawPixels of RGBA pixels. */ static void draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels ) { const struct gl_pixelstore_attrib *unpack = &ctx->Unpack; const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0; const GLint desty = y; GLdepth zspan[MAX_WIDTH]; GLboolean quickDraw; /* Try an optimized glDrawPixels first */ if (simple_DrawPixels(ctx, x, y, width, height, format, type, pixels)) return; /* Fragment depth values */ if (ctx->Depth.Test || ctx->Fog.Enabled) { /* fill in array of z values */ GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * DEPTH_SCALE); GLint i; for (i=0;iRasterMask == 0 && !zoom && x >= 0 && y >= 0 && x + width <= ctx->DrawBuffer->Width && y + height <= ctx->DrawBuffer->Height) { quickDraw = GL_TRUE; } else { quickDraw = GL_FALSE; } /* * General solution */ { GLubyte rgba[MAX_WIDTH][4]; GLint row; if (width > MAX_WIDTH) width = MAX_WIDTH; for (row = 0; row < height; row++, y++) { const GLvoid *source = gl_pixel_addr_in_image(unpack, pixels, width, height, format, type, 0, row, 0); _mesa_unpack_ubyte_color_span(ctx, width, GL_RGBA, (void*) rgba, format, type, source, unpack, GL_TRUE); if (quickDraw) { (*ctx->Driver.WriteRGBASpan)( ctx, width, x, y, (CONST GLubyte (*)[]) rgba, NULL); } else if (zoom) { gl_write_zoomed_rgba_span( ctx, width, x, y, zspan, (CONST GLubyte (*)[]) rgba, desty ); } else { gl_write_rgba_span( ctx, (GLuint) width, x, y, zspan, rgba, GL_BITMAP); } } } } /* * Execute glDrawPixels */ void _mesa_DrawPixels( GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels ) { GET_CURRENT_CONTEXT(ctx); ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glDrawPixels"); if (ctx->RenderMode==GL_RENDER) { GLint x, y; if (!pixels || !ctx->Current.RasterPosValid) { return; } x = (GLint) (ctx->Current.RasterPos[0] + 0.5F); y = (GLint) (ctx->Current.RasterPos[1] + 0.5F); /* see if device driver can do the drawpix */ if (ctx->Driver.DrawPixels && (*ctx->Driver.DrawPixels)(ctx, x, y, width, height, format, type, &ctx->Unpack, pixels)) { return; } switch (format) { case GL_STENCIL_INDEX: draw_stencil_pixels( ctx, x, y, width, height, type, pixels ); break; case GL_DEPTH_COMPONENT: draw_depth_pixels( ctx, x, y, width, height, type, pixels ); break; case GL_COLOR_INDEX: if (ctx->Visual->RGBAflag) draw_rgba_pixels(ctx, x,y, width, height, format, type, pixels); else draw_index_pixels(ctx, x, y, width, height, type, pixels); break; case GL_RED: case GL_GREEN: case GL_BLUE: case GL_ALPHA: case GL_LUMINANCE: case GL_LUMINANCE_ALPHA: case GL_RGB: case GL_BGR: case GL_RGBA: case GL_BGRA: case GL_ABGR_EXT: draw_rgba_pixels(ctx, x, y, width, height, format, type, pixels); break; default: gl_error( ctx, GL_INVALID_ENUM, "glDrawPixels(format)" ); return; } } else if (ctx->RenderMode==GL_FEEDBACK) { if (ctx->Current.RasterPosValid) { GLfloat color[4]; GLfloat texcoord[4], invq; UBYTE_RGBA_TO_FLOAT_RGBA(color, ctx->Current.ByteColor); invq = 1.0F / ctx->Current.Texcoord[0][3]; texcoord[0] = ctx->Current.Texcoord[0][0] * invq; texcoord[1] = ctx->Current.Texcoord[0][1] * invq; texcoord[2] = ctx->Current.Texcoord[0][2] * invq; texcoord[3] = ctx->Current.Texcoord[0][3]; FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN ); gl_feedback_vertex( ctx, ctx->Current.RasterPos, color, ctx->Current.Index, texcoord ); } } else if (ctx->RenderMode==GL_SELECT) { if (ctx->Current.RasterPosValid) { gl_update_hitflag( ctx, ctx->Current.RasterPos[2] ); } } }