text: /*
   * Mesa 3-D graphics library
   *
   * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
   * Copyright (C) 2009  VMware, Inc.  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
   * THE AUTHORS OR COPYRIGHT HOLDERS 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.
   */
  
  #include <stdio.h>
  #include "errors.h"
  #include "mtypes.h"
  #include "attrib.h"
  #include "enums.h"
  #include "formats.h"
  #include "hash.h"
  
  #include "macros.h"
  #include "debug.h"
  #include "get.h"
  #include "pixelstore.h"
  #include "readpix.h"
  #include "texobj.h"
  
  
  static const char *
  tex_target_name(GLenum tgt)
  {
     static const struct {
        GLenum target;
        const char *name;
     } tex_targets[] = {
        { GL_TEXTURE_1D, "GL_TEXTURE_1D" },
        { GL_TEXTURE_2D, "GL_TEXTURE_2D" },
        { GL_TEXTURE_3D, "GL_TEXTURE_3D" },
        { GL_TEXTURE_CUBE_MAP, "GL_TEXTURE_CUBE_MAP" },
        { GL_TEXTURE_RECTANGLE, "GL_TEXTURE_RECTANGLE" },
        { GL_TEXTURE_1D_ARRAY_EXT, "GL_TEXTURE_1D_ARRAY" },
        { GL_TEXTURE_2D_ARRAY_EXT, "GL_TEXTURE_2D_ARRAY" },
        { GL_TEXTURE_CUBE_MAP_ARRAY, "GL_TEXTURE_CUBE_MAP_ARRAY" },
        { GL_TEXTURE_BUFFER, "GL_TEXTURE_BUFFER" },
        { GL_TEXTURE_2D_MULTISAMPLE, "GL_TEXTURE_2D_MULTISAMPLE" },
        { GL_TEXTURE_2D_MULTISAMPLE_ARRAY, "GL_TEXTURE_2D_MULTISAMPLE_ARRAY" },
        { GL_TEXTURE_EXTERNAL_OES, "GL_TEXTURE_EXTERNAL_OES" }
     };
     GLuint i;
     STATIC_ASSERT(ARRAY_SIZE(tex_targets) == NUM_TEXTURE_TARGETS);
     for (i = 0; i < ARRAY_SIZE(tex_targets); i++) {
        if (tex_targets[i].target == tgt)
           return tex_targets[i].name;
     }
     return "UNKNOWN TEX TARGET";
  }
  
  
  void
  _mesa_print_state( const char *msg, GLuint state )
  {
     _mesa_debug(NULL,
  	   "%s: (0x%x) %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
  	   msg,
  	   state,
  	   (state & _NEW_MODELVIEW)       ? "ctx->ModelView, " : "",
  	   (state & _NEW_PROJECTION)      ? "ctx->Projection, " : "",
  	   (state & _NEW_TEXTURE_MATRIX)  ? "ctx->TextureMatrix, " : "",
  	   (state & _NEW_COLOR)           ? "ctx->Color, " : "",
  	   (state & _NEW_DEPTH)           ? "ctx->Depth, " : "",
  	   (state & _NEW_FOG)             ? "ctx->Fog, " : "",
  	   (state & _NEW_HINT)            ? "ctx->Hint, " : "",
  	   (state & _NEW_LIGHT)           ? "ctx->Light, " : "",
  	   (state & _NEW_LINE)            ? "ctx->Line, " : "",
  	   (state & _NEW_PIXEL)           ? "ctx->Pixel, " : "",
  	   (state & _NEW_POINT)           ? "ctx->Point, " : "",
  	   (state & _NEW_POLYGON)         ? "ctx->Polygon, " : "",
  	   (state & _NEW_POLYGONSTIPPLE)  ? "ctx->PolygonStipple, " : "",
  	   (state & _NEW_SCISSOR)         ? "ctx->Scissor, " : "",
  	   (state & _NEW_STENCIL)         ? "ctx->Stencil, " : "",
  	   (state & _NEW_TEXTURE_OBJECT)  ? "ctx->Texture(Object), " : "",
  	   (state & _NEW_TRANSFORM)       ? "ctx->Transform, " : "",
  	   (state & _NEW_VIEWPORT)        ? "ctx->Viewport, " : "",
             (state & _NEW_TEXTURE_STATE)   ? "ctx->Texture(State), " : "",
  	   (state & _NEW_RENDERMODE)      ? "ctx->RenderMode, " : "",
  	   (state & _NEW_BUFFERS)         ? "ctx->Visual, ctx->DrawBuffer,, " : "");
  }
  
  
  
  /**
   * Print information about this Mesa version and build options.
   */
  void _mesa_print_info( struct gl_context *ctx )
  {
     _mesa_debug(NULL, "Mesa GL_VERSION = %s\n",
  	   (char *) _mesa_GetString(GL_VERSION));
     _mesa_debug(NULL, "Mesa GL_RENDERER = %s\n",
  	   (char *) _mesa_GetString(GL_RENDERER));
     _mesa_debug(NULL, "Mesa GL_VENDOR = %s\n",
  	   (char *) _mesa_GetString(GL_VENDOR));
  
     /* use ctx as GL_EXTENSIONS will not work on 3.0 or higher
      * core contexts.
      */
     _mesa_debug(NULL, "Mesa GL_EXTENSIONS = %s\n", ctx->Extensions.String);
  
  #if defined(USE_X86_ASM)
     _mesa_debug(NULL, "Mesa x86-optimized: YES\n");
  #else
     _mesa_debug(NULL, "Mesa x86-optimized: NO\n");
  #endif
  #if defined(USE_SPARC_ASM)
     _mesa_debug(NULL, "Mesa sparc-optimized: YES\n");
  #else
     _mesa_debug(NULL, "Mesa sparc-optimized: NO\n");
  #endif
  }
  
  
  /**
   * Set verbose logging flags.  When these flags are set, GL API calls
   * in the various categories will be printed to stderr.
   * \param str  a comma-separated list of keywords
   */
  static void
  set_verbose_flags(const char *str)
  {
  #ifndef NDEBUG
     struct option {
        const char *name;
        GLbitfield flag;
     };
     static const struct option opts[] = {
        { "varray",    VERBOSE_VARRAY },
        { "tex",       VERBOSE_TEXTURE },
        { "mat",       VERBOSE_MATERIAL },
        { "pipe",      VERBOSE_PIPELINE },
        { "driver",    VERBOSE_DRIVER },
        { "state",     VERBOSE_STATE },
        { "api",       VERBOSE_API },
        { "list",      VERBOSE_DISPLAY_LIST },
        { "lighting",  VERBOSE_LIGHTING },
        { "disassem",  VERBOSE_DISASSEM },
        { "swap",      VERBOSE_SWAPBUFFERS }
     };
     GLuint i;
  
     if (!str)
        return;
  
     MESA_VERBOSE = 0x0;
     for (i = 0; i < ARRAY_SIZE(opts); i++) {
        if (strstr(str, opts[i].name) || strcmp(str, "all") == 0)
           MESA_VERBOSE |= opts[i].flag;
     }
  #endif
  }
  
  
  /**
   * Set debugging flags.  When these flags are set, Mesa will do additional
   * debug checks or actions.
   * \param str  a comma-separated list of keywords
   */
  static void
  set_debug_flags(const char *str)
  {
  #ifndef NDEBUG
     struct option {
        const char *name;
        GLbitfield flag;
     };
     static const struct option opts[] = {
        { "silent", DEBUG_SILENT }, /* turn off debug messages */
        { "flush", DEBUG_ALWAYS_FLUSH }, /* flush after each drawing command */
        { "incomplete_tex", DEBUG_INCOMPLETE_TEXTURE },
        { "incomplete_fbo", DEBUG_INCOMPLETE_FBO },
        { "context", DEBUG_CONTEXT } /* force set GL_CONTEXT_FLAG_DEBUG_BIT flag */
     };
     GLuint i;
  
     if (!str)
        return;
  
     MESA_DEBUG_FLAGS = 0x0;
     for (i = 0; i < ARRAY_SIZE(opts); i++) {
        if (strstr(str, opts[i].name))
           MESA_DEBUG_FLAGS |= opts[i].flag;
     }
  #endif
  }
  
  
  /**
   * Initialize debugging variables from env vars.
   */
  void
  _mesa_init_debug( struct gl_context *ctx )
  {
     set_debug_flags(getenv("MESA_DEBUG"));
     set_verbose_flags(getenv("MESA_VERBOSE"));
  }
  
  
  /*
   * Write ppm file
   */
  static void
  write_ppm(const char *filename, const GLubyte *buffer, int width, int height,
            int comps, int rcomp, int gcomp, int bcomp, GLboolean invert)
  {
     FILE *f = fopen( filename, "w" );
     if (f) {
        int x, y;
        const GLubyte *ptr = buffer;
        fprintf(f,"P6\n");
        fprintf(f,"# ppm-file created by osdemo.c\n");
        fprintf(f,"%i %i\n", width,height);
        fprintf(f,"255\n");
        fclose(f);
        f = fopen( filename, "ab" );  /* reopen in binary append mode */
        if (!f) {
           fprintf(stderr, "Error while reopening %s in write_ppm()\n",
                   filename);
           return;
        }
        for (y=0; y < height; y++) {
           for (x = 0; x < width; x++) {
              int yy = invert ? (height - 1 - y) : y;
              int i = (yy * width + x) * comps;
              fputc(ptr[i+rcomp], f); /* write red */
              fputc(ptr[i+gcomp], f); /* write green */
              fputc(ptr[i+bcomp], f); /* write blue */
           }
        }
        fclose(f);
     }
     else {
        fprintf(stderr, "Unable to create %s in write_ppm()\n", filename);
     }
  }
  
  
  /**
   * Write a texture image to a ppm file.
   * \param face  cube face in [0,5]
   * \param level  mipmap level
   */
  static void
  write_texture_image(struct gl_texture_object *texObj,
                      GLuint face, GLuint level)
  {
     struct gl_texture_image *img = texObj->Image[face][level];
     if (img) {
        GET_CURRENT_CONTEXT(ctx);
        struct gl_pixelstore_attrib store;
        GLubyte *buffer;
        char s[100];
  
        buffer = malloc(img->Width * img->Height
                                          * img->Depth * 4);
  
        store = ctx->Pack; /* save */
        ctx->Pack = ctx->DefaultPacking;
  
        ctx->Driver.GetTexSubImage(ctx,
                                   0, 0, 0, img->Width, img->Height, img->Depth,
                                   GL_RGBA, GL_UNSIGNED_BYTE, buffer, img);
  
        /* make filename */
        snprintf(s, sizeof(s), "/tmp/tex%u.l%u.f%u.ppm", texObj->Name, level, face);
  
        printf("  Writing image level %u to %s\n", level, s);
        write_ppm(s, buffer, img->Width, img->Height, 4, 0, 1, 2, GL_FALSE);
  
        ctx->Pack = store; /* restore */
  
        free(buffer);
     }
  }
  
  
  /**
   * Write renderbuffer image to a ppm file.
   */
  void
  _mesa_write_renderbuffer_image(const struct gl_renderbuffer *rb)
  {
     GET_CURRENT_CONTEXT(ctx);
     GLubyte *buffer;
     char s[100];
     GLenum format, type;
  
     if (rb->_BaseFormat == GL_RGB ||
         rb->_BaseFormat == GL_RGBA) {
        format = GL_RGBA;
        type = GL_UNSIGNED_BYTE;
     }
     else if (rb->_BaseFormat == GL_DEPTH_STENCIL) {
        format = GL_DEPTH_STENCIL;
        type = GL_UNSIGNED_INT_24_8;
     }
     else {
        _mesa_debug(NULL,
                    "Unsupported BaseFormat 0x%x in "
                    "_mesa_write_renderbuffer_image()\n",
                    rb->_BaseFormat);
        return;
     }
  
     buffer = malloc(rb->Width * rb->Height * 4);
  
     ctx->Driver.ReadPixels(ctx, 0, 0, rb->Width, rb->Height,
                            format, type, &ctx->DefaultPacking, buffer);
  
     /* make filename */
     snprintf(s, sizeof(s), "/tmp/renderbuffer%u.ppm", rb->Name);
     snprintf(s, sizeof(s), "C:\\renderbuffer%u.ppm", rb->Name);
  
     printf("  Writing renderbuffer image to %s\n", s);
  
     _mesa_debug(NULL, "  Writing renderbuffer image to %s\n", s);
  
     write_ppm(s, buffer, rb->Width, rb->Height, 4, 0, 1, 2, GL_TRUE);
  
     free(buffer);
  }
  
  
  /** How many texture images (mipmap levels, faces) to write to files */
  #define WRITE_NONE 0
  #define WRITE_ONE  1
  #define WRITE_ALL  2
  
  static GLuint WriteImages;
  
  
  static void
  dump_texture(struct gl_texture_object *texObj, GLuint writeImages)
  {
     const GLuint numFaces = texObj->Target == GL_TEXTURE_CUBE_MAP ? 6 : 1;
     GLboolean written = GL_FALSE;
     GLuint i, j;
  
     printf("Texture %u\n", texObj->Name);
     printf("  Target %s\n", tex_target_name(texObj->Target));
     for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
        for (j = 0; j < numFaces; j++) {
           struct gl_texture_image *texImg = texObj->Image[j][i];
           if (texImg) {
              printf("  Face %u level %u: %d x %d x %d, format %s\n",
  		   j, i,
  		   texImg->Width, texImg->Height, texImg->Depth,
  		   _mesa_get_format_name(texImg->TexFormat));
              if (writeImages == WRITE_ALL ||
                  (writeImages == WRITE_ONE && !written)) {
                 write_texture_image(texObj, j, i);
                 written = GL_TRUE;
              }
           }
        }
     }
  }
  
  
  /**
   * Dump a single texture.
   */
  void
  _mesa_dump_texture(GLuint texture, GLuint writeImages)
  {
     GET_CURRENT_CONTEXT(ctx);
     struct gl_texture_object *texObj = _mesa_lookup_texture(ctx, texture);
     if (texObj) {
        dump_texture(texObj, writeImages);
     }
  }
  
  
  static void
  dump_texture_cb(void *data, UNUSED void *userData)
  {
     struct gl_texture_object *texObj = (struct gl_texture_object *) data;
     dump_texture(texObj, WriteImages);
  }
  
  
  /**
   * Print basic info about all texture objext to stdout.
   * If dumpImages is true, write PPM of level[0] image to a file.
   */
  void
  _mesa_dump_textures(GLuint writeImages)
  {
     GET_CURRENT_CONTEXT(ctx);
     WriteImages = writeImages;
     _mesa_HashWalk(ctx->Shared->TexObjects, dump_texture_cb, ctx);
  }
  
  
  static void
  dump_renderbuffer(const struct gl_renderbuffer *rb, GLboolean writeImage)
  {
     printf("Renderbuffer %u: %u x %u  IntFormat = %s\n",
  	  rb->Name, rb->Width, rb->Height,
  	  _mesa_enum_to_string(rb->InternalFormat));
     if (writeImage) {
        _mesa_write_renderbuffer_image(rb);
     }
  }
  
  
  static void
  dump_renderbuffer_cb(void *data, UNUSED void *userData)
  {
     const struct gl_renderbuffer *rb = (const struct gl_renderbuffer *) data;
     dump_renderbuffer(rb, WriteImages);
  }
  
  
  /**
   * Print basic info about all renderbuffers to stdout.
   * If dumpImages is true, write PPM of level[0] image to a file.
   */
  void
  _mesa_dump_renderbuffers(GLboolean writeImages)
  {
     GET_CURRENT_CONTEXT(ctx);
     WriteImages = writeImages;
     _mesa_HashWalk(ctx->Shared->RenderBuffers, dump_renderbuffer_cb, ctx);
  }
  
  
  
  void
  _mesa_dump_color_buffer(const char *filename)
  {
     GET_CURRENT_CONTEXT(ctx);
     const GLuint w = ctx->DrawBuffer->Width;
     const GLuint h = ctx->DrawBuffer->Height;
     GLubyte *buf;
  
     buf = malloc(w * h * 4);
  
     _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
     _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
     _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);
  
     _mesa_ReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, buf);
  
     printf("ReadBuffer %p 0x%x  DrawBuffer %p 0x%x\n",
  	  (void *) ctx->ReadBuffer->_ColorReadBuffer,
  	  ctx->ReadBuffer->ColorReadBuffer,
  	  (void *) ctx->DrawBuffer->_ColorDrawBuffers[0],
  	  ctx->DrawBuffer->ColorDrawBuffer[0]);
     printf("Writing %d x %d color buffer to %s\n", w, h, filename);
     write_ppm(filename, buf, w, h, 4, 0, 1, 2, GL_TRUE);
  
     _mesa_PopClientAttrib();
  
     free(buf);
  }
  
  
  void
  _mesa_dump_depth_buffer(const char *filename)
  {
     GET_CURRENT_CONTEXT(ctx);
     const GLuint w = ctx->DrawBuffer->Width;
     const GLuint h = ctx->DrawBuffer->Height;
     GLuint *buf;
     GLubyte *buf2;
     GLuint i;
  
     buf = malloc(w * h * 4);  /* 4 bpp */
     buf2 = malloc(w * h * 3); /* 3 bpp */
  
     _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
     _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
     _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);
  
     _mesa_ReadPixels(0, 0, w, h, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, buf);
  
     /* spread 24 bits of Z across R, G, B */
     for (i = 0; i < w * h; i++) {
        buf2[i*3+0] = (buf[i] >> 24) & 0xff;
        buf2[i*3+1] = (buf[i] >> 16) & 0xff;
        buf2[i*3+2] = (buf[i] >>  8) & 0xff;
     }
  
     printf("Writing %d x %d depth buffer to %s\n", w, h, filename);
     write_ppm(filename, buf2, w, h, 3, 0, 1, 2, GL_TRUE);
  
     _mesa_PopClientAttrib();
  
     free(buf);
     free(buf2);
  }
  
  
  void
  _mesa_dump_stencil_buffer(const char *filename)
  {
     GET_CURRENT_CONTEXT(ctx);
     const GLuint w = ctx->DrawBuffer->Width;
     const GLuint h = ctx->DrawBuffer->Height;
     GLubyte *buf;
     GLubyte *buf2;
     GLuint i;
  
     buf = malloc(w * h);  /* 1 bpp */
     buf2 = malloc(w * h * 3); /* 3 bpp */
  
     _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
     _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
     _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);
  
     _mesa_ReadPixels(0, 0, w, h, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, buf);
  
     for (i = 0; i < w * h; i++) {
        buf2[i*3+0] = buf[i];
        buf2[i*3+1] = (buf[i] & 127) * 2;
        buf2[i*3+2] = (buf[i] - 128) * 2;
     }
  
     printf("Writing %d x %d stencil buffer to %s\n", w, h, filename);
     write_ppm(filename, buf2, w, h, 3, 0, 1, 2, GL_TRUE);
  
     _mesa_PopClientAttrib();
  
     free(buf);
     free(buf2);
  }
  
  
  void
  _mesa_dump_image(const char *filename, const void *image, GLuint w, GLuint h,
                   GLenum format, GLenum type)
  {
     GLboolean invert = GL_TRUE;
  
     if (format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
        write_ppm(filename, image, w, h, 4, 0, 1, 2, invert);
     }
     else if (format == GL_BGRA && type == GL_UNSIGNED_BYTE) {
        write_ppm(filename, image, w, h, 4, 2, 1, 0, invert);
     }
     else if (format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE) {
        write_ppm(filename, image, w, h, 2, 1, 0, 0, invert);
     }
     else if (format == GL_RED && type == GL_UNSIGNED_BYTE) {
        write_ppm(filename, image, w, h, 1, 0, 0, 0, invert);
     }
     else if (format == GL_RGBA && type == GL_FLOAT) {
        /* convert floats to ubyte */
        GLubyte *buf = malloc(w * h * 4 * sizeof(GLubyte));
        const GLfloat *f = (const GLfloat *) image;
        GLuint i;
        for (i = 0; i < w * h * 4; i++) {
           UNCLAMPED_FLOAT_TO_UBYTE(buf[i], f[i]);
        }
        write_ppm(filename, buf, w, h, 4, 0, 1, 2, invert);
        free(buf);
     }
     else if (format == GL_RED && type == GL_FLOAT) {
        /* convert floats to ubyte */
        GLubyte *buf = malloc(w * h * sizeof(GLubyte));
        const GLfloat *f = (const GLfloat *) image;
        GLuint i;
        for (i = 0; i < w * h; i++) {
           UNCLAMPED_FLOAT_TO_UBYTE(buf[i], f[i]);
        }
        write_ppm(filename, buf, w, h, 1, 0, 0, 0, invert);
        free(buf);
     }
     else {
        _mesa_problem(NULL,
                   "Unsupported format 0x%x / type 0x%x in _mesa_dump_image()",
                   format, type);
     }
  }
  
  
  /**
   * Quick and dirty function to "print" a texture to stdout.
   */
  void
  _mesa_print_texture(struct gl_context *ctx, struct gl_texture_image *img)
  {
     const GLint slice = 0;
     GLint srcRowStride;
     GLuint i, j, c;
     GLubyte *data;
  
     ctx->Driver.MapTextureImage(ctx, img, slice,
                                 0, 0, img->Width, img->Height, GL_MAP_READ_BIT,
                                 &data, &srcRowStride);
  
     if (!data) {
        printf("No texture data\n");
     }
     else {
        /* XXX add more formats or make into a new format utility function */
        switch (img->TexFormat) {
           case MESA_FORMAT_A_UNORM8:
           case MESA_FORMAT_L_UNORM8:
           case MESA_FORMAT_I_UNORM8:
              c = 1;
              break;
           case MESA_FORMAT_LA_UNORM8:
              c = 2;
              break;
           case MESA_FORMAT_BGR_UNORM8:
           case MESA_FORMAT_RGB_UNORM8:
              c = 3;
              break;
           case MESA_FORMAT_A8B8G8R8_UNORM:
           case MESA_FORMAT_B8G8R8A8_UNORM:
              c = 4;
              break;
           default:
              _mesa_problem(NULL, "error in PrintTexture\n");
              return;
        }
  
        for (i = 0; i < img->Height; i++) {
           for (j = 0; j < img->Width; j++) {
              if (c==1)
                 printf("%02x  ", data[0]);
              else if (c==2)
                 printf("%02x%02x  ", data[0], data[1]);
              else if (c==3)
                 printf("%02x%02x%02x  ", data[0], data[1], data[2]);
              else if (c==4)
                 printf("%02x%02x%02x%02x  ", data[0], data[1], data[2], data[3]);
              data += (srcRowStride - img->Width) * c;
           }
           /* XXX use img->ImageStride here */
           printf("\n");
  
        }
     }
  
     ctx->Driver.UnmapTextureImage(ctx, img, slice);
  }
  